WorldWideScience

Sample records for anticorrosion coatings

  1. Anticorrosive coatings: a review

    DEFF Research Database (Denmark)

    Sørensen, Per Aggerholm; Kiil, Søren; Dam-Johansen, Kim

    2009-01-01

    The main objective of this review is to describe some of the important topics related to the use of marine and protective coatings for anticorrosive purposes. In this context, "protective" refers to coatings for containers, offshore constructions, wind turbines, storage tanks, bridges, rail cars......, and petrochemical plants while "marine" refers to coatings for ballast tanks, cargo holds and cargo tanks, decks, and engine rooms on ships. The review aims at providing a thorough picture of state-of-the-art in anticorrosive coatings systems. International and national legislation aiming at reducing the emission...... of volatile organic compounds (VOCs) have caused significant changes in the anticorrosive coating industry. The requirement for new VOC-compliant coating technologies means that coating manufacturers can no longer rely on the extensive track record of their time-served products to convince consumers...

  2. Self-Healing anticorrosive coatings

    DEFF Research Database (Denmark)

    Nesterova, Tatyana

    Self-healing anticorrosive coatings are multi-component so-called smart materials, which have been proposed as a way to long-lasting corrosion protection of steel structures. The presently most promising technology route is based on microcapsules, filled with active healing agents, and has been...... the focus of this work. The microcapsules consist of a solid polymeric shell and a liquid core material. When a microcrack, originating from internal stress or a physical damage, propagates through the coating, the microcapsules rupture and release healing agents, which flow to the fracture plane due...... to capillary forces. The healing agents then start to react, form a polymer network, and =glue‘ the crack. The approach has been applied to development of an epoxy-based self-healing anticorrosive coating for above water heavy duty corrosion protection. Emphasis has been on investigation of practical issues...

  3. Organic/inorganic hybrid coatings for anticorrosion

    Science.gov (United States)

    He, Zhouying

    Compared to organic coatings, organic-inorganic hybrid coatings can potentially improve the anticorrosion performance. The organic phase provides the excellent mechaincal and barrier properties while the inorganic phase acts as an adhesion promoter and corrosion inhibitor. Despite that many studies on alkoxylsilane-based hybrid coatings have been developed and studied, their weatherability and anticorrosion performance has been rarely evaluated. On the other hand, organic-inorganic hybrid coatings based on mixed sol-gel precursors have received much less attention compared to alkoxylsilane-based hybrid coatings. In the first part, polyurethane hybrid coatings with a unique hybrid crosslinked structure as an improved unicoat were successfully prepared. The effect of polyesters on physical properties of the hybrid coatings was studied. Polyurethane coatings derived from cycloaliphatic polyester show comparable properties than those derived from the commercially viable aromatic polyester. Introducing the polysiloxane part into the polyurethane coatings enhanced the crosslinking density, Tg, mechanical properties, and general coating properties. The increased adhesion between the hybrid coating and the substrate make the hybrid coating a good candidate for anticorrosion application, which is shown by electrochemical impedance spectroscopy (EIS). The degradation mechanism of the polyurethane/polysiloxane hybrid coatings under various weathering conditions was shown to be the scission of the urethane and ester groups in the organic phase along with reorganizing and rearranging of the inorganic phase. The anticorrosion performance of the cycloaliphatic hybrid was much better than that of aromatic based hybrid under outdoor weathering based on visual observation and EIS analysis. Acid undercutting is an issue for TEOS based hybrid coating. In the second part, design of experiments (DOEs) was used to statistically investigate on the effect of sol-gel precursors. The

  4. Ion sequestration particles for naval anticorrosion coatings

    Science.gov (United States)

    Zguris, Zachary Z.

    Corrosion is the electrochemical process of a metal returning to its lower energy state, the metal oxide. The cost of corrosion is difficult to estimate. One area particularly susceptible to corrosion problems with high maintenance costs is that of the 20,000 tanks existent in the US Naval Fleet. The Navy is sponsoring the development of novel coatings and additives that can be used to decrease the rising corrosion related costs. This dissertation describes in detail the synthesis of Ion Sequestration Particles (ISP) that when added to the standard MIL-DTL-24441 or potentially another coating system act to enhance the anticorrosion properties of the coating. A solid ion sequestration core material (SISCM) is first produced. The core is then encapsulated in a second stage forming a shell that protects the SISCM sufficiently from the harmful interactions with uncured epoxy based coatings. ISPs were designed to sequester harmful ions while releasing passivating ions in their place. The passivating ions then migrate to defect sites at the coating interface where they act to inhibit corrosion. The anticorrosion performance of ISPs in epoxy coatings has been demonstrated by both 500 hrs of hot deionized water immersion and 1000 hrs of salt spray exposure (ASTM B117). The best improvements in coating performance are attained with ISP content ranging from 5-10 wt % loading in a coating. ISPs were designed to limit the transport of harmful ions through the coating. However this work has determined high diffusion coefficients for ions (CI- and PO42-) through the epoxy matrix. Without ISPs, the diffusion coefficient through the MIL-DTL-24441 coating was determined for phosphate to be 1.16x10-7 cm2/s and for chloride to be in the range of 2.7x10-9 to 5.6x10-10 cm2/s. The addition of 5 wt % ISPs to the coating had the effect of decreasing the diffusion coefficient by an average of 25.5%. These results yield the conclusion that the enhanced anticorrosion properties of coatings

  5. Anticorrosive organic/inorganic hybrid coatings

    Science.gov (United States)

    Gao, Tongzhai

    Organic/inorganic hybrid coating system was developed for anticorrosion applications using polyurea, polyurethane or epoxide as the organic phase and polysiloxane, formed by sol-gel process, as the inorganic phase. Polyurea/polysiloxane hybrid coatings were formulated and moisture cured using HDI isocyanurate, alkoxysilane-functionalized HDI isocyanurate, and tetraethyl orthosilicate (TEOS) oligomers. Two urethanes were prepared using the same components as abovementioned in addition to the oligoesters derived from either cyclohexane diacids (CHDA) and 2-butyl-2-ethyl-1,3-propanediol (BEPD) or adipic acid (AA), isophthalic acid (IPA), 1,6-hexanediol (HD), and trimethylol propane (TMP). Accelerated weathering and outdoor exposure were performed to study the weatherability of the polyurethane/polysiloxane hybrid coating system. FTIR and solid-state 13C NMR revealed that the degradation of the hybrid coatings occurred at the urethane and ester functionalities of the organic phase. DMA and DSC analyses showed the glass transition temperature increased and broadened after weathering. SEM was employed to observe the change of morphology of the hybrid coatings and correlated with the gloss variation after weathering. Rutile TiO2 was formulated into polyurethane/polysiloxane hybrid coatings in order to investigate the effect of pigmentation on the coating properties and the sol-gel precursor. Chemical interaction between the TiO2 and the sol-gel precursor was investigated using solid-state 29Si NMR and XPS. The morphology, mechanical, viscoelastic, thermal properties of the pigmented coatings were evaluated as a function of pigmentation volume concentration (PVC). Using AFM and SEM, the pigment were observed to be well dispersed in the polymer matrix. The thermal stability, the tensile modulus and strength of the coatings were enhanced with increasing PVC, whereas the pull-off adhesion and flexibility were reduced with increasing PVC. Finally, the pigmented coatings were

  6. A New Type Anticorrosion Coating for Ocean Reinforced Concrete Structures

    Institute of Scientific and Technical Information of China (English)

    CHENG Qi; GENG Guisheng; LUO Feng; WU Sanyu; ZHAO Dalin

    2000-01-01

    Corrosion of reinforced concrete structures is a serious problem in ocean engineering. As an orientation of study, anticorrosion coating technique is developed and widely applied, but many problems need to be solved. LSW-2 type anticorrosion coating for maritime reinforced concrete structures is charac lerized by sea water resistance, salt fog resistance, moisture and heat resistance as well as impermeability to chlorions. The new type coating can be applied to wet concrete surface by conventional construction lechnique. It is a breakthrough in solving the above-mentioned problem. The paper mainly introduces the test results, the property indices, coating procedure, construction technique and economic benefit of the coating.

  7. Dodecylamine-loaded halloysite nanocontainers for active anticorrosion coatings

    Directory of Open Access Journals (Sweden)

    Jesus Marino Falcón

    2015-11-01

    Full Text Available Currently the most promising approach in the corrosion protection by smart coatings is the use of nanoreservoirs loaded with corrosion inhibitors. Nanocontainers are filled with anti-corrosive agents and embedded into a primer coating. Future prospective containers are halloysite nanotubes due to their low price, availability, durability, with high mechanical strength and biocompatibility. The aim of this work is to study the use of halloysite nanotubes as nanocontainers for encapsulated dodecylamine for active corrosion protection of carbon steel. Halloysite clay was characterized by XRD and TGA- thermogravimetric analysis techniques. Halloysite nanotubes were loaded with dodecylamine and embedded into an alkyd primer with a weight ratio of 10 wt.% . The anticorrosive performance of the alkyd primer doped with 10 wt.% of entrapped-dodecylamine halloysite was tested on coated carbon steel by direct exposure of the coated samples with a provoked defect into 0.01 mol/L NaCl corrosive media using electrochemical impedance spectroscopy (EIS and scanning vibrating electrode technique (SVET. EIS and SVET measurements showed the self-healing properties of the doped alkyd coating. Coated samples were also evaluated in a salt spray chamber and the self-healing effect was unequivocally noticed.

  8. Dodecylamine-loaded halloysite nanocontainers for active anticorrosion coatings

    Science.gov (United States)

    Falcón, Jesus; Sawczen, Tiago; Aoki, Idalina

    2015-11-01

    Currently the most promising approach in the corrosion protection by smart coatings is the use of nanoreservoirs loaded with corrosion inhibitors. Nanocontainers are filled with anti-corrosive agents and embedded into a primer coating. Future prospective containers are halloysite nanotubes due to their low price, availability, durability, with high mechanical strength and biocompatibility. The aim of this work is to study the use of halloysite nanotubes as nanocontainers for encapsulated dodecylamine for active corrosion protection of carbon steel. Halloysite clay was characterized by XRD and TGA- thermogravimetric analysis techniques. Halloysite nanotubes were loaded with dodecylamine and embedded into an alkyd primer with a weight ratio of 10 wt.% . The anticorrosive performance of the alkyd primer doped with 10 wt.% of entrapped-dodecylamine halloysite was tested on coated carbon steel by direct exposure of the coated samples with a provoked defect into 0.01 mol/L NaCl corrosive media using electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). EIS and SVET measurements showed the self-healing properties of the doped alkyd coating. Coated samples were also evaluated in a salt spray chamber and the self-healing effect was unequivocally noticed.

  9. Improving anti-corrosion property of thermal barrier coatings by intense pulsed ion beam irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Yan, S., E-mail: syan@pku.edu.cn [State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871 (China); Shang, Y.J., E-mail: shangyijun@pku.edu.cn [State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871 (China); Xu, X.F., E-mail: reandy123@126.com [State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871 (China); Yi, X., E-mail: xyle@buaa.edu.com [Department of Applied Physics, School of Science, Beihang University, Beijing 100083 (China); Le, X.Y., E-mail: xyle@buaa.edu.cn [Department of Applied Physics, School of Science, Beihang University, Beijing 100083 (China)

    2012-02-01

    Anticorrosion behavior is an important factor for the reliability and durability of thermal barrier coatings (TBCs). Intense pulsed ion beam (ion species: 70% H{sup +} + 30% C{sup +}; current density: 150 A/cm{sup 2} and 250 A/cm{sup 2}; accelerate voltage: 300 kV; pulse duration: 65 ns) irradiation were used to improve the anticorrosion behavior of the Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} (YSZ) /NiCoCrAlY thermal barrier coating. The anticorrosion property of the TBCs was evaluated with polarization curves method. A quite good result was obtained. Further analysis show that IPIB irradiation can seal the pores in YSZ layer, and block the penetration channels of corrosive fluid, therefore, improves the anticorrosion behavior.

  10. Development of Exterior Anti-corrosion Coating Production Line for Large Diameter Hot Bent Pipes

    Institute of Scientific and Technical Information of China (English)

    JiaoRuyi; ZhangYing

    2004-01-01

    The epoxy powder exterior anti-corrosion coating production line for bent pipes with a single (double) course production is a technologically advanced bent pipe anti-corrosion method with cost efficiency, environment friendliness and stable coating quality. The quality of the coating on the bent pipe fully meets the requirements of the current national and industrial standards. The application of the technology has filled the gap in the bent pipe anti-corrosion coating area of China, and leads the world technologically. With this technology the coating quality of the bent pipe has greatly improved, resulting in significant social and economic benefits. With the use of the technology in various large scale pipeline projects such as the “West to East Gas Pipeline Project”, it will exhibite a greater potential in the future pipeline projects with a broad application prospect.

  11. Research on the Anticorrosion Coating Under the Paved Layer for Highway Steel Box Bridge Deck

    Institute of Scientific and Technical Information of China (English)

    SHEN Cheng-jin; MING Tu-zhang; HU Guang-wei; OU Xue-mei; GEN Ou

    2006-01-01

    The corrosion of the anticorrosion coating and the defects of the asphalt concrete paved layer have been investigated on long-span steel box bridge decks. The anticorrosion coating lies in the middle of two entirely different materials: a highway steel box bridge deck and a paved layer, which is used as anticorrosion and waterproof coating for the steel bridge deck. For our study, electrochemical corrosion and pull strength experiments have been selected for the investigation of the corrosion properties of inorganic zinc rich coating, epoxy zinc rich coating and arc sprayed zinc coating. The adhesive strength between the coatings and the panel, and the effect of the coating corrosion on the shear properties of the paved layers including cast asphalt, thermal asphalt mortar, epoxy asphalt and modified asphalt concrete have been investigated. The results show that the adhesive strength between the coatings and the bridge panel is controlled by the method of pre-processing rust removal. Coating by sandblasting has stronger adhesive strength than coating by shot peening. The results also reveal that shear strength of the paved layer is affected by the corrosion product of zinc coating. The arc sprayed zinc coating has stronger shear strength than zinc rich coatings.

  12. Exopolysaccharides (EPS) as anti-corrosive additives for coatings

    NARCIS (Netherlands)

    Scheerder, J.; Breur, R.; Slaghek, T.; Holtman, W.; Vennik, M.; Ferrari, G.

    2012-01-01

    Exopolysaccharides (EPS) are a class of renewable polymers that show interesting anti-corrosive properties and could potentially be used as an alternative for zinc phosphates. When combined with a waterborne styrene-acrylic polymer dispersion (SA-1), exopolysaccharides were shown to give an improvem

  13. Bonding strength of graded anti-corrosive coatings of fluoroethylenepropylene (FEP)/polyphenylene sulfide (PPS)

    Institute of Scientific and Technical Information of China (English)

    Jie Bian; Weiqiang Wang; Congsheng Guan; Yonghui Zhao

    2005-01-01

    Fluororesin-based anti-corrosive coatings including graded FEP/PPS were prepared on carbon steel by melt powder coating, the bonding strength of all coating systems was determined by the pull-off test. It is found that the poor adhesion of fluororesin coatings to metallic substrates is improved obviously by the graded coating structure of FEP/PPS, and the bonding strength reaches up to 11.8 MPa for the five-layer system. Examination by electron probe microanalysis (EPMA) verifies that the distribution of main components is graded in the five-layer system, which is responsible for the enhancement of the interfacial bonding.

  14. Microcapsule-based self-healing anticorrosive coatings: Capsule size, coating formulation, and exposure testing

    DEFF Research Database (Denmark)

    Nesterova, Tatyana; Dam-Johansen, Kim; Pedersen, Lars Thorslund

    2012-01-01

    Self-healing coatings is a rapidly growing research area, where focus has mainly been on development of new approaches to the mechanism of self-healing. However, there is a growing need for investigation of practical issues related to formulation, application, and testing of true self-healing coa......Self-healing coatings is a rapidly growing research area, where focus has mainly been on development of new approaches to the mechanism of self-healing. However, there is a growing need for investigation of practical issues related to formulation, application, and testing of true self......-healing coatings. In this work, ways of reducing the size of poly(urea–formaldehyde) microcapsules, filled with linseed oil and intended for a microcapsule-based self-healing anticorrosive coating (above water exposure), are explored. The influence of microcapsules on epoxy coating performance is also studied...... a decrease in microcapsule size but were accompanied by excessive formation of nanoparticles. Thus, isolation of too large microcapsules has been performed by filtration utilizing a novel low-energy fluoropolymer-coated steel sieve. An estimation of the critical pigment (microcapsule) volume concentration...

  15. Anticorrosive coatings for storage tanks; Revestimentos anticorrosivos para tanques de armazenamento de petroquimicos

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Jeferson de [Coordenacao dos Programas de Pos-graduacao em Engenharia (COPPE/UFRJ), RJ (Brazil). Lab. de Ensaios Nao Destrutivos, Corrosao e Soldagem; Silva, Cosmelina G. da; Mattos, Oscar R. [Coordenacao dos Programas de Pos-graduacao em Engenharia (COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Metalurgica e de Materiais; Margarit-Mattos, Isabel C.P. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Escola de Quimica. Dept. de Processos Inorganicos; Solymossy, Victor; Quintela, Joaquim P. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2008-07-01

    The anticorrosive performance of commercial coatings that can be employed inside petrochemical storing reservoirs was evaluated. The aim is to select products able to extend the time between maintenance. Some of the products tested are composites and formulas with novolac resins. The tests were: cathodic delamination and total immersion in distilled water at 40 deg C, formation water at 80 deg C, NaOH 20%, H{sub 2}SO{sub 4} 20%, MIBK, ethanol and naphtha. The performance evaluation took into account the presence of corrosion, blistering, adhesion loss and electrochemical properties. Based on the results, considerations are made about the adequacy of tests and procedures for the new generations of organic anticorrosive coatings. (author)

  16. Effect of Nano Al Pigment on the Anticorrosive Performance of Waterborne Epoxy Coatings

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    This paper presents the results regarding the effect of nano aluminum powder pigment concentration on the protective properties of waterborne epoxy films in 3.5 wt pct NaCl solution. The anticorrosive performance of the coatings with 0.5, 1, and 3 wt pct pigments and none pigment were investigated using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and Raman spectroscopy techniques.The results show that adding appropriate amount of nano-aluminium powder pigment can enhance the barrier properties of the epoxy coating, which is attributed to the surface effect of nanoparticles and the compatibility of the pigment with the waterborne epoxy coatings.

  17. Study of Polyaniline/Vermiculie/Tert-fluoro Emulsion Composites Anticorrosion Coatings

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    1 Results Polyaniline (PANI) is one of the most promising materials for commercial applications.It can be applied to electronic devices and products such as light-emitting diodes,organic FETs,EMI shielding,secondary batteries,etc.Composites of polyaniline with other polymers or inorganic materials can provide new synergistic properties that cannot be attained from individual materials.Vermiculite (VMT) is a chain-layer magnesium-aluminum silicate mineral.We prepared composite anticorrosion coatings of p...

  18. Layer-by-Layer Assembly of a Self-Healing Anticorrosion Coating on Magnesium Alloys.

    Science.gov (United States)

    Fan, Fan; Zhou, Chunyu; Wang, Xu; Szpunar, Jerzy

    2015-12-16

    Fabrication of self-healing anticorrosion coatings has attracted attention as it has the ability to extend the service life and prevent the substrate from corrosive attack. However, a coating system with a rapid self-healing ability and an improved corrosion resistance is rarely reported. In this work, we developed a self-healing anticorrosion coating on a magnesium alloy (AZ31). The coating comprises a cerium-based conversion layer, a graphene oxide layer, and a branched poly(ethylene imine) (PEI)/poly(acrylic acid) (PAA) multilayer. We incorporated the graphene oxide as corrosion inhibitors and used the PEI/PAA multilayers to provide the self-healing ability to the coating systems. X-ray diffraction (XRD) and Raman spectroscopy were used to characterize the composition of the multilayers, and scanning electron microscopy (SEM) was used to analyze the surface morphology. The electrochemical impedance spectroscopy (EIS) results illustrate the improved corrosion resistance of the coating. The proposed coating also has a rapid self-healing ability in the presence of water.

  19. An intelligent anticorrosion coating based on pH-responsive supramolecular nanocontainers

    Science.gov (United States)

    Chen, Tao; Fu, JiaJun

    2012-12-01

    The hollow mesoporous silica nanoparticles (HMSNs), which have been used as the nanocontainers for the corrosion inhibitor, benzotriazole, were fabricated using the hard-template method. Alkaline-responsive HMSNs based on cucurbit[6]uril (CB[6])/bisammonium supramolecular complex and acid-responsive HMSNs based on α-cyclodextrin (α-CD)/aniline supramolecular complex, which operate in water, have been achieved and characterized by solid-state NMR, thermogravimetry analysis, scanning electron microscopy, transmission electron microscopy and N2 adsorption-desorption analysis. The two elaborately designed nanocontainers show the pH-controlled encapsulation/release behaviors for benzotriazole molecules. Equal amounts of the alkaline- and acid-responsive nanocontainers were uniformly distributed in the hybrid zirconia-silica sol-gel coating and thus formed the intelligent anticorrosion coating. The self-healing property of AA2024 alloy coated with the intelligent anticorrosion coating is evaluated by electrochemical impedance spectroscopy (EIS). The sol-gel coating doped with the pH-responsive nanocontainers clearly demonstrates long-term corrosion protection performances when compared to the undoped sol-gel coating, which is attributed to the release of corrosion inhibitor from the nanocontainers after feeling the changes of environmental pH values near the corroded areas.

  20. Anticorrosion performance of the coating/metal system by electrochemical impedance spectra

    Institute of Scientific and Technical Information of China (English)

    Yinghuai Zhang; Lining Xu; Minxu Lu; Pu Zhang

    2008-01-01

    In order to investigate the anticorrosion performance of the organic coating/metal system, electrochemical impedance spectra (EIS) were measured in the 3.5wt% NaC1 solution, the chemical component and the formation of corrosion products scale were analyzed by laser Raman microspectroscopy, and the pattern of the organic coating/metal system was observed by scanning electron microscopy (SEM). The characteristics and the delamination process of the organic coating/metal system were investigated systematically, and the emphases were on the transportation of the corrosive medium and the changes of the coating/metal interface. The results show that the impedance decreases at the initial immersion, then increases at the middle-immersion, and again decreases at last, which is related to the corrosion products scale. The concentration of Cl-in the coating, which destroys the corrosion products scale, increases with the immersion time.

  1. Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

    DEFF Research Database (Denmark)

    Sørensen, Per Aggerholm; Weinell, C. E.; Dam-Johansen, Kim

    2010-01-01

    Cathodic delamination is one of the major modes of failure for anticorrosive coatings subjected to a physical damage and immersed in seawater. The cause of cathodic delamination has been reported to be the result of a chemical attack at the coating-steel interface by free radicals and peroxides...... formed as intermediates in the cathodic reaction during the corrosion process. In this study, antioxidants (i.e., free radical scavengers and peroxide decomposers) have been incorporated into various generic types of coatings to investigate the effect of antioxidants on the rate of cathodic delamination...... of epoxy coatings on cold rolled steel. The addition of cathodic delamination by up to 50% during seawater immersion, while peroxide decomposers had a limited effect. Testing using substrates prepared from stainless steel...

  2. Anticorrosive Performance of Zinc Phosphate Coatings on Mild Steel Developed Using Galvanic Coupling

    Directory of Open Access Journals (Sweden)

    M. Arthanareeswari

    2013-01-01

    Full Text Available The anticorrosive performance of zinc phosphate coatings developed by galvanic coupling technique on mild steel substrates using the cathode materials such as titanium (Ti, copper (Cu, brass (BR, nickel (Ni, and stainless steel (SS is elucidated in this study. Thermal and chemical stability tests, immersion test in 3.5% NaCl, ARE salt droplet test, and salt spray test were carried out. The study reveals that the mild steel substrates phosphated under galvanically coupled condition showed better corrosion resistance than the one coated without coupling. The open circuit potential (OCP of phosphated mild steel panels in 3.5% NaCl was found to be a function of phosphate coating weight and porosity of the coating.

  3. Effect of pretreating technologies on the adhesive strength and anticorrosion property of Zn coated NdFeB specimens

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Pengjie [School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China); Earth-Panda Advance Magnetic Material Co. Ltd., Hefei (China); Anhui Province Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei (China); State Key Laboratory of Rare Earth Permanent Magnet Materials (Earth-Panda Advance Magnetic Material Co., Ltd.), Hefei (China); Xu, Guangqing, E-mail: gqxu1979@hfut.edu.cn [School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China); Liu, Jiaqin [School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China); Yi, Xiaofei [School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China); Earth-Panda Advance Magnetic Material Co. Ltd., Hefei (China); Anhui Province Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei (China); State Key Laboratory of Rare Earth Permanent Magnet Materials (Earth-Panda Advance Magnetic Material Co., Ltd.), Hefei (China); Wu, Yucheng, E-mail: ycwu@hfut.edu.cn [School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China); Chen, JingWu [Earth-Panda Advance Magnetic Material Co. Ltd., Hefei (China); Anhui Province Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei (China); State Key Laboratory of Rare Earth Permanent Magnet Materials (Earth-Panda Advance Magnetic Material Co., Ltd.), Hefei (China)

    2016-02-15

    Graphical abstract: Zn coated NdFeB specimens pretreated with different technologies possess different adhesive strengths and anticorrosion properties. And the combined technology of sandblasting and pickling (5 s) achieves the best comprehensive performance. - Highlights: • Zn coated NdFeB specimens are achieved with different pretreating technologies. • Combined technology possesses the highest adhesive strength. • Combined technology possesses excellent anticorrosion property. - Abstract: Zinc coated NdFeB specimens were prepared with different pretreating technologies, such as polishing, pickling (50 s), sandblasting and combined technology of sandblasting and pickling (5 s). Morphologies of the NdFeB substrates pretreated with different technologies were observed with a scanning electron microscope equipped with an energy dispersive spectrometer and an atomic force microscope. The tensile test was performed to measure the adhesive strength between Zn coating and NdFeB substrate. The self-corrosion behavior of the NdFeB specimen was characterized by potentiodynamic polarization curve. The anticorrosion properties of Zn coated NdFeB specimens were characterized by neutral salt spray tests. The pretreating technologies possess obvious impact on the adhesive strength and anticorrosion property of Zn coated NdFeB specimens. Combined pretreating technology of sandblasting and pickling (5 s) achieves the highest adhesive strength (25.56 MPa) and excellent anticorrosion property (average corrosion current density of 21 μA/cm{sup 2}) in the four pretreating technologies. The impacting mechanisms of the pretreating technology on the adhesive strength and anticorrosion properties are deeply discussed.

  4. Influence of substrate topography on cathodic delamination of anticorrosive coatings

    DEFF Research Database (Denmark)

    Sørensen, Per Aggerholm; Kiil, Søren; Dam-Johansen, Kim

    2009-01-01

    The cathodic delamination of a commercial magnesium silicate and titanium dioxide pigmented epoxy coating on abrasive cleaned cold rolled steel has been investigated. The rate of delamination was found to depend on interfacial transport from the artificial defect to the delamination front...... and thereby the substrate topography, whereas the coating thickness had little influence. The presence of a significant potential gradient between the anode and the cathode and the dependency of the delamination rate on the tortuosity of the steel surface suggests that cathodic delamination is controlled...... by migration of cations from the defect to the delamination front. This means that abrasive blasting, to some extent, can be applied to control and minimize the observed rate of cathodic delamination. The lifetime of the species causing disbondment suggested that sodium hydroxide or potassium hydroxide...

  5. Compatibility between pipeline anti-corrosion coating and thermal insulator in the presence of cathodic protection

    Energy Technology Data Exchange (ETDEWEB)

    Papavinasam, S.; Doiron, A.

    2008-09-15

    Standard tests were conducted to evaluate and qualify materials used for the development of oil and gas pipeline insulators operating at elevated temperatures. The aim of the study was to demonstrate the efficacy of a modified cathodic disbondment methodology for evaluating the compatibility between anti-corrosion coatings and insulators in the presence of cathodic protection (CP). The surface of the coated panels were maintained at an external surface temperature of a pipeline operating at an internal temperature of 150 degrees C. The panels were also isolated from each other as well as from the heated pipes to ensure that the cathodic disbondment tests could be conducted simultaneously. Chemical and electrochemical changes were monitored using pH, electrochemical quartz crystal microbalance (EQCM) and electrochemical impedance spectroscopy (EIS). Samples with anti-corrosion coatings and insulators of varying thickness were tested with and without an outer polyethylene jacket. Results of the tests will be presented to industry stakeholders in order to obtain further feedback. 9 refs., 1 tab., 4 appendices.

  6. Technology of Anticorrosive Protection of Steel Constructions by Coatings Based on Rapid-Hardening Bitumen-Latex Emulsion

    Directory of Open Access Journals (Sweden)

    Nykyforchyn, H.M.

    2016-01-01

    Full Text Available The recipes of rapid-hardening bitumen-latex emulsions and coatings on its base are created, in-laboratory tests of their physical, chemical and anticorrosive properties are carried out. The technology of anticorrosive protection and the installation technical documentation for making of aqueous bitumen-latex emulsion is developed, installation is mounted and a pilot lot of rapid-hardening emulsion is produced. Experimental-industrial approbation of the technology of coating formation on pipes in oil and gas industry is carried out.

  7. UV-curable nanocasting technique to prepare bioinspired superhydrophobic organic-inorganic composite anticorrosion coatings

    Directory of Open Access Journals (Sweden)

    K. C. Chang

    2015-02-01

    Full Text Available A UV-curing technique was used to develop advanced anticorrosive coatings made of a poly(methyl methacrylate (PMMA/silica composite (PSC with bioinspired Xanthosoma sagittifolium leaf-like superhydrophobic surfaces. First of all, a transparent soft template with negative patterns of xanthosoma sagittifolium leaf can be fabricated by thermally curing the polydimethylsiloxane (PDMS pre-polymer in molds at 60°C for 4 h, followed by detaching PDMS template from the surface of natural leaf. PSC coatings with biomimetic structures can be prepared by performing the UV-radiation process upon casting UV-curable precursor with photo-initiator onto cold-rolled steel (CRS electrode under PDMS template. Subsequently, UV-radiation process was carried out by using light source with light intensity of 100 mW/cm2 with exposing wavelength of 365 nm. Surface morphologies of the as-synthesized hydrophobic PMMA (HP and superhydrophobic PSC (SPSC coatings showed a large number of micro-scaled mastoids, each decorated with many nano-scaled wrinkles that were systematically investigated by using scanning electron microscopy (SEM. The contact angles of water droplets on the sample surfaces can be increased from ~81 and 103° on PMMA and PSC surfaces to ~148 and 163° on HP and SPSC surfaces, respectively. The SPSC coating was found to provide an advanced corrosion protection effect on CRS electrodes compared to that of neat PMMA, PSC, and HP coatings based on a series of electrochemical corrosion measurements in 3.5 wt% NaCl electrolyte. Enhanced corrosion protection of SPSC coatings on CRS electrodes can be illustrated by that the silica nanoparticles on the small papillary hills of the bioinspired structure of the surface further increased the surface roughness, making the surface exhibit superior superhydrophobic, and thus leading to much better anticorrosion performance.

  8. Laser ablation and competitive technologies in paint stripping of heavy anticorrosion coatings

    Science.gov (United States)

    Schuöcker, Georg D.; Bielak, Robert

    2007-05-01

    During the last years surface preparation prior to coating operations became an important research and development task, since tightened environmental regulations have to be faced in view of the deliberation of hazardous compounds of coatings. Especially, ship-yards get more and more under pressure, because the environmental commitment of their Asian competitors is fairly limited. Therefore, in the US and in Europe several technology evaluation projects have been launched to face this challenge. The majority of coating service providers and ship yards use grit blasting; this process causes heavy emissions as of dust and enormous amounts of waste as polluted sand. Coating removal without any blasting material would reduce the environmental impact. Laser processing offers ecological advantages. Therefore thermal processes like laser ablation have been studied thoroughly in several published projects and also in this study. Many of these studies have been focused on the maintenance of airplanes, but not on de-coating of heavy protective coatings. In this case the required laser power is extra-high. This study is focused on the maintenance of heavy anti-corrosion coatings and compares the industrial requirements and the opportunities of the innovative laser processes. Based on the results of this analysis similar approaches as e.g. plasma jet coating ablation have been studied. It was concluded that none of these methods can compete economically with the conventional processes as grit blasting and water jetting since the required ablation rate is very high (>60m2/h). A new process is required that is not based on any blasting operation and which does not depend strongly on the coating's characteristic. The delamination of the coating where the coatings is not removed by evaporation, but in little pieces of the complete coating system meets these requirements. The delamination can be accomplished by the thermal destruction of the primer coating by an intense heat pulse

  9. Preparation technology and anti-corrosion performances of black ceramic coatings formed by micro-arc oxidation on aluminum alloys

    Institute of Scientific and Technical Information of China (English)

    CHEN Ling; HAN Jing; YU Shengxue

    2006-01-01

    In order to prepare ornamental and anti-corrosive coating on aluminum alloys, preparation technology of black micro-arc ceramic coatings on Al alloys in silicate based electrolyte was studied.The influence of content of Na2WO4 and combination additive in solution on the performance of black ceramic coatings was studied; the anticorrosion performances of black ceramic coatings were evaluated through whole-immersion test and electrochemical method in 3.5% NaCl solution at different pH value; SEM and XRD were used to analyze the surface morphology and phase constitutes of the black ceramic coatings.Experimental results indicated that, without combination additives, with the increasing of Na2WO4 content in the electrolyte, ceramic coating became darker and thicker, but the color was not black; after adding combination additive, the coating turned to be black; the black ceramic coating was multi-hole form in surface.There was a small quantity of tungsten existing in the black ceramic coating beside α-Al2O3 phase and β-Al2O3 phase.And aluminum alloy with black ceramic coating exhibited excellent anti-corrosion property in acid, basic and neutral 3.5% NaCl solution.

  10. Fabrication and Assessment of Crumb-Rubber-Modified Coatings with Anticorrosive Properties

    Directory of Open Access Journals (Sweden)

    Nasser Al-Aqeeli

    2015-01-01

    Full Text Available Scrap tires continue to be a major source of waste due to the lack of valuable and effective disposal routes. A viable solution to this problem is to recycle crumb rubber (CR—a granulated material derived from scrap tires—and use it to develop other valuable products. Herein we report the fabrication and characterization of CR-modified coatings with anticorrosive properties on metal substrates. By varying the particle size and concentration of CR, we have determined the coating composition that offers the highest level of erosion protection. Images from a scanning electron microscope (SEM reveal that CR is homogenously dispersed in the coating, especially when fine particles are used. As the concentration of CR increases, the hardness of the coating decreases as a result of the elastic properties of CR. More importantly, the erosion rate of the coating decreases due to increased ductility. Following Potentiodynamic tests, the utilization of these coatings proved to be beneficial as they showed good protection against aqueous corrosion when tested in 0.5 M NaCl solution. Our newly developed coatings offer an incentive to recycling CR and open up a safe and sustainable route to the disposal of scrap tires.

  11. Mechanical and anticorrosion properties of nanosilica-filled epoxy-resin composite coatings

    Science.gov (United States)

    Conradi, M.; Kocijan, A.; Kek-Merl, D.; Zorko, M.; Verpoest, I.

    2014-02-01

    Homogeneous, 50-μm-thick, epoxy coatings and composite epoxy coatings containing 2 wt% of 130-nm silica particles were successfully synthetized on austenitic stainless steel of the type AISI 316L. The surface morphology and mechanical properties of these coatings were compared and characterized using a profilometer, defining the average surface roughness and the Vickers hardness, respectively. The effects of incorporating the silica particles on the surface characteristics and the corrosion resistance of the epoxy-coated steel were additionally investigated with contact-angle measurements as well as by potentiodynamic polarization and electrochemical impedance spectroscopy in a 3.5 wt% NaCl solution. The silica particles were found to significantly improve the microstructure of the coating matrix, which was reflected in an increased hardness, increased surface roughness and induced hydrophobicity. Finally, the silica/epoxy coating was proven to serve as a successful barrier in a chloride-ion-rich environment with an enhanced anticorrosive performance, which was confirmed by the reduced corrosion rate and the increased coating resistance due to zigzagging of the diffusion path available to the ionic species.

  12. Anticorrosive Properties of Poly(o-phenylenediamine/ZnO Nanocomposites Coated Stainless Steel

    Directory of Open Access Journals (Sweden)

    Aisha Ganash

    2014-01-01

    Full Text Available Poly(o-phenylenediamine and poly(o-phenylenediamine/ZnO (PoPd/ZnO nanocomposites coating were prepared on type-304 austenitic stainless steel (SS using H2SO4 acid as electrolyte by potentiostatic methods. Fourier transforms infrared spectroscopy and scanning electron microscopy techniques were used to characterize the composition and structure of PoPd/ZnO nanocomposites. The corrosion protection of polymer coatings ability was studied by Eocp-time measurement, anodic and cathodic potentiodynamic polarization and impedance techniques in 3.5% NaCl as corrosive solution. It was found that ZnO nanoparticles improve the barrier and electrochemical anticorrosive properties of poly(o-phenylenediamine.

  13. New Anti-Corrosive Coatings with Resin-Bonded Polyaniline and Related Electroactive Groups

    Science.gov (United States)

    Weil, Edward D.

    1997-01-01

    It is already known that polyaniline (an electroactive polymer) functions as a corrosion inhibitor for steel and in view of the fact that it is known to perform in the presence of hydrochloric acid, it has been considered likely that it may be useful to NASA for protecting launch structures at KSC which are exposed to not only continual ocean-side salt spray but also to hydrochloric acid at the times that solid-fuel boosters are fired. The currently used zinc-rich silicate-bonded coating is not wholly protective against the hydrochloric acid. Water pollution from zinc salts is another concern. Other earlier and concurrent NASA sponsored projects have been focussed on polyaniline specifically. Our project, administered for NASA by Dr. K. Thompson of KSC and these more-specifically polyaniline-related projects are included in a CRADA coordinated by Dr. F. Via of Akzo Nobel. A parallel project at Polytechnic under Prof K. Levon concentrated more specifically on polyaniline with various dopants. Our exploratory project reported herein was aimed at broadening the range of such corrosion inhibitors, to give protective paint compounders a wider latitude for adding corrosion inhibitors having polyaniline-like performance, and thus we diverged in several probing directions from polyaniline. Our working hypothesis was that physical variants of polyaniline, such as supported formulations on pigments or carriers, and chemical variants of polyaniline, including those having no electroconductive character, may have enhanced anticorrosion activity. We also hypothesized that small (non-polymeric) molecules having structures related to those occurring in polyaniline, may be active as corrosion inhibitors. We did preliminary testing, using an ASTM salt spray method at a nearby commercial paint testing laboratory. Our most interesting findings were that a non-electroconductive meta-isomer of polyaniline showed some corrosion activity, suggesting that the features of the polyaniline

  14. Influence of Functionalization of Nanocontainers on Self-Healing Anticorrosive Coatings.

    Science.gov (United States)

    Zheng, Zhaoliang; Schenderlein, Matthias; Huang, Xing; Brownbill, Nick J; Blanc, Frédéric; Shchukin, Dmitry

    2015-10-21

    Feedback coating based on pH-induced release of inhibitor from organosilyl-functionalized containers is considered as a compelling candidate to achieve smart self-healing corrosion protection. Four key factors that determine the overall coating performance include (1) the uptake and release capacity of containers, (2) prevention of the premature leakage, (3) compatibility of containers in coating matrix, and (4) cost and procedure simplicity consideration. The critical influence introduced by organosilyl-functionalization of containers is systematically demonstrated by investigating MCM-41 silica nanoparticles modified with ethylenediamine (en), en-4-oxobutanoic acid salt (en-COO(-)), and en-triacetate (en-(COO(-))3) with higher and lower organic contents. The properties of the modified silica nanoparticles as containers were mainly characterized by solid-state (13)C nuclear magnetic resonance, scanning and transmission electron microscopy, N2 sorption, thermogravimetric analysis, small-angle X-ray scattering, dynamic light scattering, and UV-vis spectroscopy. Finally, the self-healing ability and anticorrosive performances of hybrid coatings were examined through scanning vibrating electrode technique (SVET) and electrochemical impedance spectroscopy (EIS). We found that en-(COO(-))3-type functionalization with content of only 0.23 mmol/g performed the best as a candidate for establishing pH-induced release system because the resulting capped and loaded (C-L) functionalized silica nanocontainers (FSNs) exhibit high loading (26 wt %) and release (80%) capacities for inhibitor, prevention of premature leakage (less than 2%), good dispersibility in coating matrix, and cost effectiveness.

  15. Advanced Anticorrosion Coating Materials Derived from Sunflower Oil with Bifunctional Properties.

    Science.gov (United States)

    Balakrishnan, Thiruparasakthi; Sathiyanarayanan, Sadagopan; Mayavan, Sundar

    2015-09-09

    High-performance barrier films preventing permeation of moisture, aggressive chloride ions, and corrosive acids are important for many industries ranging from food to aviation. In the current study, pristine sunflower oil was used to form uniform adherent films on iron (Fe) via a simple single-step thermal treatment (without involving any initiator/mediator/catalyst). Oxidation of oil on heating results in a highly conjugated (oxidized) crystalline lamellar network with interlayer separation of 0.445 nm on Fe. The electrochemical corrosion tests proved that the coating exhibits superior anticorrosion performance with high coating resistance (>10(9) ohm cm2) and low capacitance values (<10(-10) F cm(-2)) as compared to bare Fe, graphene, and conducting polymer based coatings in 1 M hydrochloric acid solutions. The electrochemical analyses reveal that the oil coatings developed in this study provided a two-fold protection of passivation from the oxide layer and barrier from polymeric films. It is clearly observed that there is no change in structure, morphology, or electrochemical properties even after a prolonged exposure time of 80 days. This work indicates the prospect of developing highly inert, environmentally green, nontoxic, and micrometer level passivating barrier coatings from more sustainable and renewable sources, which can be of interest for numerous applications.

  16. Long-Term Anti-Corrosion Performance of a Conducting Polymer-Based Coating System for Steels

    Science.gov (United States)

    Pan, Tongyan; Yu, Qifeng

    2016-06-01

    The long-term durability of a two-layer coating system was evaluated by two accelerated corrosion tests, i.e., the ASTM B117 Salt spray test and the ASTM D5894 Cyclic salt fog/UV exposure test, and a series of surface analyses. The coating system was developed for protecting structural steels from corrosion, including a functional primer made of intrinsically conducting polymer (ICP) and a protective topcoat. The standard pull-off test per ASTM D4541 was employed for characterizing the adhesion of the coating systems to substrate, aided by visual examination of the surface deterioration of the samples. The ICP-based systems demonstrated superior long-term anti-corrosion capacity when a polyurethane topcoat is used. The ICP-based primer made of a waterborne epoxy gave poorer anti-corrosion performance than the ICP-based primer made of regular non-waterborne epoxy, which can be attributed to the lower adhesion the waterborne epoxy demonstrated to the substrate surface. The zinc-rich control systems showed good anti-corrosion durability; however, they may produce excessive oxidative products of zinc to cause coating delamination. Based on the test results, the two-layer coating system consisting of an ICP-based primer and a polyurethane topcoat outperforms the conventional zinc-rich coating systems for corrosion protection of steels.

  17. Evaluation of anti-corrosive lubricating behavior of dicationic ionic liquid coatings for biomedical alloys

    Science.gov (United States)

    Siddiqui, Danyal Alam

    Since their inception, orthopedic implants composed of biomedical alloys have been plagued with failures associated with corrosion and wear processes. Despite current surface treatments and techniques being employed to mitigate corrosion and wear, these failure mechanisms continue to occur as prevalent failure modes. Recently, a novel class of compounds known as ionic liquids has been proposed as a multi-functional coating to protect the surfaces of commercially pure titanium surfaces comprising dental implants. In this study, the goal was to evaluate select formulations of these ionic liquids to serve as anti-corrosive lubricants for titanium and cobalt chromium molybdenum alloys widely used in orthopedic implants. Electrochemical and tribological testing of dicationic imidazolium-based ionic liquids revealed these compounds to be superior candidates as corrosion inhibitors and lubricants of biomedical alloy surfaces.

  18. Anti-corrosion mechanism of epoxy-resin and different content Fe2O3 coatings on magnesium alloy

    Science.gov (United States)

    Jin, Tao; Kong, Fan-mei; Bai, Rui-qin; Zhang, Ru-liang

    2016-10-01

    In this study, anti-corrosion coatings were prepared and coated successfully on magnesium alloy substrates by mixing nanopowders, solvent, curing agent with epoxy resin. The effect of the amount of iron trioxide (Fe2O3) on the adhesion strength and corrosion resistance on magnesium alloy was investigated with standard protocols, and electrochemical measurements were also made in 3.5 wt.% NaCl solutions. The surface morphology and corrosion mechanism after corrosion tests was characterized using FESEM analysis. Nanoparticles in matrix acted as filler, and interstitial cross-linked spaces and other coating artifacts regions (micro cracks and voids) would all affect the anti-corrosion properties of coating. The results showed the proper powder content not only provided adhesion strength to these coatings but also improved obviously their anticorrosion. Hydrogen bound to the amine nitrogen (1N) could take part in the curing process rather than hydrogen of the amide site due to the smaller ΔG and the more stable configuration.

  19. Anticorrosive field joint coating qualification, heat shrinkable sleeve; Qualificacao de revestimento anticorrosivo para juntas de campo, mantas termocontrateis

    Energy Technology Data Exchange (ETDEWEB)

    Cabral, Glaucia B.; Koebsch, Andre; Castinheiras Junior, Wilson [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2005-07-01

    The main objective of this job is to present the quality requirements fixed by PETROBRAS for anticorrosive field joint coating for buried pipelines, industrially coated with PE-3L. It describes the used system - polyethylene based heat shrinkable sleeve - comparing with the existent on the pipeline. So, it exposes the suppliers' qualification stages, which include test carried out for the materials, for the sleeve set and for the coating after its application on the joint field. Finally, it shows that the experience, which has been gotten in the qualification, consolidated the quality control systematic that have been carry out during the sleeves acquisition and application at the pipeline construction. (author)

  20. Epoxy coatings for anticorrosion challenges: a link between chemistry and performance?

    Energy Technology Data Exchange (ETDEWEB)

    Sauvant-Moynot, Valerie; Schweitzer, Sylvie; Grenier, Jacky; Duval, Sebastien [Institut Francais du Petrole, 1 et 4 avenue Bois Preau, 92450 Rueil-Malmaison (France)

    2004-07-01

    Epoxy coatings have been used extensively for pipeline protection in the oil and gas industries over the past decades. Thank to their outstanding adhesive properties, epoxy resins are classically used for external coating of offshore pipelines although cathodic protection is applied. They provide corrosion protection while being used as neat coating or as primer layer in a three-layer coating. Protection of internal pipelines devoted to gas transport is another application of epoxy coatings. Whatever the case, the choice of the right epoxy formulation should be adapted to the service conditions, namely exposition medium and temperature, in order to provide efficient and sustainable corrosion protection. Epoxy resins constitute a wide family and classical formulations may not fulfill the requirements of today's challenges: as pipelines are require d to operate in more and more difficult conditions, coatings are expected to function in higher temperature conditions; additionally, practical conditions such as temporary injection of methanol make the environmental exposure of the epoxy coating harsher. Therefore, there is a need of a better knowledge of technical performance and limitations of high temperature epoxy resins. This paper examined the influence of the epoxy network architecture on their protection properties and durability while exposed to distilled / sea water at 110 deg. C and to methanol at room temperature. The objective was to investigate the link between resin chemistry and final performance with respect to anticorrosion applications. Five epoxy resin formulations mixed in stoichiometric proportions were cured and post-cured to infinite extent in order to achieve densely cross-linked networks exhibiting controlled and reproducible architectures. Gravimetric and pressurised differential scanning calorimetry (DSC) measurements were performed to evaluate the plasticization effect of both water and methanol on formulations under study. The related

  1. Development of anti-corrosion coating on low activation materials against fluoridation and oxidation in Flibe blanket environment

    Energy Technology Data Exchange (ETDEWEB)

    Nagasaka, Takuya, E-mail: Nagasaka@nifs.ac.jp [National Institute for Fusion Science, Oroshi 322-6, Toki, Gifu 509-5292 (Japan); Kondo, Masatoshi; Muroga, Takeo; Sagara, Akio; Motojima, Osamu [National Institute for Fusion Science, Oroshi 322-6, Toki, Gifu 509-5292 (Japan); Tsutsumi, Tatsuya; Oishi, Tatsuya [Shinto Industrial Co., Ltd., Kururi 376-10, Tokitsu, Nagasaki 851-2107 (Japan)

    2010-12-15

    W coating by vacuum plasma spray process and Cr coating by chromizing process were performed on fusion low activation materials, JLF-1 ferritic steel and NIFS-HEAT-2 vanadium alloy. The present study discusses feasibility of the coatings as anti-corrosion coating against fluoridation in Flibe for fusion low activation materials. Coatings were characterized by microstructural analysis and examination on chemical stability by corrosion tests. The corrosion tests were conducted with H{sub 2}O-47% HF solution at RT and He-1% HF-0.06 H{sub 2}O gas mixture at 823 K to simulate fluoridation and oxidation in Flibe. The coatings presented suppression of fluoride formation compared with JLF-1 or NIFS-HEAT-2, however weight loss due to WF{sub 6} formation was induced, and much Cr{sub 2}O{sub 3} was formed.

  2. A Comparative Study on Graphene Oxide and Carbon Nanotube Reinforcement of PMMA-Siloxane-Silica Anticorrosive Coatings.

    Science.gov (United States)

    Harb, Samarah V; Pulcinelli, Sandra H; Santilli, Celso V; Knowles, Kevin M; Hammer, Peter

    2016-06-29

    Carbon nanotubes (CNTs) and graphene oxide (GO) have been used to reinforce PMMA-siloxane-silica nanocomposites considered to be promising candidates for environmentally compliant anticorrosive coatings. The organic-inorganic hybrids were prepared by benzoyl peroxide (BPO)-induced polymerization of methyl methacrylate (MMA) covalently bonded through 3-(trimethoxysilyl)propyl methacrylate (MPTS) to silica domains formed by hydrolytic condensation of tetraethoxysilane (TEOS). Single-walled carbon nanotubes and graphene oxide nanosheets were dispersed by surfactant addition and in a water/ethanol solution, respectively. These were added to PMMA-siloxane-silica hybrids at a carbon (CNT or GO) to silicon (TEOS and MPTS) molar ratio of 0.05% in two different matrices, both prepared at BPO/MMA molar ratios of 0.01 and 0.05. Atomic force microscopy and scanning electron microscopy showed very smooth, homogeneous, and defect-free surfaces of approximately 3-7 μm thick coatings deposited onto A1020 carbon steel by dip coating. Mechanical testing and thermogravimetric analysis confirmed that both additives CNT and GO improved the scratch resistance, adhesion, wear resistance, and thermal stability of PMMA-siloxane-silica coatings. Results of electrochemical impedance spectroscopy in 3.5% NaCl solution, discussed in terms of equivalent circuits, showed that the reinforced hybrid coatings act as a very efficient anticorrosive barrier with an impedance modulus up to 1 GΩ cm(2), approximately 5 orders of magnitude higher than that of bare carbon steel. In the case of GO addition, the high corrosion resistance was maintained for more than 6 months in saline medium. These results suggest that both carbon nanostructures can be used as structural reinforcement agents, improving the thermal and mechanical resistance of high performance anticorrosive PMMA-siloxane-silica coatings and thus extending their application range to abrasive environments.

  3. Anticorrosive performance of waterborne epoxy coatings containing water-dispersible hexagonal boron nitride (h-BN) nanosheets

    Science.gov (United States)

    Cui, Mingjun; Ren, Siming; Chen, Jia; Liu, Shuan; Zhang, Guangan; Zhao, Haichao; Wang, Liping; Xue, Qunji

    2017-03-01

    Homogenous dispersion of hexagonal boron nitride (h-BN) nanosheets in solvents or in the polymer matrix is crucial to initiate their many applications. Here, homogeneous dispersion of hexagonal boron nitride (h-BN) in epoxy matrix was achieved with a water-soluble carboxylated aniline trimer derivative (CAT-) as a dispersant, which was attributed to the strong π-π interaction between h-BN and CAT-, as proved by Raman and UV-vis spectra. Transmission electron microscopy (TEM) analysis confirmed a random dispersion of h-BN nanosheets in the waterborne epoxy coatings. The deterioration process of water-borne epoxy coating with and without h-BN nanosheets during the long-term immersion in 3.5 wt% NaCl solution was investigated by electrochemical measurements and water absorption test. Results implied that the introduction of well dispersed h-BN nanosheets into waterborne epoxy system remarkably improved the corrosion protection performance to substrate. Moreover, 1 wt% BN/EP composite coated substrate exhibited higher impedance modulus (1.3 × 106 Ω cm2) and lower water absorption (4%) than those of pure waterborne epoxy coating coated electrode after long-term immersion in 3.5 wt% NaCl solution, demonstrating its superior anticorrosive performance. This enhanced anticorrosive performance was mainly ascribed to the improved water barrier property of epoxy coating via incorporating homogeneously dispersed h-BN nanosheets.

  4. Adsorption of alginate and albumin on aluminum coatings inhibits adhesion of Escherichia coli and enhances the anti-corrosion performances of the coatings

    Energy Technology Data Exchange (ETDEWEB)

    He, Xiaoyan; Liu, Yi; Huang, Jing; Chen, Xiuyong; Ren, Kun; Li, Hua, E-mail: lihua@nimte.ac.cn

    2015-03-30

    Graphical abstract: - Highlights: • Adsorption behaviors of alginate and albumin on Al coatings were investigated at molecular level. • The adsorption inhibits effectively the colonization of Escherichia coli bacteria. • The adsorption alters the wettability of the Al coatings. • The conditioning layer enhances anti-corrosion performances of the Al coatings. - Abstract: Thermal-sprayed aluminum coatings have been extensively used as protective layers against corrosion for steel structures in the marine environment. The corrosion usually deteriorates from marine biofouling, yet the mechanism of accelerated corrosion of the coatings remains elusive. As the first stage participating in biofouling process, adsorption of molecules plays critical roles in mediating formation of biofilm. Here, we report at molecular level the adsorption behaviors of albumin and marine polysaccharide on arc-sprayed aluminum coatings and their influence on adhesion of Escherichia coli. The adsorption of alginate and albumin was characterized by infrared spectra analyses and atomic force microscopic observation. The adsorption inhibits effectively adhesion of the bacteria. Further investigation indicates that alginate/albumin altered the hydrophilicity/hydrophobicity of the coatings instead of impacting the survival of the bacteria to decline their adhesion. The conditioning layer composed of the molecules enhances anti-corrosion performances of the coatings.

  5. Scratch Cell Test: A Simple, Cost Effective Screening Tool to Evaluate Self-Healing in Anti-Corrosion Coatings

    Science.gov (United States)

    Rani, Amitha; Somaiah, Durga; Megha; Poddar, Mitalee

    2014-09-01

    A quick and simple scratch cell set up to evaluate the self-healing of an hybrid sol-gel (ormosil) coating was fabricated. This methacrylate-based anti-corrosion coating was applied on the aerospace aluminium alloy AA2024-T3, and cured at room temperature. This technique of evaluation requires minimum instrumentation. The inhibitors cerium nitrate, benzotriazole and 8-hydroxy quinoline (8-HQ) were used in the study. The self-healing ability of the inhibitors decreased in the following order: 8-HQ, BTZ and Ce. 8-HQ showed the highest self-healing ability and was comparable to the commercial hexavalent chromium conversion coating—Alodine. Spectroscopic analysis of the electrolyte and EDX of the coatings indicated the movement of the inhibitor from the coating to the site of damage, thereby effecting self-healing. It was observed that an increased inhibitor concentration in the coatings did not accelerate the healing process. Inhibitor release was slower in the coatings doped with inhibitor-loaded nano-containers, when compared to inhibitor-spiked coatings. This property of controlled release is desirable in self-healing coatings. Electro impedance studies further confirmed self-healing efficiency of the coatings. The scratch cell study reported here is the first of its kind with the ormosil under study on AA2024-T3 aluminium alloy. The results are encouraging and warranty a quick and simple qualitative screening of the self-healing potential of the inhibitors with minimum instrumentation.

  6. Use of tannin anticorrosive reaction primer to improve traditional coating systems

    Energy Technology Data Exchange (ETDEWEB)

    Matamala, G.; Droguett, G. (Universidad de Concepcion (Chile)); Smeltzer, W. (McMaster Univ., Hamilton, Ontario (Canada). Inst. for Materials Research)

    1994-04-01

    Different anticorrosive schemes applied over plain or previously shot-blasted surfaces of AISI 1010 (UNS G10100) steel plates were compared. Plates were painted with alkydic, vinylic, and epoxy anticorrosive schemes over metal treated previously with pine tannin reaction primer and over its own schemes without previous primer treatment. Anticorrosive tests were conducted in a salt fog chamber according to ASTM B 117-73. Rusting, blistering, and adhesion were assessed over time. The survey was complemented with potentiodynamic scanning tests in sodium chloride (NaCl) solution with a concentration equivalent to seawater. Corrosion currents were determined using Tafel and polarization resistance techniques. Results showed the reaction primer inhibited corrosion by improving adherence. Advantages over traditional conversion primers formulated in a base of zinc chromate in phosphoric medium were evident.

  7. An electrochemical method for evaluating the resistance to cathodic disbondment of anti-corrosion coatings on buried pipelines

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Methods for evaluating the resistance to cathodic disbondment (RCD) of anti-corrosion coatings on buried pipelines were reviewed. It is obvious that these traditional cathodic disbondment tests (CDT) have some disadvantages and the evaluated results are only simple figures and always rely on the subjective experience of the operator. A new electrochemical method for evaluating the RCD of coatings, that is, the potentiostatic evaluation method (PEM), was developed and studied. During potentiostatic anodic polarization testing, the changes of stable polarization current of specimens before and after cathodic disbonding (CD) were measured,and the degree of cathodic disbondment of the coating was quantitatively evaluated, among which the equivalent cathodic disbonded distance △D was suggested as a parameter for evaluating the RCD. A series of testing parameters of the PEM were determined in these experiments.

  8. Anti-corrosion coating of wind power equipment%风力发电设备防腐涂装

    Institute of Scientific and Technical Information of China (English)

    李承宇; 王会阳; 晁兵; 李萍; 倪雅

    2011-01-01

    The running environment and corrosion status of wind power equipment was analyzed. The anti-corrosion design methods for towers, vanes and other parts were introduced. Some shortcomings existing in wind power coatings development and coating practice in China and corresponding suggestions were presented.%分析了风力发电设备的运行环境与腐蚀状况,介绍了风电塔架、叶片和其它部件的防腐设计方法,指出了我国风电涂料开发与涂装实践中存在的不足,并提出了相应的建议.

  9. Graphene coating for anti-corrosion and the investigation of failure mechanism

    Science.gov (United States)

    Zhu, Y. X.; Duan, C. Y.; Liu, H. Y.; Chen, Y. F.; Wang, Y.

    2017-03-01

    Graphene produced by chemical vapor deposition (CVD) methods has been considered as a promising corrosion prevention layer because of its exceptional structure and impermeability. However, the anti-corrosion performance and the failure mechanism are still controversial. In this study, graphene layers with different quality levels, crystallite sizes, and layer numbers were prepared on the surface of Cu by a CVD process. The effects of grain boundaries (GBs) on the failure of graphene layers to provide adequate protection were investigated in detail by combining graphene transfer techniques, computation, and anti-corrosion measurements. Our results reveal that corrosion rates decrease marginally upon the increase of graphene layer number, and this rather weak dependence on thickness likely arises from the aligned nature of the GBs in CVD-grown few-layer graphene. This problem can potentially be overcome by layer-by-layer graphene transfer technique, in which corrosion is found to be arrested locally when transferred graphene is present on top of the as-grown graphene. However, this advantage is not reflected in corrosion studies performed on large-scale samples, where cracks or imperfect interfaces could offset the advantages of GB misalignment. With improvements in technology, the layer-by-layer assembly technique could be used to develop an effective anti-corrosion barrier.

  10. Research progress of anti-corrosion epoxy resin coating%防腐环氧树脂粘接涂层的研究进展

    Institute of Scientific and Technical Information of China (English)

    明杜; 舒武炳; 秦卫

    2011-01-01

    Several mechanisms were introduced for anti -corrosion coatings, then the research progresses of epoxy resin(EP) anti-corrosion coating at home and abroad were also introduced from development of some fields such as filler,corrosion inhibitor,EP matrix resin and EP conductive coating. Finally,the development direction of EP anti-corrosion coating based on environmental protection trend was expected.%简要介绍了粘接涂层防腐的几种机制.从填料的发展、缓蚀剂的发展、EP(环氧树脂)基体的发展和导电EP粘接涂层的发展等方面,介绍了国内外防腐EP粘接涂层的研究进展.最后基于环保性趋势对防腐EP粘接涂层的发展方向作了展望.

  11. Modifying the TiAlZr biomaterial surface with coating, for a better anticorrosive and antibacterial performance

    Energy Technology Data Exchange (ETDEWEB)

    Ionita, Daniela; Grecu, Mihaela; Ungureanu, Camelia [University ' Politehnica' of Bucharest, Faculty of Applied Chemistry and Materials Science 1-7, Polizu Str., 011061, Bucharest (Romania); Demetrescu, Ioana, E-mail: i_demetrescu@chim.upb.ro [University ' Politehnica' of Bucharest, Faculty of Applied Chemistry and Materials Science 1-7, Polizu Str., 011061, Bucharest (Romania)

    2011-08-15

    The paper investigates the increase of anticorrosive and antimicrobial properties of a composite elaborated by coating TiAlZr with Ag nanoparticles. Silver nanoparticles (AgNPs) were synthesized by reducing silver salts using NaBH{sub 4}, and were characterized using dynamic light scattering instrument to determine the size distribution. The morphological and elemental analysis of Ag nanoparticles on the TiAlZr surface were performed with scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS). Antibacterial activity was evaluated on the basis of the inhibition of the growth of Escherichia coli bacteria, and of the electrochemical parameters from dynamic polarization tests performed in Ringers bioliquid. An empirical model of antibacterial effect of silver nanoparticles at biointerface in the presence of TiAlZr implant was discussed.

  12. Modifying the TiAlZr biomaterial surface with coating, for a better anticorrosive and antibacterial performance

    Science.gov (United States)

    Ionita, Daniela; Grecu, Mihaela; Ungureanu, Camelia; Demetrescu, Ioana

    2011-08-01

    The paper investigates the increase of anticorrosive and antimicrobial properties of a composite elaborated by coating TiAlZr with Ag nanoparticles. Silver nanoparticles (AgNPs) were synthesized by reducing silver salts using NaBH 4, and were characterized using dynamic light scattering instrument to determine the size distribution. The morphological and elemental analysis of Ag nanoparticles on the TiAlZr surface were performed with scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS). Antibacterial activity was evaluated on the basis of the inhibition of the growth of Escherichia coli bacteria, and of the electrochemical parameters from dynamic polarization tests performed in Ringers bioliquid. An empirical model of antibacterial effect of silver nanoparticles at biointerface in the presence of TiAlZr implant was discussed.

  13. Anti-corrosive Effects of Multi-Walled Carbon Nano Tube and Zinc Particle Shapes on Zinc Ethyl Silicate Coated Carbon Steel

    Energy Technology Data Exchange (ETDEWEB)

    Jang, JiMan; Shon, MinYoung; Kwak, SamTak [Pukyong National University, Busan (Korea, Republic of)

    2016-01-15

    Zinc ethyl silicate coatings containing multi walled carbon nanotubes (MWCNTs) were prepared, to which we added spherical and flake shaped zinc particles. The anti-corrosive effects of MWCNTs and zinc shapes on the zinc ethyl silicate coated carbon steel was examined, using electrochemical impedance spectroscopy and corrosion potential measurement. The results of EIS and corrosion potential measurement showed that the zinc ethyl silicate coated with flake shaped zinc particles and MWCNT showed lesser protection to corrosion. These outcomes were in agreement with previous results of corrosion potential and corrosion occurrence.

  14. Effect of cerium (IV) ions on the anticorrosion properties of siloxane-poly(methyl methacrylate) based film applied on tin coated steel

    Energy Technology Data Exchange (ETDEWEB)

    Suegama, P.H. [Departamento de Engenharia Quimica, Escola Politecnica, Universidade de Sao Paulo, CP 61548, 05424-970 Sao Paulo, SP (Brazil); Sarmento, V.H.V. [Departamento Fisico-Quimica, Instituto de Quimica, Universidade Estadual Paulista, UNESP, CP 355, 14801-970 Araraquara, SP (Brazil); Montemor, M.F. [ICEMS, Instituto Superior Tecnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa (Portugal); Benedetti, A.V. [Departamento Fisico-Quimica, Instituto de Quimica, Universidade Estadual Paulista, UNESP, CP 355, 14801-970 Araraquara, SP (Brazil); de Melo, H.G.; Aoki, I.V. [Departamento de Engenharia Quimica, Escola Politecnica, Universidade de Sao Paulo, CP 61548, 05424-970 Sao Paulo, SP (Brazil); Santilli, C.V., E-mail: santilli@iq.unesp.b [Departamento Fisico-Quimica, Instituto de Quimica, Universidade Estadual Paulista, UNESP, CP 355, 14801-970 Araraquara, SP (Brazil)

    2010-07-15

    This work investigates the influence of the addition of cerium (IV) ions on the anticorrosion properties of organic-inorganic hybrid coatings applied to passivated tin coated steel. In order to evaluate the specific effect of cerium (IV) addition on nanostructural features of the organic and inorganic phases of the hybrid coating, the hydrolytic polycondensation of silicon alkoxide and the radical polymerization of the methyl methacrylate (MMA) function were induced separately. The corrosion resistance of the coatings was evaluated by means of linear polarization, Tafel type curves and electrochemical impedance measurements. The impedance results obtained for the hybrid coatings were discussed based on an electrical equivalent circuit used to fit the experimental data. The electrochemical results clearly showed the improvement of the protective properties of the organic-inorganic hybrid coating mainly when the cerium (IV) was added to the organic phase solution precursor, which seemed to be due to the formation of a more uniform and densely reticulated siloxane-PMMA film.

  15. 浅析化工设备防腐蚀涂装的质量控制%The Quality Control of Anticorrosion Coating of Chemical Equipment

    Institute of Scientific and Technical Information of China (English)

    何刚

    2016-01-01

    This paper analyzed the quality control of chemical equipment anticorrosion coating from the aspects of the surface treatment before painting, the quality control of painting process and coating defects treatment, etc.%本文从涂装前表面处理、涂装过程的质量控制、涂装缺陷的处理等方面入手,浅析了化工设备防腐蚀涂装的质量控制。

  16. Superhydrophobic epoxy coating modified by fluorographene used for anti-corrosion and self-cleaning

    Science.gov (United States)

    Yang, Zhengqing; Wang, Lida; Sun, Wen; Li, Sijia; Zhu, Tianzhen; Liu, Wei; Liu, Guichang

    2017-04-01

    A facile method for the fabrication of organic coating with superhydrophobic surface on copper substrate is presented in this paper. Liquid-phase exfoliated fluorographene (FG) nanosheets, a low-surface-energy material with different sizes and shapes, are spatially stuck on the surface of epoxy resin coating to build rough surface with random micro/nano structure. The built coating system displays superior protection performances due to its self-cleaning function, mechanical abrasion resistance and chemical stability both in acidic and alkaline aqueous solutions. It not only provides a facile process for superhydrophobic modification of organic coating, but also introduces a new and effective strategy to protect materials by synergistically coupling the protection function of both superhydrophobic surface and organic coating, which can be used for large-scale manufacturing of superhydrophobic organic coating in industrial applications.

  17. Study on Anticorrosive Cerium Conversion Coating of Cf/6061Al Composite Surface

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The optimum chemical passivation process of the rare earth metal (REM) conversion coating on the Cf/6061Al composite surface was introduced in this paper and its polarization curves properties were investigated. Ridge-like coatings were found by scanning electro microscope (SEM) observations, and the Al matrix and carbon fibre reinforcement were both coated with Ce conversion coatings, with some minor cracks. The energy dispersive spectroscopy (EDS) plane scan analysis indicates that the major elements in the coating are Ce, O, Si, Al and the Ce content reaches 47.48%(mass fraction). The Ce conversion coatings increase the corrosion resisting properties of Cf/6061Al composite, with a higher free corrosion potential (Ecorr) and a lower free corrosion current density (icorr) for the coated composite than those of the bare composite. And the Boehmite-treatment would enhance the corrosion resistance of the REM conversion coating. The cathodic polarization and anodic polarization were retarded by REM conversion coating, resulting in an improved corrosion resistance.

  18. Development of Castor Oil Based Poly(urethane-esteramide/TiO2 Nanocomposites as Anticorrosive and Antimicrobial Coatings

    Directory of Open Access Journals (Sweden)

    Mohammed Rafi Shaik

    2015-01-01

    Full Text Available Castor oil based polyesteramide (CPEA resin has been successfully synthesized by the condensation polymerization of N-N-bis (2-hydroxyethyl castor oil fatty amide (HECA with terephthalic acid and further modified with different percentages of 7, 9, 11, and 13 wt.% of toluene-2,4-diisocyanate (TDI to obtain poly(urethane-esteramide (UCPEA, via addition polymerization. TiO2 (0.1, 0.2, 0.3, 0.4, and 0.5 wt% nanoparticles were dispersed in UCPEA resin. The structural elucidation of HECA, CPEA, and UCPEA has been carried out using FT-IR, 1H-NMR, and 13C-NMR spectroscopic techniques while physicochemical and physicomechanical properties were investigated by standard methods. Thermal stability and molecular weight of UCPEA have been assessed by thermogravimetric analysis (TGA and gel permeation chromatography (GPC, respectively. Furthermore, the corrosion behavior of UCPEA coatings on mild steel has been investigated by potentiodynamic polarization measurements in different corrosive environments (3.5 wt% HCl, 5 wt% NaCl, 3.5 wt% NaOH, and tap water at room temperature and surface analysis by scanning electron microscope (SEM and energy dispersive X-ray (EDX. The antibacterial activities of the UCPEA were tested against bacteria and fungi by agar disc diffusion method. The results of this study have revealed that UCPEA nanocomposite coatings exhibit good physicomechanical, anticorrosion and antimicrobial properties, which can be safely used up to 200°C.

  19. Cathodic delamination of seawater-immersed anticorrosive coatings: Mapping of parameters affecting the rate

    DEFF Research Database (Denmark)

    Sørensen, Per Aggerholm; Dam-Johansen, Kim; Weinell, C. E.

    2010-01-01

    Abstract: Cathodic delamination is one of the major modes of failure for organic coatings immersed in seawater and refers to the weakening or loss of adhesion between the coating and the substrate. The diminished adhesion is the result of electrochemical reactions occurring at the coating......-steel interface, where solid iron is oxidized to ferrous ions and oxygen is reduced to hydroxyl ions. In this work, the effects of various parameters on cathodic delamination have been investigated. The parameters are: permeability of the coating, concentration of dissolved oxygen and cations, polarization...... potential, type of binder, degree of curing, and pigment loading, shape and type. The results show that cathodic delamination increases with increasing concentration of cations up to the point where the concentration of dissolved oxygen becomes insufficient to maintain the corrosion rate. The rate...

  20. Thermally Sprayable Anti-corrosion Marine Coatings Based on MAH-g-LDPE/UHMWPE Nanocomposites

    Science.gov (United States)

    Jeeva Jothi, K.; Santhoskumar, A. U.; Amanulla, Syed; Palanivelu, K.

    2014-12-01

    Polymer composite coatings based on low-density polyethylene (LDPE) and ultra-high-molecular-weight polyethylene (UHMWPE) blends were prepared for marine coatings. The incorporation of carboxyl moiety in the polymer blends of LDPE/UHMWPE was carried out by grafting with maleic anhydride (MAH) at varying concentrations of 1-8 wt.% using reactive extrusion process. An optimum percentage of grafting of 2.1% was achieved with 5 wt.% of maleic anhydride. Further, the nanocomposites of MAH-grafted-LDPE/UHMWPE blends were prepared by incorporating cloisite 15A nanoclay at varying concentrations of 1-4 wt.%. The polymer nanocomposites were converted into fine powders suitable for thermal spray having ≤200 μ particle size using cryogenic grinding. The effect of the intact coatings applied on grit-blasted mild steel by thermal spray technique was evaluated for abrasion resistance, adhesion strength, and corrosion resistance. The corrosion resistance of the polymer nanocomposites was studied by salt spray technique and Electrochemical Impedance Spectroscopy The abrasion resistance of coatings increases with increasing UHMWPE content in the blends. However, blends with higher concentration of UHMWPE resulted in coarse coatings with poor adhesion. The coatings with 90:10 MAH-grafted-LDPE/UHMWPE having 3 wt.% of nanoclay showed good abrasion resistance, adhesion strength, and better corrosion resistance.

  1. Nanocasting technique to prepare lotus-leaf-like superhydrophobic electroactive polyimide as advanced anticorrosive coatings.

    Science.gov (United States)

    Chang, Kung-Chin; Lu, Hsin-I; Peng, Chih-Wei; Lai, Mei-Chun; Hsu, Sheng-Chieh; Hsu, Min-Hsiang; Tsai, Yuan-Kai; Chang, Chi-Hao; Hung, Wei-I; Wei, Yen; Yeh, Jui-Ming

    2013-02-01

    Nanocasting technique was used to obtain a biomimetic superhydrophobic electroactive polyimide (SEPI) surface structure from a natural Xanthosoma sagittifolium leaf. An electroactive polyimide (EPI) was first synthesized through thermal imidization. An impression of the superhydrophobic Xanthosoma sagittifolium leaf was then nanocasted onto the surface of the EPI so that the resulting EPI was superhydrophobic and would prevent corrosion. Polydimethylsiloxane (PDMS) was then used as a negative template to transfer the impression of the superhydrophobic surface of the biomimetic EPI onto a cold-rolled steel (CRS) electrode. The superhydrophobic electroactive material could be used as advanced coatings that protect metals against corrosion. The morphology of the surface of the as-synthesized SEPI coating was investigated using scanning electron microscopy (SEM). The surface showed numerous micromastoids, each decorated with many nanowrinkles. The water contact angle (CA) for the SEPI coating was 155°, which was significantly larger than that for the EPI coating (i.e., CA = 87°). The significant increase in the contact angle indicated that the biomimetic morphology effectively repelled water. Potentiodynamic and electrochemical impedance spectroscopic measurements indicated that the SEPI coating offered better protection against corrosion than the EPI coating did.

  2. Development of Castor oil Modified Epoxy Polyurethane Anti-corrosion Coatings%蓖麻油改性环氧聚氨酯防腐蚀涂料的研制

    Institute of Scientific and Technical Information of China (English)

    李阳

    2012-01-01

    A kind of castor oil-modified epoxy polyurethane anti-corrosion coating was introduced. Castor oil modified isocyanate prepolymer and epoxy resin were used as basic materials,cheap talc, titanium dioxide, precipitated barium sulfate were used as pigment and filler , a kind of low cost and excellent performance anti-corrosion coating was developed. The performance of the coating developed under optimized conditions was detected. Castor oil modified epoxy polyurethane anti-corrosion coating and epoxy polyurethane anti-corrosion coating were compared. The results show that castor oil modified epoxy polyurethane anti-corrosion coating is better than epoxy polyurethane anti-corrosion coating in the aspects of acid - resistant, alkali - resistant and seawater - resistant.%介绍了一种蓖麻油改性的环氧聚氨酯防腐蚀涂料、以蓖麻油改性异氰酸酯预聚物和环氧树脂为基料,以价格较为低廉的滑石粉、钛白粉、沉淀硫酸钡为颜填料制备了成本较低,件能较为优异的防腐蚀涂料.检测了优化条件下制备的涂料的性能.以蓖麻油改性环氧聚氨酯防腐蚀涂料和未经蓖麻油改件的环氧聚氨酯防腐蚀涂料进行防腐蚀性能对比,蓖麻油改性环氧聚氨酯防腐蚀涂料的耐酸、碱、盐水等防腐蚀性能更好.

  3. Zn-Ni合金防腐涂层技术研究进展%The Development of Zn-Ni Alloy Anticorrosive Coating

    Institute of Scientific and Technical Information of China (English)

    乔小平; 李鹤林; 赵文轸

    2011-01-01

    The way of forming Zn-Ni alloy coating is a newly developed anticorrosive technology. The corrosion resistance of the Zn-Ni alloy coatings is better than that of unalloyed zinc, which shows a trend of substituting for zinc coatings and will be widely applied in the areas of steel protection. In this work, the recent development of the study on preparing Zn-Ni alloy coatings by electroplating, hot dipping, thermal spraying and diffusion are reviewed. The anti-corrosion mechanism of the Zn-Ni alloy coatings is discussed. The preparation of Zn-Ni basic alloy is the key work for the development of Zn-Ni alloy coating. The exploration of newly Zn-Ni composite coatings is the approach for the breakthrough of application; meanwhile, the research on the anti-corrosion mechanism of Zn-Ni alloy coatings should be further intensified to provide guidance for the research and application of the zinc-nickel alloy coatings.%Zn-Ni合金涂层技术是近年发展起来的防腐涂层新技术,与锌涂层相比,该涂层具有十分优异的腐蚀防护性能.随着工业的发展,Zn-Ni合金涂层将会成为锌的替代性涂层,在钢铁腐蚀防护领域得到广泛应用,极具发展前景.文中介绍了用电镀、热浸镀、热喷涂和渗镀的方法制备Zn-Ni合金涂层的主要进展情况,讨论了Zn-Ni合金涂层的腐蚀防护机理,指出了今后应把开发Zn- Ni合金基材作为Zn- Ni合金涂层技术获得突破的关键,把开发Zn-Ni复合涂层作为扩大Zn- Ni合金涂层应用的手段,同时应加强对Zn- Ni合金涂层耐腐蚀机理的研究,为Zn- Ni合金涂层技术的研究和应用提供理论指导.

  4. Intelligent saline enabled self-healing of multilayer coatings and its optimization to achieve redox catalytically provoked anti-corrosion ability

    Science.gov (United States)

    Syed, Junaid Ali; Tang, Shaochun; Meng, Xiangkang

    2016-10-01

    To obtain a coating with both self-healing and redox catalytic ability to protect a metal substrate from corrosion under aggressive environment is strongly desired. Herein, we report the design and fabrication of intelligent polyaniline-polyacrylic acid/polyethyleneimine (PANI-PAA/PEI) multilayer composite coatings by spin assembly. The main influencing factors, including solution concentration (c) and disk rotating speed (ω) were studied in order to gain excellent performance. The resulting multilayer coatings with thickness in a range from 0.47 to 2.94 μm can heal severe structural damages and sustain a superior anti-corrosive performance for 120 h in 3.5% NaCl. The PANI-PAA layer enhances the anti-corrosion property and PEI layer contributes to the self-healing ability as well as their multilayer combination strengthens them. The improved self-healing ability is attributed to the rearrangement and reversible non-covalent interactions of the PANI-PAA and PEI layers that facilitates electrostatic repairing.

  5. Synthesis of durable microcapsules for self-healing anticorrosive coatings: A comparison of selected methods

    DEFF Research Database (Denmark)

    Nesterova, Tatyana; Dam-Johansen, Kim; Kiil, Søren

    2011-01-01

    core materials were not suitable for encapsulation of other compounds without modifications. This is a severe limitation as not many of the encapsulation procedures have been developed for industrially relevant core materials such as epoxy resin. Results of experiments, aiming at finding optimal......Self-healing materials have the ability to ‘repair’ themselves upon exposure to an external stimulus. In the field of coatings, extensive laboratory research has been conducted on these so-called smart materials in the last decade. In the present work, a self-healing concept for epoxy...

  6. The effects of addition of poly(vinyl) alcohol (PVA) as a green corrosion inhibitor to the phosphate conversion coating on the anticorrosion and adhesion properties of the epoxy coating on the steel substrate

    Energy Technology Data Exchange (ETDEWEB)

    Ramezanzadeh, B., E-mail: ramezanzadeh-bh@icrc.ac.ir; Vakili, H.; Amini, R.

    2015-02-01

    Highlights: • Room temperature zinc phosphate coating was applied on the surface of steel sample. • Poly(vinyl) alcohol was added to the phosphating bath as a green corrosion inhibitor. • The adhesion and anticorrosion properties of the epoxy coating were investigated. • PVA decreased the phosphate crystal size and porosity. • PVA enhanced the corrosion protection and adhesion properties of the epoxy coating. - Abstract: Steel substrates were chemically treated by room temperature zinc phosphate conversion coating. Poly(vinyl) alcohol (PVA) was added to the phosphate solution as a green corrosion inhibitor. Finally, the epoxy/polyamide coating was applied on the untreated and surface treated steel samples. The effects of PVA on the morphological properties of the phosphate coating were studied by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and contact angle measuring device. The adhesion properties of the epoxy coatings applied on the surface treated samples were investigated by pull-off and cathodic delamination tests. Also, the anticorrosion properties of the epoxy coatings were studied by electrochemical impedance spectroscopy (EIS). Results showed that addition of PVA to the phosphate coating increased the population density of the phosphate crystals and decreased the phosphate grain size. The contact angle of the steel surface treated by Zn-PVA was lower than Zn treated one. The corrosion resistance of the epoxy coating was considerably increased on the steel substrate treated by zinc phosphate conversion coating containing PVA. PVA also enhanced the adhesion properties of the epoxy coating to the steel surface and decreased the cathodic delamination significantly.

  7. Anticorrosion Coating of Carbon Nanotube/Polytetrafluoroethylene Composite Film on the Stainless Steel Bipolar Plate for Proton Exchange Membrane Fuel Cells

    Directory of Open Access Journals (Sweden)

    Yoshiyuki Show

    2013-01-01

    Full Text Available Composite film of carbon nanotube (CNT and polytetrafluoroethylene (PTFE was formed from dispersion fluids of CNT and PTFE. The composite film showed high electrical conductivity in the range of 0.1–13 S/cm and hydrophobic nature. This composite film was applied to stainless steel (SS bipolar plates of the proton exchange membrane fuel cell (PEMFC as anticorrosion film. This coating decreased the contact resistance between the surface of the bipolar plate and the membrane electrode assembly (MEA of the PEMFC. The output power of the fuel cell is increased by 1.6 times because the decrease in the contact resistance decreases the series resistance of the PEMFC. Moreover, the coating of this composite film protects the bipolar plate from the surface corrosion.

  8. 高温防腐涂料与热障防腐涂层技术的研究进展%Progress in Study on Technology of High Temperature Resistant and Thermal Barrier Anti-corrosion Coatings

    Institute of Scientific and Technical Information of China (English)

    张春华; 李克军; 李安学; 李春启; 左玉帮

    2011-01-01

    综述了国内外耐高温防腐有机、无机和有机-无机复合涂料和热障防腐涂层技术的研究与应用的新进展,介绍了有机硅树脂、有机氟树脂、无机硅酸盐基涂料、无机磷酸盐基涂料、陶瓷涂层和搪瓷涂层的发展现状和前景.%The progresses in application and study on technology of high temperature resistant anti-corrosion organic, inorganic and organic-inorganic composite coatings and thermal barrier anti-corrosion coatings are summarized. The development status and prospects of organic silicon resin, organic fluororesin, inorganic silicate based coating, inorganic phosphate based coating, ceramic and enamel coatings are introduced.

  9. Effect of cerium on structure modifications of a hybrid sol–gel coating, its mechanical properties and anti-corrosion behavior

    Energy Technology Data Exchange (ETDEWEB)

    Cambon, Jean-Baptiste, E-mail: cambon@chimie.ups-tlse.fr [Institut Carnot CIRIMAT, Université de Toulouse, UMR CNRS 5085, 118 Route de Narbonne, 31062 Toulouse Cedex 9 (France); Esteban, Julien; Ansart, Florence; Bonino, Jean-Pierre; Turq, Viviane [Institut Carnot CIRIMAT, Université de Toulouse, UMR CNRS 5085, 118 Route de Narbonne, 31062 Toulouse Cedex 9 (France); Santagneli, S.H.; Santilli, C.V.; Pulcinelli, S.H. [Departamento Fısico-Química, Instituto de Química, Universidade Estadual Paulista, UNESP, CP 355, 14801-970 Araraquara, SP (Brazil)

    2012-11-15

    Highlights: ► New sol–gel routes to replace chromates for corrosion protection of aluminum. ► Effect of cerium concentration on the microstructure of xerogel. ► Electrochemical and mechanical performances of hybrid coating with different cerium contents. ► Good correlation between the different results with an optimal cerium content of 0.01 M. -- Abstract: An organic–inorganic hybrid coating was developed to improve the corrosion resistance of the aluminum alloy AA 2024-T3. Organic and inorganic coatings derived from glycidoxypropyl-trimethoxysilane (GPTMS) and aluminum tri-sec-butoxide Al(O{sup s}Bu){sub 3}, with different cerium contents, were deposited onto aluminum by dip-coating process. Corrosion resistance and mechanical properties were investigated by electrochemical impedance measurements and nano-indentation respectively. An optimal cerium concentration of 0.01 M was evidenced. To correlate and explain the hybrid coating performances in relation to the cerium content, NMR experiments were performed. It has been shown that when the cerium concentration in the hybrid is higher than 0.01 M there are important modifications in the hybrid structure that account for the mechanical properties and anti-corrosion behavior of the sol–gel coating.

  10. Development of reinforced in-situ anti-corrosion and wear Zn-TiO2/ZnTiB2 coatings on mild steel

    Science.gov (United States)

    Fayomi, O. S. I.; Popoola, A. P. I.; Kanyane, L. R.; Monyai, T.

    The development of reinforced composite coating has resulted into advanced engineering application because of the exceptional properties and increase service life. In this study, we investigated the effect of Solanum tuberosum (ST) as additive to Zn-TiO2/Zn-TiB2 sulphate bath coating by co-deposition route on mild steel. The structural characteristics and surface profile of the produced coating were examined using scanning electron microscope coupled with energy dispersive spectroscopy (SEM/EDS) and PosiTector (SPG) respectively. The anti-corrosion resistance activities of the deposited coatings were evaluated on a 101 AUTOLAB potentiostat/galvanostat device in a 3.65 wt% NaCl. The wear characteristics of the Zn-TiO2/TiB2 composite coatings were examined on a dry abrasive MTR-300 test rig. The thermal stability of the produced coatings was studied in an isothermal furnace at 600 °C and further characterized using a high tech optical microscope. From the results, it was found that Zn-TiO2/Zn-TiB2 were compassed with needle like pattern and perhaps a compact and distinctive structure was found with Zn-TiO2/Zn-TiB2/ST coatings. The microhardness deposited coatings increased with TiO2 and TiB2 interference in the plating bath, more significant improvement was noticed in the presence of natural bath-additive and the addition of ST lead to changes in the morphologies of the composite coatings. A massive decrease in corrosion and wear rate in all coatings produced as against the control sample was noticed. This was attributed to the dispersive strengthening activities of the embedded TiO2/TiB2/ST additive on the bath formed.

  11. IPcote9183金属陶瓷涂层制备及其性能%Performance of Metallic-Ceramic Anti-Corrosion Coating IPcote9183

    Institute of Scientific and Technical Information of China (English)

    王维

    2011-01-01

    An aluminium containing high-temperature anti-corrosion water-based paint was used to prepare metallic-ceramic coating, and performance of the coating was studied. The results showed that the coating was uniform and had good adhesion under the conditions of a certain spray pressure and nozzle/sample distance. The coating thickness was 0. 01 - 0. 02 mm for every IPcote9183 layer. The thickness could increase by repeating spray + dry. The coating with thickness of 0. 02 ~ 0. 03 mm was used to salt fog test and there was no red rust after 1000 h.%用一种进口水基含铝高温防腐蚀涂料制备了金属陶瓷涂层,介绍了制备的工艺,对该涂层的性能进行了研究.结果表明,按照一定的喷涂压力和喷涂距离进行喷涂,可获得表面均匀、结合良好的涂层.喷涂一层IPcote9183可以获得厚度为0.01 mm~0.02 mm的涂层;可进行多层喷涂.厚度为0.02~0.03mm的涂层,中性盐雾试验可达到1000 h不出现红锈.

  12. Simultaneous determination of rare earth elements in ore and anti-corrosion coating samples using a portable capillary electrophoresis instrument with contactless conductivity detection.

    Science.gov (United States)

    Nguyen, Thi Anh Huong; Nguyen, Van Ri; Le, Duc Dung; Nguyen, Thi Thanh Binh; Cao, Van Hoang; Nguyen, Thi Kim Dung; Sáiz, Jorge; Hauser, Peter C; Mai, Thanh Duc

    2016-07-29

    The employment of an in-house-made capillary electrophoresis (CE) instrument with capacitively coupled contactless conductivity detection (C(4)D) as a simple and inexpensive solution for simultaneous determination of many rare earth elements (REEs) in ore samples from Vietnam, as well as in anti-corrosion coating samples is reported. 14 REEs (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) were determined using an electrolyte composed of 20mM arginine and 10mM α-hydroxyisobutyric acid adjusted to pH 4.2 with acetic acid. The best detection limit achieved was 0.24mg/L using the developed CE-C(4)D method. Good agreement between results from CE-C(4)D and the confirmation method (ICP-MS) was achieved, with a coefficient of determination (r(2)) for the two pairs of data of 0.998.

  13. Development of PPESK High Temperature Resistant and Anticorrosive Coating%聚醚砜酮耐温防腐涂料的研制

    Institute of Scientific and Technical Information of China (English)

    靳钊; 左娟娟; 王志浩

    2013-01-01

    以聚醚砜酮(PPESK)为基料,分别以云母氧化铁、超磷锌白、磷铁粉为防腐填料,制备了耐高温防腐涂料.研究了填料类型对涂层耐高温防腐性能的影响.结果显示:以云母氧化铁为防腐填料制备的PPESK耐高温防腐涂料具有很好的耐氙灯老化及耐高温性能,耐氙灯老化时间大于42 d,可耐500℃高温,耐急冷急热性能优异;以磷铁粉为防腐填料制备的PPESK耐高温防腐涂料,耐盐雾、耐介质性能优异,耐盐雾时间大于42 d,对各种化学介质均有很好的耐性;而以超磷锌白制备的涂料,各项性能欠佳.%The title coating was prepared by use of poly (phthalazinone ether sulfone ketone) (PPESK) as binders and the iron phosphate,the micaceous iron oxide,the zinc phosphorus as fillers respectively.Three kinds of PPESK high temperature resistant and anticorrosive coating were prepared.The effect of anticorrosive fillers' type on the corrosion protective properties of the coatings were studied.The results indicated that the coating with micaceous iron oxide showed excellent xenon lamp aging resistance and high temperature resistance,the time of xenon lamp aging resistance was over 42 days and the temperature was 500 ℃ as well as good heat shock resistance.The coating with iron phosphate showed excellent salt fog resistance and chemical resistance over 42 days.But the coating with zinc phosphorus,didn't show good performance.

  14. A New Anticorrosive Coating System For Navy Ship Hulls%新型舰船船体防腐蚀涂料配套体系的研究

    Institute of Scientific and Technical Information of China (English)

    金晓鸿; 洪栋煌

    2001-01-01

    The research of a new anticorrosive coating system fo r navy ship hulls is described. The coating system consists of the anticorrosive primer (fast drying water-based inorganic silicate zinc coating or organic zin c-rich coating ), the barrier type tie coating and the special optical finishing. The system is screened out by a series of tests including traditional performance test, acce lerated test, the system compatibility test, the simulated-panel test exposed to the sea and the ship application test. The results indicate that th e system is superior to that of the existing system in protective performances a nd is complied with the new navy requirements in optical properties.%介绍了一种新型舰船船体用防腐蚀涂料配套体系.这种涂料体系是由防锈底漆(水溶性快速固化无机硅酸锌底漆或有机富锌底漆)、具有屏蔽功能的中间层涂料和具有特种光学性能的面漆组成的.通过实验室的常规性能试验、加速暴露试验和配套性试验对研制的防锈底漆、中间层涂料和面漆配套体系进行了筛选,并对筛选出的体系进行了实海环境暴露试验、模拟体实海浸泡试验以及实艇涂装应用试验.试验结果表明,该防腐蚀涂料体系在防腐蚀性能方面明显优于目前使用的涂料体系,符合海军对舰艇艇体特种光学性能的最新要求.

  15. The effects of addition of poly(vinyl) alcohol (PVA) as a green corrosion inhibitor to the phosphate conversion coating on the anticorrosion and adhesion properties of the epoxy coating on the steel substrate

    Science.gov (United States)

    Ramezanzadeh, B.; Vakili, H.; Amini, R.

    2015-02-01

    Steel substrates were chemically treated by room temperature zinc phosphate conversion coating. Poly(vinyl) alcohol (PVA) was added to the phosphate solution as a green corrosion inhibitor. Finally, the epoxy/polyamide coating was applied on the untreated and surface treated steel samples. The effects of PVA on the morphological properties of the phosphate coating were studied by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and contact angle measuring device. The adhesion properties of the epoxy coatings applied on the surface treated samples were investigated by pull-off and cathodic delamination tests. Also, the anticorrosion properties of the epoxy coatings were studied by electrochemical impedance spectroscopy (EIS). Results showed that addition of PVA to the phosphate coating increased the population density of the phosphate crystals and decreased the phosphate grain size. The contact angle of the steel surface treated by Zn-PVA was lower than Zn treated one. The corrosion resistance of the epoxy coating was considerably increased on the steel substrate treated by zinc phosphate conversion coating containing PVA. PVA also enhanced the adhesion properties of the epoxy coating to the steel surface and decreased the cathodic delamination significantly.

  16. 金属用水性隔热防腐涂料的研制%Study on Waterborne Heat-Insulating and Anti-Corrosive Coatings for Metal

    Institute of Scientific and Technical Information of China (English)

    刘成楼; 唐国军

    2012-01-01

    以防锈专用苯丙乳液为基料,以钛白粉、热反射粉、磷酸铝锌、空心玻璃微珠为颜填料,以纳米SiO2为改性材料,制备了水性隔热防腐涂料,当PVC(颜料体积浓度)为25%时,涂料具有底面合一、太阳光反射隔热、防锈防腐、绿色环保、耐候耐久、装饰性好等特点。%A waterborne heat-insu acrylic emulsion as hinder, titanium lating dioxid as pigments and fillers, and nano-SiO2 reflective insulation, rust and corrosion etc. features when PVC was 25%. and anti-corrosive coatings was prepared by special antirust styrene- e, heat-reflective powder, aluminum zinc phosphate, hollow glass beads as modified material. The coatings can be used as one coat paint. It had resistance, environmental-friendly, weather resistance, good decorative

  17. 四种颜料在有机涂层中的防腐性能对比%Anticorrosion performance comparison of four kinds of organic coatings

    Institute of Scientific and Technical Information of China (English)

    于湘; 史博; 俞志东

    2012-01-01

    Anticorrosion performance of four kinds of coatings: the epoxy resin coatings filled with SrCrO4, nano-ZnO, inhibitor intercalated hydrotalcite nano-compounds and ZnO/hydrotalcite nanocomposite as pigments immersing in the 3.5% NaCl solution, was comparatively investigated by means of electrochemical impedance spectroscopy (EIS) measurement. The results showed that the inhibitor intercalated hydrotalcite nano-compounds coating owning self-sealing function showed better corrosion resistance than the SrCrO4 and nano-ZnO coatings. However,the ZnO/hydrotalcite nanocomposite coatings showed the best corrosion resistance, which may be owed to the beneficial effect induced by the treatment with in situ created ZnO.%利用电化学阻抗谱(EIS)技术,研究了浸泡在3.5% NaCl溶液中的SrCrO4环氧涂层、纳米ZnO环氧涂层、纳米缓蚀剂插层水滑石环氧涂层和ZnO/纳米水滑石复合环氧涂层的防腐性能.结果表明,纳米缓蚀剂插层水滑石涂层对Mg-Li合金的防腐效果明显高于SrCrO4环氧涂层和纳米ZnO环氧涂层,具有活性-自修复的防腐作用;而经过改性的原位生成ZnO纳米水滑石复合涂层的防腐性能更好.

  18. Study on the Anti-corrosion Design and Coating of Truck Crane%汽车起重机防腐涂层设计及涂装

    Institute of Scientific and Technical Information of China (English)

    唐政; 刘江来; 冉隆强; 李阳; 顾广新

    2012-01-01

    The work environment of truck crane is generally quite atrocious and prone rusting. In order to improve the overall anti-corrosion performance of truck crane, some of attention points in design were proposed and the key factors in the coating process were pointed out to ensure the service life of truck crane according to the status of truck crane coating process.%汽车起重机的工作环境一般比较恶劣,容易出现局部生锈现象。为了提高汽车起重机的整体防腐性能,本文针对现有的汽车起重机涂装,讨论了防腐涂层设计中一些注意点和涂装过程中需要控制的关键因素,以确保汽车起重机在使用过程中的防腐寿命。

  19. Design of Bogie Anti-corrosive Thick Coating Intense Radiation Curing Technology and Equipment%浅析转向架防腐厚涂层强辐射固化工艺及设备设计

    Institute of Scientific and Technical Information of China (English)

    于喜年; 赵月红; 刘军

    2011-01-01

    In order to solve the problem on bogie anti-corrosive thick coating curing,then the thickness of anti-corrosion coating 250 μm or/about and the thickness of general dry film and 5~8 kg limited of scraping putty weight were required in accordance with relevant standards and specifications,as requlated with anti-corrosive thickness.Therefore,the still high quality on welding bogie was proposed and reguested.Analysis of bogie anti-corrosion thick coating paint,curing technology and optimal combination of special anti-corrosive coatings on the surface of high speed bogie was made,which is favourable for tech-equipment and process arrangement and coat infense radiation curing.Short-wave radiation heater is the key component of the coating to be cured.A special combination of structural design by elliptical surface and parabolic surface was adopted.It is more conducive to deep directional radiation which makes the solvent in the bottom of anti-corrosive coating evaporate quickly as a result of strong coating adhesion.Therefore short-wave radiation heater is more suitable for curing the thick coating of wheel axis.Intense radiation curing equipment,parametric design and its virtual assembly provide quick and easy reference in design of anti-corrosive coating curing equipment to produce other relevant products for different manufactures being concerned.%为解决转向架防腐厚涂层固化问题,依照相关标准和规范,对防腐涂层厚度作出规定,要求总干膜厚度为250μm左右,并对腻子的刮涂重量限制在5~8 kg以内,对转向架的焊接质量提出了更高的要求;分析了转向架防腐厚涂层涂覆、固化工艺以及高速动车转向架专用防腐涂料的最优组合,有利于涂层强辐射固化工艺设计和工艺过程安排;短波辐射加热器为涂层固化的关键部件,采用抛物面与椭圆面组合的特殊结构设计,更有利于深层定向辐射,使防腐涂层的底部溶剂迅速挥发,增强了涂层的附

  20. Optimal conditions for the deposition of novel anticorrosive coatings by RF magnetron sputtering for aluminum alloy AA6082

    Energy Technology Data Exchange (ETDEWEB)

    Brachetti-Sibaja, S.B. [Instituto Politécnico Nacional, Postgraduate Student of CICATA-Unidad Altamira (Mexico); Instituto Tecnológico de Cd. Madero, Cd. Madero, Tamaulipas (Mexico); Domínguez-Crespo, M.A., E-mail: mdominguezc@ipn.mx [CICATA-Altamira, Instituto Politécnico Nacional, IPN Km 14.5 Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamaulipas (Mexico); Rodil, S.E. [Universidad Nacional Autónoma de México, IIM, D.F. (Mexico); Torres-Huerta, A.M. [CICATA-Altamira, Instituto Politécnico Nacional, IPN Km 14.5 Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamaulipas (Mexico)

    2014-12-05

    Highlights: • Non-conventional technique for improving the corrosion resistance of aluminum alloys. • Effect of the deposition parameters: power, substrate temperature and deposition time. • Changes in the crystallinity of the coatings are observed with the temperature. • The structure of these coatings is found to be dependent on the nature of the substrate. • La coatings can provide a better physical barrier to inhibit the corrosion attack. - Abstract: Cerium and lanthanum coatings were deposited on glass, silicon (1 0 0), and aluminum alloy by RF magnetron sputtering in which several experimental conditions such as power, substrate temperature, and deposition time were varied, using pure CeO{sub 2} and La{sub 2}O{sub 3} targets. The effect of deposition parameters on the bonding structure, surface morphology and properties against corrosion of rare earth (RE) coatings formed on metallic substrate was reported. The microstructure and chemistry of the thin film were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and X-ray photoelectron spectroscopy (XPS); whereas their use as corrosion resistant coatings was studied in aqueous NaCl solution (3.0 wt%) by using polarization curves. Variations in these properties were observed by increasing the substrate temperature which modifies the crystallinity of the rare earth coatings. XRD and XPS findings indicate that the cerium coatings are composed by CeO{sub 2} and a significant quantity of Ce{sub 2}O{sub 3} due to oxygen deficiency in the sputtering chamber, whereas La{sub 2}O{sub 3}/La(OH){sub 3} and some La intermetallic compounds are detected in the lanthanum films. Variations in the E{sub corr} and I{sub corr} were found as a function of the thickness, texture, and morphology of the as-prepared coatings.

  1. 钢箱梁电弧喷铝防腐涂层无损检测图像分析%Image analysis of arc sprayed aluminum anticorrosive coating on steel box girder based on nondestructive test

    Institute of Scientific and Technical Information of China (English)

    刘丽娜; 刘涛

    2015-01-01

    为研究钢箱梁电弧喷铝防腐涂层防腐机理,预测其防腐寿命,加工制作钢板试样,表面电弧喷铝涂层,进行室内加速腐蚀试验。通过平板扫描仪采集对象图像,观测腐蚀发展过程。采用基于二值化图像的图像处理技术提取腐蚀形貌图像特征参数,并结合规范评定涂层腐蚀损伤级别。研究结果表明:基于二值化图像的图像处理技术可以有效区分涂层腐蚀与未腐蚀区域,实现涂层腐蚀面积定量化分析,为防腐涂层腐蚀等级评定提供新的思路,并估算200μm喷铝涂层实际海洋大气环境下的寿命为63.6年。%To study the anticorrosion mechanism of arc-sprayed aluminum anticorrosive coating on steel box girder and to predict the anticorrosive life of the coating,steel plates were manufactured and painted with aluminum on the surfaces to carry out indoor accelerated corrosion test. Corrosion image of the organic protection coating was collected by a flat scanner to observe its corrosion process. The blistering area was extracted through image processing technology to evaluate the corrosion grade. The results demonstrate that the image processing technology based on binary image can distinguish the corrosion areas from the non-corrosion areas so as to realize quantitative analysis for coating corrosion area. With the help of this technology,a new way has been presented for assessing the corrosion grade of anticorrosive coatings and the service life of 200μm aluminum coating has been estimated to be 63.6 years in the actual marine atmospheric environment.

  2. Microstructure and Anticorrosion Property of AT13 Coatings Made by Combination of Nanoparticles Doping and Plasma Spraying Technique

    Institute of Scientific and Technical Information of China (English)

    LI Chun-fu; DAI Jia-lin; WANG Bin; ZHANG Ying; HE Tao-e; LUO Ping-ya

    2004-01-01

    Al2O3+13wt%TiO2 (AT13) particles were doped with 5%~30% nanoparticles and prefabricating powders were prepared by renewed granulation. AT13 coatings were prepared on the surface of steel 45# by air plasma spraying technique with the prefabricating powders. The microstructures of the AT13 prefabricating powders and the resulting coatings were investigated by SEM and EDS and XRD. The samples were undergone corrosion in the medium of 10% H2SO4 aqueous solution at temperature 80℃. The results indicate that the blistering time of coatings in the corrosive medium was increased with the increase of doped nanoparticle concentration while the time from blistering to spalling is independent of nanoparticle concentration. The results revealed that the structure of prefabricating powders was a twisted micrometer grade particle with dimension of 40-60μm, encapsulated by nanoparticles. The homogeneity of element distribution in coatings was improved and porosity was reduced. The phases of (Al2O3) 5.333 and orthorhombic Al2TiO5 were identified . The fracture analysis confirmed that there is a large amount of vermiculate whiskers with diameter of 10nm and length of 100~200 nm in coatings and the fracture type of coatings was the ductile trans-granular fracture.

  3. Microstructure and Anticorrosion Property of AT13 Coatings Made by Combination of Nanoparticles Doping and Plasma Spraying Technique

    Institute of Scientific and Technical Information of China (English)

    LIChun-fu; DAIJia-lin; WANGBin; ZHANGYing; HETao-e; LUOPing-ya

    2004-01-01

    Al2O3+ 13wt%TiO2 (AT13) particles were doped with 5%-30% nanoparticles and prefabricating powders were prepared by renewed granulation. AT13 coatings were prepared on the surface of steel 45# by air plasma spraying technique with the prefabricating powders. The microstructures of the AT13 prefabricating powders and the resulting coatings were investigated by SEM and EDS and XRD. The samples were undergone corrosion in the medium of 10% H2SO4 aqueous solution at temperature 80℃. The results indicate that the blistering time of coatings in the corrosive medium was increased with the increase of doped nanoparticle concentration while the time from blistering to spalling is independent of nanoparticle concentration.The results revealed that the structure of prefabricating powders was a twisted micrometer grade particle with dimension of 40-60μm, encapsulated by nanoparticles. The homogeneity of element distribution in coatings was improved and porosity was reduced. The phases of (Al2O3)5.333 and orthorhombic Al2TiO5 were identified. The fracture analysis confirmed that there is a large amount of vermiculate whiskers with diameter of 10nm and length of 100-200 nm in coatings and the fracture type of coatings was the ductile trans-granular fracture.

  4. Mechanical and anticorrosive properties of graphene/epoxy resin composites coating prepared by in-situ method.

    Science.gov (United States)

    Zhang, Zhiyi; Zhang, Wenhui; Li, Diansen; Sun, Youyi; Wang, Zhuo; Hou, Chunling; Chen, Lu; Cao, Yang; Liu, Yaqing

    2015-01-20

    The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method. The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively. A significant enhancement (ca. 213% and 73 °C) in the Young modulus and thermal stability of epoxy resin coating was obtained at a loading of 0.7 wt %, respectively. Furthermore, the erosion resistance of graphene nanosheets-based epoxy resin coating was investigated by electrochemical measurement. The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year). Thus, this approach provides a novel route for improving erosion resistance and mechanical-thermal stability of polymers coating, which is expected to be used in mechanical-thermal-corrosion coupling environments.

  5. Mechanical and Anticorrosive Properties of Graphene/Epoxy Resin Composites Coating Prepared by in-Situ Method

    Directory of Open Access Journals (Sweden)

    Zhiyi Zhang

    2015-01-01

    Full Text Available The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt % was prepared by a situ-synthesis method. The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively. A significant enhancement (ca. 213% and 73 °C in the Young modulus and thermal stability of epoxy resin coating was obtained at a loading of 0.7 wt %, respectively. Furthermore, the erosion resistance of graphene nanosheets-based epoxy resin coating was investigated by electrochemical measurement. The results showed also that the Rrcco (ca. 0.3 mm/year of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year. Thus, this approach provides a novel route for improving erosion resistance and mechanical-thermal stability of polymers coating, which is expected to be used in mechanical-thermal-corrosion coupling environments.

  6. Synergism in anticorrosive paints

    Indian Academy of Sciences (India)

    G BLUSTEIN; C DEYÁ; R ROMAGNOLI

    2016-06-01

    The present work depicts synergism anticorrosive behaviour between zinc hypophosphite and zinc phosphate in a commercial pigment mixture. Also, the performance of anticorrosive paints was evaluated. Synergism anticorrosive behaviour was evaluated by corrosion potential and linear polarization measurements in pigment suspensions. The protective layer obtained with this pigment mixture was investigated by scanning electron microscopy (SEM). Then, the anticorrosive properties of the pigment were assessed by incorporating it into alkyd and epoxy paints which were evaluated by salt spray test and electrochemical noise technique. The morphology and the nature of the protective layer grown under the paint film were also studied by SEM. Experimental results showed that improved anticorrosion protection is achieved in paints with reduced zinc phosphate contents as a consequence of the synergistic interaction between zinc hypophosphite and the other components of the pigment mixture. The electrochemical noise technique proved to be adequate to monitor corrosion in painted panels and is able to detectcorrosion under the paint film from very early stages. This paper identified the need to study synergism between anticorrosive pigments to try to reduce the phosphate content in anticorrosive paints.

  7. Durability Study of Pure Polyurea Heavy Anti-corrosion Coating in Marine Atmosphere Environment%海洋大气环境下纯聚脲重防腐涂层耐久性研究

    Institute of Scientific and Technical Information of China (English)

    黄微波; 谢远伟; 胡晓; 伯忠维

    2013-01-01

    The change of mechanical properties, glossiness and molecular structure of pure polyurea heavy anti-corrosion coating(Qtech-412 coating) in marine atmosphere environment outdoor natural exposure aging and ultraviolet artificial accelerated aging were studied through FTIR,DSC and so oa The results show that the gloss of Qtech-412 coating decreased by 94. 53%, the mechanical properties remain basically unchanged after outdoor natural exposure aging for 600 d; the surface of coating lost light, organic dyes become black and mechanical properties changed little after ultraviolet artificial accelerated aging for 15000 h. FTIR and DSC test show that only the dye molecular bond of coating are fractured on the surface by the two aging ways, it appears fade or black phenomenon, but pure polyurea molecular structure is very stable; painted different anti-corrosion coatings on the steel plates, and exposed in synthetic seawater pool six months, the anticorrosive effect of pure polyurea is better than any other heavy-duty coatings. Now Qtech-412 coating has been applied to the protection engineering of Qingdao Bay Bridge pile cap structure successfully.%通过FTIR、DSC等方法,研究了在海洋大气环境户外自然曝晒老化和紫外线人工加速老化条件下,纯聚脲重防腐涂层(Qtech-412涂层)的力学性能、光泽度和分子结构变化.结果表明:Qtech-412涂层经过600 d户外自然曝晒老化后,光泽度下降94.53%,力学性能基本不变;经过15000 h紫外线人工加速老化后,涂层表面失光,有机染料变黑,力学性能变化较小;FTIR和DSC试验表明上述两种老化方式都仅仅使涂层表面染料分子的化学键断裂,出现褪色或变黑现象,内部分子结构非常稳定;在人造海水的露天水池中曝晒6个月后的划叉破坏试验表明,Qtech-412涂层实际防腐效果优于其它重防腐涂层.目前Qtech-412涂层已成功应用于青岛海湾大桥承台结构防护工程.

  8. Development and characterization of silicone/phosphorus modified epoxy materials and their application as anticorrosion and antifouling coatings

    OpenAIRE

    T. Balakrishnan; Alagar, M.; Denchev, Z.; Kumar, S. Ananda

    2006-01-01

    Epoxy resin is chosen for our present study owing to its exceptional combination of properties such as easy processing, high safety, excellent solvent and chemical resistance, toughness, low shrinkage on cure, good electrical, mechanical and corrosion resistance with excellent adhesion to many substrates. This versatility in formulation made epoxy resins widely applied for surface coatings, adhesives, laminates, composites, potting, painting materials, encapsulant for semiconductor and insula...

  9. Study On Epoxy Glass Flake Heavy Duty Anticorrosive Coatings Used in Ship%一种新型玻璃鳞片涂料的研制

    Institute of Scientific and Technical Information of China (English)

    康新征; 张寒露

    2013-01-01

    Currently, the main wall of the cabin to use distilled water ship epoxy polyamide paint as a protective coating to prevent the bulkhead corrosion protection period is generally five years or so. Such protective coatings not only short-term effect, but in the course of the film is easy to produce blister and fall off and so on. To silicone-coated paper sheet glass flake off as the main anti-rust paint, low viscosity e-poxy resin-based material, preparation of a new high-solids epoxy glass flake coating. After testing, the coating resistance to neutral salt spray test up to 3000 hours; room temperature, in distilled water environment, the effective protection coating period of up to 15 years, and after long-term soaking in distilled water, erosion, film there will be no dissolution of soluble material, will not affect the storage of distilled water, ideal for long-term storage of high purity distilled water tanks, water tanks and other equipment of the wall protection needed, can effectively meet the submarines, power plants and other departments of the distilled water storage facilities, anti-corrosion requirements.%舰艇蒸馏水舱内壁主要使用环氧聚酰胺类涂料作为防护涂料,防止舱壁腐蚀,防护期限一般为5年左右。这类涂料不仅防护期效短,而且在使用过程中涂膜易产生起泡、脱落等现象。本文中以硅氧烷包覆过的片状玻璃鳞片为主要防锈颜料,以低粘度环氧树脂为基料,制备了一种新型高固体份环氧玻璃鳞片涂料。实验表明,该涂料耐中性盐雾试验可达3000小时以上;常温条件下,在蒸馏水浸泡环境中,涂膜的有效防护期可达15年以上,并且经长期的蒸馏水浸泡,侵蚀,漆膜不会有可溶物质溶出,不会影响存储的蒸馏水水质,非常适合于长时间存储高纯度蒸馏水的水柜、水罐等设备的内壁防护需要,可有效满足舰艇、电厂等部门对蒸馏水存储设施的防腐要求。

  10. The Role of SiO2 Gas in the Operation of Anti-Corrosion Coating Produced by PVD

    Directory of Open Access Journals (Sweden)

    Meysam Zarchi

    2015-09-01

    Full Text Available This study examined theSiO2 gas present in the coatings used in corrosion industry.These layers have been created by physical vapor deposition (PVD, with an appropriate performance. Sublimation of SiO2is used to protect PVD aluminum flakes from water corrosionand to generate highly porous SiO2 flakes with holes in the nanometer range. SiOx/Al/SiOx sandwiches were made as well as Ag loaded porous SiO2 as antimicrobial filler.

  11. Study on the Anticorrosion Coating Used in the Middle of the Ship Construction Process%船舶中间施工过程用防腐涂料的研制

    Institute of Scientific and Technical Information of China (English)

    高原; 方斌; 刘华荣; 海洁; 张能; 袁阳; 陈淼

    2011-01-01

    实验以3-氨丙基甲基二乙氧基硅烷、苯甲酰氯与三甲基氯硅烷为原料制备了异氰酸烷基硅烷,并将其与液体有机硅橡胶共混后,制备了船舶中间施工过程用防腐涂料.该涂料固化后,涂层具有良好的柔韧性、耐水性、耐盐雾性、电绝缘性和耐高低温性,且防腐、防尘.%The alkyl-silane isocyanate was prepared with using 3-aminopropyl methyldiethoxy silane, benzoyl chloride and trimethylchlorosilane as raw materials. Then the anticorrosion coating used in the middle of the ship construction process was synthesized by mixing the alkylsilane isocyanate and liquid organic silicon rubber. The coating had better flexibility, water resistant, salt fog resistant, anticorrosion, electric insulation and high-low temperatures resistance and it was dustprcof.

  12. The Research of Drag Reduction Anti-corrosion Coating Technology for Marine Natural Gas Condensed Liquid Pipeline%海洋天然气凝析液管道内壁减阻防腐涂层技术研究

    Institute of Scientific and Technical Information of China (English)

    杜宝银; 李京; 陆卫中; 张晓灵; 郭旭; 高英; 张立新; 吴文通; 杨加栋; 史杰智

    2013-01-01

    According to the service characteristics of marine condensate gas pipeline, determine the development of new two types solvent-free coatings of drag reduction, including technological performance index, test method and test standard of coatings. Through the formula optimization design and pilot-plant test, finally the two types of solvent-free epoxy modified coating are suitable for anti-drag natural gas pipeline at room temperature and for anticorrosion gas liquids pipeline at medium temperature. Coatings were tested by the third party inspection agency, its performance indicators meet the design requirements. And through the field production line applied, the anti-drag and anti-corrosion coatings quality and application had met the needs of the mass production.%根据输送海洋天然气管道凝析液的服役特点,确定了研制新型的无溶剂内减阻防腐涂料的涂层类型、性能指标、检验方法和测试标准。通过配方优化设计和工艺试验,最终研制出了适用于非腐蚀性气体管道输送的常温无溶剂改性环氧涂料以及适用于天然气凝析液管道输送的中温无溶剂改性环氧涂料内减阻涂料。涂料经第三方检测机构检测,其性能及指标符合设计的要求。并通过生产线涂覆工艺的现场实施,内减阻防腐涂层质量和施工工艺满足规模化生产的需要。

  13. Anticorrosion Nanocrystalline Beta Zeolite Thin Film for Advanced Applications

    Directory of Open Access Journals (Sweden)

    Maha Saud M. Al-subaie

    2015-01-01

    Full Text Available Steel alloys corrosion is ubiquitous and is conventionally protected by anticorrosion chromate coatings. However, the process suffers from the release of carcinogenic hexavalent chromium ions that needs to be replaced by an ecofriendly alternative. In this context, the need for the development of satisfactory ecofriendly chromium-free coating with superior corrosion performance is highly desirable. In the present study, we synthesized fully dispersible nanocrystalline Beta zeolite seeds and coated on steel alloys followed by steaming. The samples were characterized by XRD, FE-SEM, and DLS analyses. The anticorrosion behavior of the synthesized nanoparticle coatings on steel alloys was investigated by electrochemical measurements (DC polarization and electrochemical impedance spectroscopy (EIS in NaCl and acid and alkaline media under identical experimental conditions. The present study demonstrated that the nanozeolite coating can be a potential alternative for toxic and carcinogenic chromate coating.

  14. Synthesize and characterization of a novel anticorrosive cobalt ferrite nanoparticles dispersed in silica matrix (CoFe2O4-SiO2) to improve the corrosion protection performance of epoxy coating

    Science.gov (United States)

    Gharagozlou, M.; Ramezanzadeh, B.; Baradaran, Z.

    2016-07-01

    This study aimed at studying the effect of an anticorrosive nickel ferrite nanoparticle dispersed in silica matrix (NiFe2O4-SiO2) on the corrosion protection properties of steel substrate. NiFe2O4 and NiFe2O4-SiO2 nanopigments were synthesized and then characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscope (TEM). Then, 1 wt.% of nanopigments was dispersed in an epoxy coating and the resultant nanocomposites were applied on the steel substrates. The corrosion inhibition effects of nanopigments were tested by an electrochemical impedance spectroscopy (EIS) and salt spray test. Results revealed that dispersing nickel ferrite nanoparticles in a silica matrix (NiFe2O4-SiO2) resulted in the enhancement of the nanopigment dispersion in the epoxy coating matrix. Inclusion of 1 wt.% of NiFe2O4-SiO2 nanopigment into the epoxy coating enhanced its corrosion protection properties before and after scratching.

  15. Anticorrosion properties of water-based polyaniline/fluorocarbon composite emulsion coatings%水性聚苯胺/氟碳复合乳液涂层的防腐蚀性能

    Institute of Scientific and Technical Information of China (English)

    李玉峰; 曾照坡; 王迪

    2012-01-01

    Water-based polyaniline ( PANI ) emulsions were synthesized use dodecylbenzene sulfonic acid ( DBSA ) as emulsifier and doping agent, X-ray diffraction (XRD) showed DBSA doped PANI molecular chain had good stretch. Particle size test showed PANI latex particles had uniform distribution and the average particle size was about 250nm. Then make the water-based composited emulsion coatings with PANI emulsion and fluorocarbon emulsion (FC), the anticorrosion property to Q235 mild steel were discussed by electrochemical impedance spectroscopy( EIS ), Tafel polt( Tafel ) and open circuit potential( OCP ). The results showed the PANI/FC composite emulsion coatings had higher impedance and corrosion potential ( -0.4V ) , the corrosion current density was lower ( 10-6A/cm2 ). The composite coatings had better anticorrosion properties to Q235 mild steel while m( PANI ) : m( FC ) =1:1.%以十二烷基苯磺酸(DBSA)为乳化剂和掺杂剂,制备了水性聚苯胺(PANI)乳液,X射线衍射分析(XRD)结果表明,DBSA掺杂的PANI分子链伸展性较好;粒径测试结果表明聚苯胺乳胶粒子分布均匀,平均粒径约为250nm。冉以水性氟碳(FC)乳液为成膜物制备了水性PANUFC复合乳液涂层材料,利用电化学交流阻抗谱(EIS)、Tafel曲线(Tafel)、平衡开路电位(OCP)考察了其对Q235低碳钢的防腐蚀性能。结果表明,PANI/FC复合乳液涂层具有较高的阻抗.显著地提高了金属的腐蚀电位(-0.4V),降低了金属的腐蚀电流密度(10-6A/cm2)。当m(PANI):m(FC)=1:1时,复合涂层对Q235碳钢的防腐蚀性能最好。

  16. 纳米二氧化硅改性有机硅-环氧防腐涂料的合成与性能研究%Preparation and characterization of organic silicon-epoxy anti-corrosive coating modified by nanosilica

    Institute of Scientific and Technical Information of China (English)

    李慧博; 张秀玲

    2011-01-01

    本文利用带羟基的有机硅预聚体与双酚A型环氧树脂反应,制备有机硅-环氧树脂及涂层,并采用纳米SiO2改性有机硅-环氧.采用扫描电镜、硬度、冲击强度、附着力、柔韧性、电化学防腐特性等分析手段,考察了有机硅用量变化、纳米SiO2等对涂膜性能的影响,发现当环氧树脂有机硅用量比为2:1时,有机硅改性环氧涂层综合了有机硅树脂和环氧树脂的优异性能,既有好的附着力,又有好的耐老化性能和防腐特性.在有机硅改性环氧涂层中加入纳米SiO2溶液,原位聚合获得纳米SiO2改性有机硅-环氧涂层.与有机硅改性环氧涂层相比,纳米改性有机硅-环氧涂层具有优异的紫外屏蔽特性和耐老化性能.%The organic silicon- epoxy anti-corrosive coating was prepared by organic silicon performed polymer with hydroxyl and bisphenol A type epoxy resin. The nanosilica was adopted to modify organic silicon-epoxy. The effect of amount of organic silicon and nanosilica to performance of coating was investigated by SEM, hardness, impact strength, adhesion, flexibility and electrochemical anticorrosion. It was found that when the ratio of epoxy resin and organic silicon was 2:1, the organic silicon-epoxy anti-corrosive coating has good adhesion, resistance to aging and anticorrosive. The organic silicon-epoxy anti-corrosive coating modified by nanosilica was synthesized by adding nanosilica solution to organic silicon modified epoxy coating. Compared to organic silicon modified epoxy coating, the organic silicon -epoxy anti -corrosive coating modified by nanosilica has good uvioresistant and resistance to aging.

  17. Anti-corrosion properties of Ni-P alloy coated on engine cylinder prepared from jet electrodeposion%发动机气缸电喷镀镍磷合金镀层及耐腐蚀性能

    Institute of Scientific and Technical Information of China (English)

    王颖; 康敏; 傅秀清; 王兴盛

    2014-01-01

    Cylinder is the important part of tractor engine, which service life and the production cost are directly affected by anti-corrosion of the component. With the excellent wear resistance, corrosion resistance and higher hardness, Ni-P alloy deposited layer plays an important role for enhance the service life and reliability of cylinder, and the capability and quality of the tractor engine can be improved. Because of severe working environment of cylinder and piston such as high temperature, high load, high-velocity motion, poor lubrication, difficult cooling, especially weak acid for work environment, it is advisable to study the anti-corrosion properties of Ni-P alloy coated on engine cylinder. However, with the advancement of social economy, the conventional method for electrodeposited Ni-P alloy fails to meet the requirements of the development due to lower depositing rate and lower production efficiency. The jet electrodeposition is developed in recent years, which can significant increase the production efficiency because jet electrolyte can accelerate transfer process of the electrodeposition material and augment limiting current density. So the jet electrodeposition is a kind of high-velocity, selective electrodeposition technique with high deposition current density. In this paper, the engine cylinder coated with Ni-P alloy with jet electrodeposition was taken as research object. The surface appearance of deposited layer was observed by 6XB-PC reflective optical microscope. The corrosion behavior of Ni-P alloy coated on cylinder in 50 g/L NaCl solutions at different moment was studied by electrochemical impedance spectroscopy and potentiodynamic polarization method. The results show that the coating surface appearance is dense and smooth. Electrochemical impedance spectroscopy is composed of high and low frequency arcs when the layer immersed in 50 g/L NaCl solutions with 0.5, 1, 6, 12 and 24 h. The high frequency arcs have relation with original oxidation

  18. Research and Performance Evaluation on the Waterborne Anticorrosive Coatings for Bridge Bump Wall%桥梁防撞墙抗腐蚀用水性防腐涂料的研制及性能评价

    Institute of Scientific and Technical Information of China (English)

    张帅; 杜素军

    2015-01-01

    In recent years, the issue of corrosion of curbs and bridge bump wall on both sides of highway by snow melting agent has gotten more and more serious, and it has gradually become a major dififculty in highway maintenance that the concrete is corroded and damaged resulting from clearance of accumulated snow with snow melting agent. A kind of waterborne concrete anticorrosion coatings based on the polyurethane modiifed epoxy resin, such performances of the coatings as water resistance, corrosion resistance, weather fastness and adhesiveness, etc. are researched, and the paint is applied. Thus, the purpose of limiting the highway concrete corrosion by snow melting agent is achieved.%近年来,高速公路两侧路缘石及桥梁防撞墙受融雪剂腐蚀的问题越来越严重,融雪剂清理积雪造成的混凝土腐蚀破坏逐渐成为高速公路养护的重大难点。以聚氨酯改性环氧树脂为基料开发了一种水性混凝土防腐涂料,研究了涂料的耐水性、耐腐蚀性、耐候性、附着力等性能,并对涂料进行施工应用,达到限制融雪剂对高速公路混凝土腐蚀的目的。

  19. Research and Application of Two Different Anti-corrosion coating Systems on Tidal current Generator%两种防腐蚀涂层体系在潮流发电机组上的应用研究

    Institute of Scientific and Technical Information of China (English)

    李景; 贾朋刚; 过洁; 王辉亭

    2013-01-01

    Marine current is an important offshore source of renewable energy. Marine current turbine generator is one kind of facility which converts marine current energy into electric energy. Generally, marine current turbine generator works in offshore field with high speed of marine current, which always encounters challenges of serious corrosion and biofouling in marine environment. In this paper, two different kinds of coating systems have been tested and utilized to paint the main parts of tidal current generator. The results tested in laboratory and in sea indicate that these two coating systems show good anti-corrosive property.%  潮流能是一种重要的海洋可再生能源。潮流能发电机组是一种将潮流能转化为电能的装置。潮流能发电机组一般运行在海流流速较大的近海海域,面临着海水腐蚀,微生物附着等因素的严重影响。本文分析了两种防腐蚀涂层体系的各项性能参数,在潮流能发电机的各主要部件外表面进行了涂装,并且进行了海试。实验室检验结果和海试结果表明,两种涂层均表现出良好的耐腐蚀效果。

  20. Advanced anticorrosive coatings prepared from electroactive polyimide/graphene nanocomposites with synergistic effects of redox catalytic capability and gas barrier properties

    Directory of Open Access Journals (Sweden)

    J. M. Yeh

    2014-04-01

    Full Text Available In this study, electroactive polyimide (EPI/graphene nanocomposite (EPGN coatings were prepared by thermal imidization and then characterized by Fourier transformation infrared (FTIR and transmission electron microscope (TEM. The redox behavior of the as-prepared EPGN materials was identified by in situ monitoring for cyclic voltammetry (CV studies. Demonstrating that EPGN coatings provided advanced corrosion protection of cold-rolled steel (CRS electrodes as compared to that of neat EPI coating. The superior corrosion protection of EPGN coatings over EPI coatings on CRS electrodes could be explained by the following two reasons. First, the redox catalytic capabilities of amino-capped aniline trimer (ACAT units existing in the EPGN may induce the formation of passive metal oxide layers on the CRS electrode, as indicated by scanning electron microscope (SEM and electron spectroscopy for chemical analysis (ESCA studies. Moreover, the well-dispersed carboxyl-graphene nanosheets embedded in the EPGN matrix hinder gas migration exponentially. This would explain enhanced oxygen barrier properties of EPGN, as indicated by gas permeability analysis (GPA studies.

  1. Ceramic nanotubes for polymer composites with stable anticorrosion properties

    Science.gov (United States)

    Fakhrullin, R. F.; Tursunbayeva, A.; Portnov, V. S.; L'vov, Yu. M.

    2014-12-01

    The use of natural halloysite clay tubes 50 nm in diameter as nanocontainers for loading, storing, and slowly releasing organic corrosion inhibitors is described. Loaded nanotubes can be mixed well with many polymers and dyes in amounts of 5-10 wt % to form a ceramic framework (which increases the strength of halloysite composites by 30-50%), increase the adhesion of these coatings to metals, and allow for the slow release of corrosion inhibitors in defects of coatings. A significant improvement of protective anticorrosion properties of polyacryl and polyurethane coatings containing ceramic nanotubes loaded with benzotriazole and hydroxyquinoline is demonstrated.

  2. The implementation and application of chemical cleaning and anti-corrosive coating of the condenser%凝汽器化学清洗及防腐镀膜的实施及应用

    Institute of Scientific and Technical Information of China (English)

    田红艳

    2011-01-01

    影响发电机组安全运行的因素有很多,凝汽器铜管的腐蚀就是其中之一。凝汽器铜管一旦发生腐蚀泄漏,冷却水便会漏入凝结水中,从而导致锅炉、汽轮机等设备的腐蚀与结垢。对凝汽器铜管进行化学清洗及防腐镀膜,可以有效阻止或缓解各类腐蚀,延长凝汽器使用寿命,减少因铜管泄漏造成的紧急停机、凝结水浪费、锅炉结垢,避免设备提前更换、甚至安全事故等风险。大大延长铜管的使用寿命,有利于凝汽器安全经济运行。%There are many factors in influencing the safe operation of the generator, and corrosion of the condenser copper pipe is one of them. Once the corrosion and leakage of the condenser copper pipe happened, it will lead to cooling water leak into the condensed water, and the corrosion and fouling of boiler and turbine was thereby produced. If the condenser copper pipe were dealt with the chemical cleaning and anti-corrosive coating, some risks will be reduced. Then kinds of corrosion can be effectively prevented or alleviated, service life of the condenser can be prolonged, emergency stop, condensed water waste and boiler scale caused by copper tube leakage will be reduced, replacement of the equipments in early, even accidents will avoid. Greatly extend the service life of the copper pipe will benefit to the safe and economical operation of the condenser.

  3. Utmost Protective Life of Arc Spray Al Coating and Large Area Long Term Anti-corrosion for Steel Box Girder Bridge%电弧喷铝涂层的保护极限及钢箱梁桥大面积长效防腐

    Institute of Scientific and Technical Information of China (English)

    陈建阳; 肖跃文; 李雄晖; 沈承金

    2001-01-01

    结合武汉军山长江公路大桥钢箱梁防腐,分析大气腐蚀环境和影响因素,研究电弧喷铝涂层腐蚀失效机理和耐腐蚀性,确定电弧喷铝涂层有效保护的极限涂层厚度和极限涂层破损率,并针对钢箱粱桥特点,设计制作机械化电弧喷涂设备,进行大面积长效防腐施工。%In terms of the protective for steel box girder of Wuhan Junshan Changjiang Bridge, atmospheric corrosion environment and influencing factors are analyzed, invalidation mechanism of are spray Al coating due to corrosion and ability for anti-corrosion are studied, utrnost thickness of arc spray Al coating for effective protection and utmost breakage rate of coating are determined. Automatic arc spray equipments are designed and made for large area long term anti-corrosion.

  4. The history and future of thermal sprayed galvanically active metallic anticorrosion coatings used on pipelines and steel structures in the oil and gas industry

    Energy Technology Data Exchange (ETDEWEB)

    Rodijnen, Fred van [Sulzer Metco, Duisburg (Germany)

    2008-07-01

    Since its invention by M. U. Schoop in the beginning of the 20th century, thermal spray has been used for corrosion protection applications in naval, on-shore, submerged and atmospheric environments. Thermally sprayed coatings of zinc, zinc alloys, aluminum and aluminum alloys are currently the most popular materials used for active corrosion protection of steel and concrete, which can be applied using either of the widely known thermal spray processes of combustion wire or electric arc wire. In the oil and gas exploration and production industry, corrosion protection applications using these technologies have evolved since the early sixties. Thermal spray technology has successfully been used to protect steel-based materials from corrosion in many different fields of application like platforms and pipelines. The most used material in the oil and gas industry is TSA (Thermally Sprayed Aluminum) coating. TSA coatings, with a lifetime of 25 to 30 years, require no maintenance except for cosmetic reasons when painted. The surface temperature of a TSA can go as high as 480 deg C. Although TS (Thermal Spray) is an older process, the number of applications and the number of m{sup 2} it is applied to is still increasing resulting from its maintenance-free and reliable active corrosion-protection features. (author)

  5. Anti-corrosion and wear properties of plasma electrolytic oxidation coating formed on high Si content Al alloy by sectionalized oxidation mode

    Science.gov (United States)

    Dai, Libin; Li, Wenfang; Zhang, Guoge; Fu, Nianqing; Duan, Qi

    2017-01-01

    In this study, a uniform and less defective ceramic coating was prepared on high Si content aluminium alloys by a sectionalized plasma electrolytic oxidation (PEO) mode. The PEO process of Al-9 wt. % Si binary alloy was performed under constant current mode followed by constant voltage mode. The surface micrographs and chemical compositions of different samples were analysed by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Micro-hardness and reciprocal-sliding testers were used to measure the coatings hardness and tribological performance. It was found that the sectionalized PEO mode could produce hard and anti-friction passive oxide layers with smaller holes and fewer cracks on the Al-Si alloy, comparing with the single constant current mode. In addition, the results of polarization curves and electrochemical impedance spectroscopy (EIS) tests conducted in 3.5 wt. % NaCl solution revealed that the coatings obtained by sectionalized PEO mode had a higher corrosion resistance and provided better corrosion protection for Al-Si alloy.

  6. 用于蒸馏水舱防护的新型玻璃鳞片涂料研制%Study on epoxy glass flake heavy-duty anticorrosive coatings used in distilled water carbin

    Institute of Scientific and Technical Information of China (English)

    康新征; 张赞; 周陈亮

    2011-01-01

    Currently,the internal wall of distilled water cabin was protectived by using epoxy polyamide paint as a protective coating to prevent the bulkhead corrosion,but then protection period is only five years or so.Such protective coating is not only short-term effect,but only film is easy to produce blister and fall off.A new high-solids epoxy glass flake coating was manufactured using silicone-coated sheet glass flake as the main anti -rust paint,low viscosity epoxy resin-based material as basic resin.The test indicated that the coating resistance to neutral salt spray test was up to 3000 hours,and at room temperature,in distilled water environment,the effective protection period was up to 15 years,and after long-term soaking in distilled water,erosion,there will be no dissolution of soluble material in the filim.that will not affect the storage of distilled water,the water tanks and other equipment of the wall protection using the coating will be suitable for long-term storage of high purity distilled water,that can effectively meet anti-corrosion requirements of the submarines,power plants and other departments of the distilled water storage facilities.%舰艇蒸馏水舱内壁主要使用环氧聚酰胺类涂料作为防护涂层,防止舱壁腐蚀,防护期限一般为5年左右。但这类涂料不仅防护期效短,而且在使用过程中涂膜易产生起泡、脱落。以硅氧烷包覆过的片状玻璃鳞片为主要防锈涂料,以低黏度环氧树脂为基料,制备了一种新型高固体份环氧玻璃鳞片涂料。实验表明,该涂料耐中性盐雾试验可达3000h以上;常温条件下,在蒸馏水浸泡环境中,涂膜的有效防护期可达15年以上;并且经长期的蒸馏水浸泡、侵蚀,漆膜不会有可溶物质溶出,不会影响存储的蒸馏水水质,非常适合于长时间存储高纯度蒸馏水的水柜、水罐等设备的内壁防护需要,可有效满足舰艇、电厂等对蒸馏水存储设施的防腐要求。

  7. Smart Mesoporous Silica Nanocapsules as Environmentally Friendly Anticorrosive Pigments

    Directory of Open Access Journals (Sweden)

    C. Zea

    2015-01-01

    Full Text Available Nowadays there is a special interest to study and develop new smart anticorrosive pigments in order to increase the protection life time of organic coatings and, simultaneously, to find alternatives to conventional toxic and carcinogenic hexavalent chromium compounds. In this respect, the great development of nanotechnologies in recent years has opened up a range of possibilities in the field of anticorrosive paints through the integration of encapsulated nanoscale containers loaded with active components into coatings. By means of a suitable design of the capsule, the release of the encapsulated corrosion inhibitor can be triggered by different external or internal factors (pH change, mechanical damage, etc. thus preventing spontaneous leakage of the active component and achieving more efficient and economical use of the inhibitor, which is only released upon demand in the affected area. In the present work, the improved anticorrosive behaviour achieved by encapsulated mesoporous silica nanocontainers filled with an environmentally friendly corrosion inhibitor has been evaluated. It has been proven that a change in the pH allows the rupture of the capsules, the release of the inhibitor, and the successful protection of the carbon steel substrate.

  8. Application of Pipeline Current Mapping Technology in Anti-corrosion Coating Detection of Underground Gas Pipeline%管道电流测绘技术在地下燃气管道防腐层检测中的应用

    Institute of Scientific and Technical Information of China (English)

    黄奕昶; 杨博; 李炜; 黄琴

    2016-01-01

    城镇地下燃气管道的运行状况直接关乎城镇的安全。管道电流测绘技术可以在非开挖条件下对埋地管道的阴极保护有效性做出评价,有效地检测出埋地钢质管道外防腐层缺陷。在工程应用中,采用这种新颖的检测技术可以快速检测和定位某处地下燃气管道的外防腐层缺陷。%The running state of theurban underground gas pipeline is crucial to the city safety. The pipeline current mapping technology is able to evaluate the effectiveness of the cathodic protection of the underground pipeline without excavation and effectively detect the defects of the anti-corrosion coating of the underground steel pipeline. In engineering application, the defects of the anti-corrosion coating of the underground gas pipeline can be detected and located rapidly by using this new detection technology.

  9. Influence on the anticorrosive properties of the use of erbium (III) trifluoromethanesulfonate as initiator in an epoxy powder clearcoat

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, S.J. [Centro de Biomateriales, Universitat Politecnica de Valencia, Camino de Vera s/n, E-46071 Valencia (Spain)]. E-mail: sangares@upvnet.upv.es; Suay, J. [Centro de Biomateriales, Universitat Politecnica de Valencia, Camino de Vera s/n, E-46071 Valencia (Spain)

    2007-08-15

    New low curing temperature epoxy powder coatings cured cationically by the use of erbium (III) trifluoromethanesulfonate as initiator have been formulated. Their curing kinetics and anticorrosive properties have been studied and compared with a system commonly used in industry (o-tolylbiguanide/epoxy resin). Three different tests of anticorrosive properties (EIS, AC/DC/AC, and salt fog spray) have been used together with an adherence test, in order to establish the optimal system. Results show that a system employing 1 phr of erbium triflate presents good anticorrosive properties. The technique AC/DC/AC has shown its ability to evaluate properly, much faster, and in accordance to anticorrosive properties results' of powder coatings obtained by other techniques.

  10. 仿生自修复防腐涂层的研究进展%Recent Progress in Self- healing Anticorrosion Coatings

    Institute of Scientific and Technical Information of China (English)

    曲爱兰

    2012-01-01

    Self - healing is receiving an increasing amount of worldwide interest as a method to address the bionic healing for damages in materials. The technical methods to realize the self - healing function were introduced in this paper. Based on the analysis of effects on self - healing, some principles to choose the system of microencapsulation and repairing - agents were discussed. Recent developments in the fabrication of nanocontainers and encapsulation of different active components that were used in protective coatings were reviewed. And the advantages and disadvantages of several approaches were discussed. Finally, the challenges and future possible scenarios are highlighted.%介绍了实现材料仿生自修复功能的技术方法,在分析影响材料自修复效率因素的基础上,总结了选择微胶囊和修复剂体系应遵循的原则,综述了自修复防腐涂层中的最新研究成果,并指出自修复涂层目前存在的问题及今后研究的方向.

  11. Anti-corrosion performance of dodecylbenzenesulfonate acid redoping polyaniline/epoxy-silicone composite coatings%十二烷基苯磺酸二次掺杂聚苯胺/环氧有机硅复合涂层的防腐性能∗

    Institute of Scientific and Technical Information of China (English)

    贾艺凡; 刘朝辉; 廖梓珺; 叶圣天; 王飞

    2016-01-01

    以自制的十二烷基苯磺酸二次掺杂聚苯胺为防腐颜料,制备质量分数为0.5%,1.0%及1.5%的十二烷基苯磺酸二次掺杂聚苯胺/环氧有机硅复合涂层,利用扫描电子显微镜观察不同掺量十二烷基苯磺酸二次掺杂聚苯胺在环氧有机硅涂层中的分散状态,并通过开路电位、电化学阻抗谱及Tafel曲线对比分析涂层的耐腐蚀性能.结果表明,十二烷基苯磺酸二次掺杂聚苯胺添加量为1.0%时,其在环氧有机硅涂层的分散均匀且致密,并在3.5%(质量分数)NaCl溶液中浸泡后对 Q235低碳钢表现出良好的防腐效果.%The epoxy-silicone composite coatings was prepared by the anti-corrosion pigment of dodecylbenzene sulfonate acid redoping polyaniline,mass fraction of it was 0.5%,1.0%,1.5%.SEM tests were carried out to observe dispersed state of different quantity of dodecylbenzene sulfonate acid redoping polyaniline in the epoxy-silicone composite coatings,and their anti-corrosion properties were studied by means of open circuit potential, electrochemical impedance spectroscopy and Tafel curves.The results indicated that the coatings with 1 .0% do-decylbenzene sulfonate acid redoping polyaniline were uniformly dispersed and density,which had the best anti-corrosion performance on Q235 mild steel in NaCl (3.5wt%)solution.

  12. Effect of Reaction Temperature and pH Value on Performances of Polyaniline/Epoxy Resin Composite Anti-corrosion Coatings%反应温度及pH值对聚苯胺/环氧树脂涂料防腐性能的影响

    Institute of Scientific and Technical Information of China (English)

    郝少娜; 甘孟瑜; 冯利军; 杨桔; 李志春; 贾春悦; 刘兴敏

    2011-01-01

    采用原位乳液聚合法,合成了聚苯胺/环氧树脂(PAn/EP)复合涂料,研究了聚合反应温度及体系pH值对其防腐性能的影响,并探讨了其防腐机理.结果表明,当反应温度为25℃、体系中PH=1时合成的PAn/EP复合涂料的防腐效果较好,并明显优于商品PAn/EP混合涂料.%The effects of reaction temperature and pH value on the corrosion resistance of polyaniline/epoxy resin (PAn/EP) composite coatings, which were prepared by chemical in-situ polymerization, were investigated by Tafel measurement. And the anti-corrosion mechanism of polyaniline/epoxy resin composite coatings was also discussed. The experimental results show that when the reaction temperature is 25 ℃ and the pH value is 1, the corrosion resistance of the composite coating is satisfactory, and it is better than PAn/EP mixed coatings.

  13. 离子交换型缓蚀填料在防腐蚀涂层中的应用Ⅰ阳离子交换型填料%Application of Ion-exchange Compounds as Corrosion Inhibiting Pigments to Organic Anticorrosion Coatings Ⅰ Cation-exchange Pigments

    Institute of Scientific and Technical Information of China (English)

    吴俊升; 肖葵; 李欣荣; 董超芳; 李晓刚

    2011-01-01

    铬酸盐等重金属类缓蚀性颜填料会对环境造成严重的污染,未来该类有害物质在防腐蚀涂层中的应用将被禁止。新型的离子交换型填料因其具有可同时释放缓蚀性离子和吸附固定侵蚀性离子(H+、Cl-、SO24-等)的双重功效,被认为是替代传统重金属类颜填料的理想材料。本文对Zn2+、Ce3+、Ca2+等缓蚀性阳离子改性膨润土、氧化硅、分子筛等新型离子交换型缓蚀填料在有机防腐蚀涂层中的应用进行了综述。%It is well documented that chromate pigments and other heavy metal compounds must be eliminated from organic anticorrosion coatings due to their toxic nature and carcinogenic effects in the future. The novel ion-exchange pigments can play a double role of absorbing the harmful ions such as H+ ,C1- ,SO24- and releasing the inhibiting ions on contact with aggressive electrolyte invading the coating. The released inhibitors can provide active corrosion protection to the defects in the coating and substrate, on the other hand, the uptake of harmful ions decreases the aggressiveness of the corrosive medium, and thereby reduces the rate of ecorrosion processes. Therefore, such new inhibiting compounds have been developed as the potential alternate materials of the traditional toxic pigments, and have attracted a lot of attention. In this paper, the application of ion-exchange pigments, such as Ce3+ , Znz+ cation-exchanged bentonite, Ca2+ cation-exchanged silica and MoO22+ cation-exchanged zeolite, to organic anticorrosion coatings is reviewed.

  14. 离子交换型缓蚀填料在防腐蚀涂层中的应用Ⅱ阴离子交换型填料%Application of Ion-exchange Compounds as Corrosion Inhibiting Pigments to Organic Anticorrosion Coatings Ⅱ Anion-exchange Pigments

    Institute of Scientific and Technical Information of China (English)

    吴俊升; 肖葵; 李欣荣; 董超芳; 李晓刚

    2011-01-01

    铬酸盐等重金属类缓蚀性颜填料会对环境造成严重的污染,未来该类有害物质在防腐蚀涂层中的应用将被禁止.新型的离子交换型填料因其具有可同时释放缓蚀性离子和吸附固定侵蚀性离子(H+、Cl-、SO2-4等)的双重功效,被认为是替代传统重金属类颜填料的理想材料.本文对[V10O28]6-、MoO2-4等缓蚀性阴离子改性水滑石类层状新型离子交换型缓蚀填料在有机防腐蚀涂层中的应用进行综述.%It is well documented that chromate pigments and other heavy metal compounds must be eliminated from organic anticorrosion coatings due to their toxic nature and carcinogenic effects in the future. The novel ion-exchange pigments can play a double role of absorbing the harmful ions such as H+ , Cl- , SO2-4 and releasing the inhibiting ions on contact with aggressive electrolyte invading the coating. The released inhibitors can provide active corrosion protection to the defects in the coating and substrate. On the other hand, the uptake of harmful ions decreases the aggressiveness of the corrosive medium, and thereby reduces the rate of corrosion processes. Therefore, such new inhibiting compounds have been developed as the potential alternate materials of the traditional toxic pigments, and have attracted a lot of attention. In this paper, the application of anion-exchange pigments, such as [V10O28]6- , MoO2-4 exchanged hydrotalcite, in organic anticorrosion coatings is reviewed.

  15. Sericite modified by Cr2O3 / KH-550 and its effection on the anticorrosion properties of epoxy resin coating%Cr2O3/KH-550改性绢云母及其对环氧涂料防腐性能的影响

    Institute of Scientific and Technical Information of China (English)

    高延敏; 袁浩; 王晓艳

    2012-01-01

    采用有机-无机复合改性方法对片状绢云母表面进行了改性,考察了改性绢云母对环氧涂料防腐性能的影响.采用扫描电镜(SEM)、X-射线衍射(XRD),电化学工作站等对改性绢云母表面的物理化学性能进行了表征.结果表明:绢云母表面的防腐性能得到了改善,绢云母表面引入一层Cr2O3,当Cr2O3的用量为绢云母的60%时改性效果最佳,用KH - 550 进一步改性后的绢云母疏水亲油性比单独用Cr2O3改性的绢云母有了提高,而且腐蚀电位明显提高,自腐蚀电流大大减小,说明该涂层可使腐蚀速度减小,有较好的保护作用.%Sericite has some shortcomings including hydrophilic dredging oil, easy reunion and difficult wetting and distracting in organic coating. By using ganic-inorganic compound, sericite is modified, and its influence on anticorrosion properties of epoxy paint is further investigated. Moreover, the physical and chemical characteristics of surface-modified sericite are analyzed by scanning electron microscope (SEM)、X-ray diffraction (XRD) and electrochemical analysis. The results show that the anticorrosion performance of sericite surface is improved, and it is equably covered with a layer of Cr2O3. When the dosage of chromic nitrate accounts for 60% of sericite, the wrapping effect is good. The hydrophilic oleophobic characteristics of sericite that is coated with KH -550 again after being modified with Cr2O3 is enhanced largely. Also, corrosion potential is improved obviously, and corrosion current is decreased greatly. This means that the coating reduces the corrosion speed and has a good protection.

  16. 氟硅丙烯酸酯/钠基蒙脱土复合乳胶涂层的制备及防腐蚀性能%Preparation and anticorrosion performance of fluorine-silicon-acrylate/sodium montmorillonite composite emulsion coating

    Institute of Scientific and Technical Information of China (English)

    高晓辉; 李玉峰; 祝晶晶; 张毅志

    2015-01-01

    以甲基丙烯酸十二氟庚酯和乙烯基三甲氧基硅烷为功能单体,采用种子乳液聚合法合成氟硅丙烯酸酯乳液(氟硅),然后将钠基蒙脱土(钠土)分散于其中,制成复合乳胶涂层并涂覆在Q235钢上。研究了乳液种类和钠土用量对涂层防腐性的影响。采用红外光谱(FT-IR)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)表征了氟硅丙烯酸酯乳液和涂层。通过极化曲线、交流阻抗测量和中性盐雾试验探讨了复合涂层的耐腐蚀性。结果表明,乳胶粒子呈核壳结构,涂层连续、致密,钠土在涂层中分散均匀。当钠土用量为4%时,复合涂层的耐蚀性最好,水接触角达到102.4°,附着力为0级,电化学阻抗达到104.4Ω,腐蚀速率仅为4.3×10−5 mm/a,盐雾试验240 h后膜下金属未发生腐蚀扩散。%A fluorine-silicon-acrylate emulsion was synthesized by seed emulsion polymerization using dodecafluoroheptyl methacrylate and vinyltrimethoxysilane as monomers. Sodium montmorillonite (Na-MMT) was dispersed in the fluorine-silicon-acrylate emulsion for preparing a composite emulsion coating for Q235 steel. The influences of emulsion type and Na-MMT content on anticorrosion properties of the coating were studied. The fluorine-silicon-acrylate emulsion and coating were characterized by Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The corrosion resistance of the composite coating was examined by polarization curve measurement, electrochemical impedance spectroscopy, and neutral salt spray test. The results showed that the emulsion particles possess obvious core-shell structure and the composite coating is continuous and compact with well-dispersed Na-MMT. The composite emulsion coating obtained with 4%Na-MMT has optimal anticorrosion performance with a water contact angle of 102.4°, adhesion strength of 0 grade

  17. 无溶剂环氧重防腐隔热导静电涂料的研制%Preparation of Solventless Epoxy Heavy Anti-corrosion Insulation Conducting Electrostatic Coating

    Institute of Scientific and Technical Information of China (English)

    刘成楼; 隗功祥

    2012-01-01

    以丙烯酸改性环氧树脂为基料,以反应型和非反应型稀释剂为溶剂、以液态聚硫橡胶为增韧剂,在功能颜填料和助剂的配合下制备成甲组分;以腰果壳液合成的改性胺为固化剂,在促进剂和亲水剂配合下组成乙组分。固化后的涂层柔韧、致密,具有重防腐、隔热隔音、导静电性能。%Component I was prepared by using acrylic modified epoxy resin used as binder and reactive and nonreactive diluents as solvent, liquid polysulfide rubber as toughening agents, functional pigments and extender and additives; component Ⅱ was prepared by using modified amine synthesized by cashew nut shell liquid as curing agent, assorted with promoting agents and hydrophilic agent. After curing, the film flexible and compact, with heavy anti-corrosion, heat insulation, sound insulation, conducting electrostatic properties.

  18. 钢基体表面可溶盐对氯化橡胶涂层耐蚀性的影响%EFFECT OF SOLUBLE SALTS OF STEEL SURFACE ON ANTI-CORROSIVE PROPERTIES OF CHLORINATED RUBBER COATING

    Institute of Scientific and Technical Information of China (English)

    贺囿策; 俞宏英; 金莹; 孙冬柏

    2012-01-01

    The experiment invested the effect of soluble salts content of substrate surface on the anti- corrosive properties of the coating by GB/T 10834-2008 and ASTM D870-02 standards, and corrosion results were evaluated according to the GB/T 1766-2008 specification. Besides, the morphologies of the coating after immerged were observed by SEM. The result shows that the time order of visible damage of the coating is blistering, flaking and rusting respectively. It is more permeative of the deionized water used by ASTM standard than the salt water used by GB due to the existence of soluble salt on the matrix, which has great attack on the coating. The range of soluble salt changes from 28.02 mg/m^2 to 43.92 mg/m^2, which makes the coating damage dramatically, so we think the threshold value is about 43.92 mg/m^2.%用GB/T10834—2008和ASTMD870—02标准,考察了基体表面不同可溶性盐含量对氯化橡胶涂层耐蚀性能的影响,根据GB/T1766—2008对浸泡后涂层进行腐蚀等级评定,并用SEM观察涂层腐蚀形貌。结果表明:试样涂层明显可见的破坏方式的时间顺序依次是起泡、剥落和锈蚀;由于基体表面存在可溶性盐,使得ASTM标准中使用的去离子水比GB标准中使用的盐水对涂层的破坏更严重,去离子水的渗透性更强;可溶性盐含量在28.02—43.92mg/m^2之间时是涂层破坏转变区间,可以认为43.92mg/m^2是临界值。

  19. Monodisperse Ag@SiO2 core-shell nanoparticles as active inhibitors for marine anticorrosion applications.

    Science.gov (United States)

    Zhang, Xin-Sheng; Wang, Jie-Xin; Xu, Ke; Le, Yuan; Chen, Jian-Feng

    2011-04-01

    Monodisperse Ag@SiO2 core-shell structured nanoparticles were firstly utilized as a novel corrosion inhibitor for marine anticorrosion applications. The related marine anticorrosion properties were evaluated with an electrochemical noise (ECN) analysis during 2 weeks of accelerated immersion tests in natural seawater with the addition of various inorganic salts and nutriments. The experimental results indicate that the corrosion activity is markedly reduced by nearly 1-3 orders of magnitude owing to the introduction of Ag@SiO2 core-shell nanoparticles into coating. The inhibition efficiency of corrosion can reach as high as about 99%. More importantly, such a coating exhibits an excellent long-term sustained marine anticorrosion effect. So it could be reasonably inferred that silver cores as active inhibitors effectively prevent the corrosion damage from microorganisms, while silica shells act as a good protection for silver nanoparticles, delay the release of silver ions, and also function as the corrosion inhibiting action for inorganic salts. Therefore, this would make monodisperse Ag@SiO2 core-shell nanoparticles a potential and promising corrosion inhibitor for developing future advanced multifunctional coatings.

  20. Optimization of the deposition process of corrosion resistant Stellite 6 coatings produced by laser cladding; Optimizacion del proceso de aporte de recubrimientos anticorrosion de Stellite 6 producidos mediante plaqueado laser

    Energy Technology Data Exchange (ETDEWEB)

    Vicario, I.; Soriano, C.; Sanz, C.; Bayon, R.; Leunda, J.

    2009-07-01

    Laser cladding is one of the most efficient surface treatment technologies in the industry. It uses a laser heat source to deposit a thin layer of a desired material on a moving substrate, whose properties have to be improved, achieving a metallurgical bonding between them with low heat affected zone and low dilution, compared to other conventional technologies such as PTA, TIG welding or thermal Spraying. In this sense, it is remarkable that there are 3 main application fields for laser cladding technology: restoration of refurbishment of damaged parts, surface coating against corrosion or wear, and rapid proto typing. the present work described a study of the optimization of the laser cladding of Co based coatings (Diamalloy 4060NS) on medium carbon steel C45 (AISI 1945). After laser treatment, the surface of the substrate materials is improved in terms of resistance against corrosion; this confirmed in the analysis performed afterwards. it is also shown that the corrosion barrier properties have direct correlation with the laser cladding variables. (Author) 10 refs.

  1. DM在航油管道外防腐层检测中的应用%The Application of DM at the External Anticorrosion Coating Detection of a Fuel Pipeline

    Institute of Scientific and Technical Information of China (English)

    陈智君; 李勇樊; 顾平

    2016-01-01

    本文通过研究各种管道检测技术的基本原理,对比了它们的优缺点,强调了综合检测技术的重要性。在此基础上介绍了DM(Defect Mapper)管道防腐层检测仪的基本原理和使用方法,并在某航油管道外防腐层检测中得到应用,获得良好的检测效果。%This paper introduced the basic principle of different pipeline detection technology and compared their advantages and disadvantages and emphasized the importance of comprehensive testing technology. We also introduced the basic principles and methods of DM pipeline coating detector. And get good results through its practical application in some jet fuel pipeline.

  2. Impact of heat treatment on surface chemistry of Al-coated Eurofer for application as anti-corrosion and T-permeation barriers in a flowing Pb-15.7Li environment

    Energy Technology Data Exchange (ETDEWEB)

    Konys, J., E-mail: juergen.konys@kit.edu [Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen (Germany); Krauss, W.; Holstein, N.; Lorenz, J.; Wulf, S. [Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen (Germany); Bhanumurthy, K. [Scientific Information Resource Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India)

    2012-08-15

    Highlights: Black-Right-Pointing-Pointer Electro-chemical Al deposition is industrially relevant for barrier formation. Black-Right-Pointing-Pointer Al scales have to be converted into protective layers by heat treatments. Black-Right-Pointing-Pointer Morphology of scales depend on deposition parameters. Black-Right-Pointing-Pointer Solid state diffusion step at 640 Degree-Sign C avoids critical Al melting and activates steel surface. Black-Right-Pointing-Pointer Al{sub 2}O{sub 3} protective scales detected. - Abstract: The compatibility testing of Eurofer steel in flowing Pb-15.7Li has shown that corrosion attack is a serious concern at least under view of precipitate formation from dissolved steel components in cooler system sections, leading to a high risk of tube blockages. Additionally, the T-permeation from the liquid breeder through the steel structure into the He-cooling system is an important safety issue. Both topics may be reduced by the application of barriers. Hot dip aluminization (HDA) showed that Al scales exhibit such ability but claimed also the development of improved coating technologies. Thus, two electro-chemically-based deposition processes, which exhibit industrial relevance and adjustable layer thickness of deposited Al, were developed, tested and characterized. Both are working with water-free electrolytes of toluene or ionic liquid (IL) base near room temperature (RT). The successfully deposited homogeneous layers need a heat treatment to establish the required protective/functional properties. During this stage, the Al reacts with the steel and forms an Al-enriched zone with a thin protective Al{sub 2}O{sub 3} surface scale. However, the topology is rough and pores are visible. Thus, for optimization of surface structure and scale quality, investigations concerning the required heat treatment were performed including effects coming from the applied coating technology.

  3. Experimental Study on the Electrochemical Anti-Corrosion Properties of Steel Structures Applying the Arc Thermal Metal Spraying Method

    Directory of Open Access Journals (Sweden)

    Hong-Bok Choe

    2014-12-01

    Full Text Available The arc thermal metal spraying method (ATMSM provides proven long-term protective coating systems using zinc, aluminum and their alloys for steel work in a marine environment. This paper focuses on studying experimentally the anti-corrosion criteria of ATMSM on steel specimens. The effects of the types of spraying metal and the presence or absence of sealing treatment from the thermal spraying of film on the anti-corrosion performance of TMSM were quantitatively evaluated by electrochemical techniques. The results showed that ATMSM represented a sufficient corrosion resistance with the driving force based on the potential difference of more than approximately 0.60 V between the thermal spraying layer and the base substrate steel. Furthermore, it was found that the sealing treatment of specimens had suppressed the dissolution of metals, increased the corrosion potential, decreased the corrosion current density and increased the polarization resistance. Metal alloy Al–Mg (95%:5% by mass with epoxy sealing coating led to the most successful anti-corrosion performance in these electrochemical experiments.

  4. Coating of long span bridges; Chotaikyo no toso

    Energy Technology Data Exchange (ETDEWEB)

    Kawanishi, H. [Nippon Paint Co. Ltd., Osaka (Japan)

    1998-11-15

    A composite anti-corrosion coating method (zinc rich primer + epoxy resin primer + polyurethane resin primer) was used for the Seto Ohashi Bridge. The anti-corrosion coating system in the Akashi Ohashi Bridge is the same as described above. This paper mainly describes the coating in a Honshu-Shikoku linking bridge. In the coating system, product blasting is used as rough coating. In the whole process, coating is basically performed at the factory. The anti-corrosion against a friction junction plane and splice plate is also carried out. For example, a rustproof bolt is used in the easy-to-corrode part. Coating is performed to obtain a thick film of more than 200 {mu}m. The edge of a member is rounded. The zinc dust in a zinc rich primer performs sacrifice anti-corrosion. The outside-air isolation film uses an epoxy resin primer that is excellent in water resistance and chemical resistance. This film improves the anti-corrosion effect by isolating the moisture or corrosive substance that permeates through the coated film from the outside air. If the weather resistance of the fluoroethylene resin primer used instead of a polyurethane resin primer has final coating quality as expected, the maintenance cycle in an offshore bridge can be more extended than the current cycle of about 10 to 15 years. 1 ref., 1 fig., 5 tabs.

  5. Environmentally Friendly Anticorrosion Coating for High Strength Fasteners

    Science.gov (United States)

    2011-01-01

    submersing it into a vat of paint. The basket is then raised above the paint surface and spun to remove the excess liquid by centrifugal action. The...PPG Industries, Inc. Cadmium Plating - Per QQ-P-416 Type II, Class 2 (Cd/Cr) Cadmium yellow with Chromium +6 rinse Embrittlement relief bake

  6. Fly ash based zeolitic pigments for application in anticorrosive paints

    Science.gov (United States)

    Shaw, Ruchi; Tiwari, Sangeeta

    2016-04-01

    The purpose of this work is to evaluate the utilization of waste fly ash in anticorrosive paints. Zeolite NaY was synthesized from waste fly ash and subsequently modified by exchanging its nominal cation Na+ with Mg2+ and Ca2+ ions. The metal ion exchanged zeolite was then used as anticorrosive zeolitic pigments in paints. The prepared zeolite NaY was characterized using X-Ray diffraction technique and Scanning electron microscopy. The size, shape and density of the prepared fly ash based pigments were determined by various techniques. The paints were prepared by using fly ash based zeolitic pigments in epoxy resin and the percentages of pigments used in paints were 2% and 5%. These paints were applied to the mild steel panels and the anticorrosive properties of the pigments were assessed by the electrochemical spectroscopy technique (EIS).

  7. Characterization and anticorrosion properties of carbon nanotubes directly synthesized on Ni foil using ethanol

    Science.gov (United States)

    Jeong, Namjo; Jwa, Eunjin; Kim, Chansoo; Hwang, Kyo Sik; Park, Soon-cheol; Jang, Moon Suk

    2016-07-01

    In this work, we describe the direct growth of carbon nanofilaments by the catalytic decomposition of ethanol on untreated polycrystalline Ni foil. Our work focuses on the effects of synthesis conditions on the growth of the carbon nanofilaments and their growth mechanism. Direct growth of carbon nanotubes (CNTs) is more favorable on lower-purity Ni foil. The highest yield was obtained at approximately 750 °C. The average diameter of the CNTs was approximately 20-30 nm. Raman spectra revealed that the increase of H2 concentration in the carrier gas and synthesis temperature induced the growth of better-graphitized CNTs. Additionally, we investigated the anticorrosion properties of as-prepared products under simulated seawater conditions. The corrosion rate of the CNT/Ni foil system was maximally 50-60 times slower than that of the as-received Ni foil, indicating that the CNT coating may be a good candidate for corrosion inhibition.

  8. Novel inorganic host layered double hydroxides intercalated with guest organic inhibitors for anticorrosion applications.

    Science.gov (United States)

    Poznyak, S K; Tedim, J; Rodrigues, L M; Salak, A N; Zheludkevich, M L; Dick, L F P; Ferreira, M G S

    2009-10-01

    Zn-Al and Mg-Al layered double hydroxides (LDHs) loaded with quinaldate and 2-mercaptobenzothiazolate anions were synthesized via anion-exchange reaction. The resulting compounds were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy/energy-dispersive X-ray spectroscopy. Spectrophotometric measurements demonstrated that the release of organic anions from these LDHs into the bulk solution is triggered by the presence of chloride anions, evidencing the anion-exchange nature of this process. The anticorrosion capabilities of LDHs loaded with organic inhibitors toward the AA2024 aluminum alloy were analyzed by electrochemical impedance spectroscopy. A significant reduction of the corrosion rate is observed when the LDH nanopigments are present in the corrosive media. The mechanism by which the inhibiting anions can be released from the LDHs underlines the versatility of these environmentally friendly structures and their potential application as nanocontainers in self-healing coatings.

  9. Evaluation of Mercaptobenzothiazole Anticorrosive Layer on Cu Surface by Spectroscopic Ellipsometry

    Science.gov (United States)

    Nishizawa, Hideaki; Sugiura, Osamu; Matsumura, Yoshiyuki; Kinoshita, Masaharu

    2007-05-01

    Mercaptobenzothiazole (MBT) anticorrosive layer on copper surface prepared in MBT solutions was analyzed by spectroscopic ellipsometry (SE). The results showed that MBT anticorrosive layer was formed on Cu2O layer in the MBT solution at temperatures higher than 50 °C. Additionally, it was confirmed that MBT anticorrosive layer was formed in the MBT solution at room temperature by adding about 20 wt % acetone to the solution. From polishing experiments of MBT anticorrosive layer and benzotriazole (BTA) layer, it was revealed that MBT anticorrosive layer was physically stronger than BTA layer. It is considered that dishing amount in Cu chemical-mechanical polishing (CMP) can be reduced by using MBT. However, MBT anticorrosive layer was not formed in the MBT solution including Hydrogen peroxide (H2O2) suggesting that slurry should be composed without H2O2 in order to use MBT for Cu CMP.

  10. Anti-corrosion Technology for Offshore Drilling Platform Fasteners%海洋平台紧固件防腐工艺探讨

    Institute of Scientific and Technical Information of China (English)

    黄建勋; 徐红九; 刘宏亮; 王明磊

    2013-01-01

    To achieve long and effective anti-corrosion of fasteners and standard parts of offshore drilling platforms and to solve the problem of corrosion caused by severe environment, the anti-corrosion technology of the KK1 # composite coating was proposed. The technology adopts the composite coating of " electrolytic zinc and Xylan paint" . It makes use of the self-lubricating property of the Xylan 1424 water paint dry film and the characteristic of frictional factor between 0. 05 and 0. 10. It has the advanced anti-salt spray corrosion performance and very strong anti-acid rain performance and anti-chemical corrosion performance. Compared with galvanized coating, KK1# composite coating improves anti-corrosion capacity remarkably. As for black oxide fasteners, the torsion has been reduced by 70% . It has anti-seizure and anti-deformation functions. The test findings of the anti-corrosion coating show that after 2 500 hours of salt spray resistance test, the component with KK1# composite coating has 33% of white rust area and less than 1 % of red rust area. The latter goes far beyond and thus desirably satisfies the requirement that red rust area should be less than 15% of the total.%为了实现海洋平台紧固件和标准件的长效防腐,解决恶劣环境带来的腐蚀问题,提出了KK1#复合涂层防腐工艺.该工艺采用“电镀锌+Xylan狮隆涂料”复合涂层,利用了Xylan 1424水性涂料的干膜自润滑性能和摩擦因数在0.05 ~0.10之间的特性,具有优越的防盐雾腐蚀性能,极强的抗酸雨性能以及防化学腐蚀性能.相比镀锌涂层,KK1#复合涂层能大幅提高防腐蚀能力,相对于发黑紧固件,减小扭矩高达70%,具有防咬死、防变形功能.防腐涂层测试结果表明,涂有KK1#复合涂层的构件耐盐雾试验2 500 h后,白锈面积33%,红锈面积小于1%,远超出红锈面积不大于15%的要求.

  11. Nano-engineering of superhydrophobic aluminum surfaces for anti-corrosion

    Science.gov (United States)

    Jeong, Chanyoung

    Metal corrosion is a serious problem, both economically and operationally, for engineering systems such as aircraft, automobiles, pipelines, and naval vessels. In such engineering systems, aluminum is one of the primary materials of construction due to its light weight compared to steel and good general corrosion resistance. However, because of aluminum's relatively lower resistance to corrosion in salt water environments, protective measures such as thick coatings, paints, or cathodic protection must be used for satisfactory service life. Unfortunately, such anti-corrosion methods can create other concerns, such as environmental contamination, protection durability, and negative impact on hydrodynamic efficiency. Recently, a novel approach to preventing metal corrosion has emerged, using superhydrophobic surfaces. Superhydrophobic surfaces create a composite interface to liquid by retaining air within the surface structures, thus minimizing the direct contact of the liquid environment to the metal surface. The result is a highly non-wetting and anti-adherent surface that can offer other benefits such as biofouling resistance and hydrodynamic low friction. Prior research with superhydrophobic surfaces for corrosion applications was based on irregular surface roughening and/or chemical coatings, which resulted in random surface features, mostly on the micrometer scale. Such microscale surface roughness with poor controllability of structural dimensions and shapes has been a critical limitation to deeper understanding of the anti-corrosive effectiveness and optimized application of this approach. The research reported here provides a novel approach to producing controlled superhydrophobic nanostructures on aluminum that allows a systematic investigation of the superhydrophobic surface parameters on the corrosion resistance and hence can provide a route to optimization of the surface. Electrochemical anodization is used to controllably modulate the oxide layer

  12. Estimating hull coating thickness distributions using the EM Algorithm

    OpenAIRE

    Corriere, Michael A.

    2000-01-01

    The underwater hull coating system on surface ships is comprised anti-corrosive (AC) and anti-fouling (AF) paint The AF layers are designed to wear away, continuously leaching cuprous oxide to inhibit marine growth. The thickness of the AF paint layers determines the expected service life of a coating system. Thus, it is important to assess the thickness of the AF layers to determine if the current hull coating system is sufficient. The Naval Ship Technical Manual (NSTM) provides specific gui...

  13. Selection of optimal conditions for anti-corrosive microbial biopolymer production by the Flavobacterium strain using response surface methodology (RSM

    Directory of Open Access Journals (Sweden)

    mojtaba khani

    2016-09-01

    Full Text Available Introduction: Various methods have been proposed to deal with corrosion. One of these methods is using of paints and coatings. In formulation of paints and coatings several anti-corrosion compounds are applied that slow down the corrosion process. In this respect, using microbial biopolymers can improve this problem in the industry with lower costs because of biopolymer production not required to factory and advanced industry. in this study, the effects of temperature, pH and agitation on the biopolymer production using response surface methodology (RSM were evaluated. Materials and methods: To produce biopolymer, the culture medium (300 ml were added in the 500 ml erlenmeyer flasks. Then, the bacterial preculture medium (6% V/V were inoculated in the flasks and incubated for 96hr in different conditions (agitation speed, tempreture and pH. Afterwards, the medium was centrifuged at 9000 rpm for 10 min and the supernatant was mixed with triple volume of chilled absolute ethanol and stored at 4°C for 24hr to precipitate. Results: Analysis of the results of design experiments indicate that the biopolymer production­ was strongly governed by the temperature, pH and agitation. The biopolymer production increased steadily up to pH 8 and decreased in the higher pH values. Also, for cell growth suitable temperature was 33°C and maximum concentration of the biopolymer production was agitation of 210 rpm. Finally, maximum concentration of the biopolymer production (14.3g/l was determined to be in pH of 8, temperature of 33°C and agitation of 210­rpm. Discussion and conclusion: Anti-corrosive biopolymer production by Flavobacterium sp. affected significantly by physical parameters. The results of the biopolymer production by investigating the conditions of temperature, pH and agitation after optimization, indicates the importance of this parameter for economic production of biopolymer.

  14. 油井杆、管、泵腐蚀原因分析与防腐措施综述%Analysis of Corrosion and Anticorrosion Measure of Rod, Pile and Pump in Oil Well

    Institute of Scientific and Technical Information of China (English)

    孙宾宾

    2015-01-01

    分析了采油井杆、管、泵腐蚀的原因,包括原电池型腐蚀、析氢型腐蚀、氧化型和二氧化碳型腐蚀、硫化裂纹型腐蚀、细菌型腐蚀等;综述了井下设备的防腐措施,包括注入缓蚀剂、涂镀层防腐、采用渗氮油管防腐、采用抗腐蚀管材、采用阴极保护等。采油井杆、管、泵腐蚀是一个多因素的问题,需要通过对腐蚀机理的深入研究,才能开发出防腐的更好方法。%The corrosion reasons of rod, pile and pump in oil well were analyzed, such as galvanic corrosion, hydrogen evolution corrosion, oxidized and carbon dioxide corrosion, crack sulfide corrosion, bacterial corrosion, and so on. The anti-corrosion measures of down-hole equipments were summarized, such as inhibitor injection, coating anti-corrosion, anti-corrosion using nitriding pipeline, anti-corrosion using resistant pipes, cathode protection, and so on. The corrosion of rod, pile and pump were multi-factorials problem, in order to develop a better way to anti-corrosive, the corrosion mechanism must be in-depth studied.

  15. Anticorrosive Design for Steel Structured Foundation for Offshore Wind Turbines%海上风机基础钢结构防腐蚀设计

    Institute of Scientific and Technical Information of China (English)

    乐治济; 林毅峰

    2013-01-01

    The paper summarizes the characteristics of corrosion of foundations for offshore wind turbines and the anticorro-sive measures in common use for offshore wind turbine foundations. The technology of anticorrosion coating in atmospheric zone where high weather sustainability is required and the technology of anticorrosion coating and wrapping in the splash and tidal zones where high corrosion resistance is required are analyzed and compared. It is then recommended that a corrosion protection design for an offshore wind turbine foundation should take into consideration the full life cycle of the foundation in its whole construction and operational duration,and relative design considerations are put forward for the reference for selec-tion of corrosion protection designs of offshore wind turbine fields.%总结了海上风机基础的腐蚀特点,以及适用于海上风机基础的常用防腐蚀方法。着重分析比较了耐候性要求高的大气区的涂层防腐技术、耐蚀性要求高的浪溅区、水位变动区的涂层防腐技术和包覆防腐技术。建议风机基础防腐蚀设计采用考虑整个建设和运行期的全寿命周期设计,并阐述了相关设计要点。可供海上风电场选择防腐蚀设计方案参考。

  16. Fabrication of FDTS-modified PDMS-ZnO nanocomposite hydrophobic coating with anti-fouling capability for corrosion protection of Q235 steel.

    Science.gov (United States)

    Arukalam, Innocent O; Oguzie, Emeka E; Li, Ying

    2016-12-15

    Perfluorodecyltrichlorosilane-based poly(dimethylsiloxane)-ZnO (FDTS-based PDMS-ZnO) nanocomposite coating with anti-corrosion and anti-fouling capabilities has been prepared using a one-step fabrication technique. XPS analysis and contact angle measurements showed the fluorine content to increase, while the hydrophobicity of the coatings decreased with addition of FDTS. XRD analysis revealed existence of ZnO nanoparticles of dimensions ranging from 11.45 to 93.01nm on the surface of coatings, with the mean particle size decreasing with FDTS addition, and was confirmed by SEM and TEM observations. Interestingly, the anti-corrosion performance and mechanical properties of the coatings increased remarkably on addition of FDTS. Indeed, the observed low adhesion strength, surface energies and the outstanding anti-corrosive properties imply that the obtained coating would be useful in anti-fouling applications.

  17. Estudio de las Propiedades Anticorrosivas del Benzoato de Hierro (III en Pinturas Base Solvente Study of Anticorrosive Properties of the Iron (III Benzoate in Solvent Based Paints

    Directory of Open Access Journals (Sweden)

    Guillermo Blustein

    2006-01-01

    Full Text Available La acción inhibidora del benzoato de hierro en electrodos de acero SAE 1010 en contacto con una suspensión acuosa fue estudiada mediante ensayos electroquímicos. Paralelamente, la eficiencia anticorrosiva de este producto incorporado a cubiertas orgánicas base solvente fue evaluada mediante ensayos de envejecimiento acelerado (cámara de niebla salina y de humedad. La evolución del comportamiento protector de la cubierta aplicada sobre paneles de acero pintados e inmersos en una solución 0.5M de NaClO4 fue periódicamente monitoreada por espectroscopía de impedancia electroquímica. Los resultados obtenidos indican que las pinturas formuladas con benzoato férrico presentan una capacidad anticorrosiva comparable a las formuladas con fosfato de cinc.This study investigated the inhibitory action of iron benzoate on SAE 1010 steel electrodes in aqueous suspensions using electrochemical assays. The anticorrosive efficiency of this product added to organic solvent-based coatings was also evaluated by means of accelerated weathering tests (salt spray cabinet and humidity chamber. The evolution of the protective behavior of the coating applied on steel panels and immersed in 0.5M NaClO4 solution was periodically checked by electrochemical impedance spectroscopy. The results obtained showed that paints formulated with ferric benzoate provide anticorrosive protection similar to those formulated with zinc phosphate.

  18. 埋地钢管外防腐系统腐蚀因素的检测评价与控制%Detection Assessment and Control of Corrosion Factors on External Anti-corrosion System of Buried Steel Pipelines

    Institute of Scientific and Technical Information of China (English)

    娄桂云

    2012-01-01

    Based on the external anti-corrosion detection of buried steel pipelines in North Shanghai Gas Business CO., Ltd, the artilce analyses the influences of the external anti-corrosion coating, the cathode protection effectiveness, the influences of the stray current, and puts forward the corrosion controlling method.%文章通过对上海燃气市北销售有限公司埋地钢管外防腐系统的检测,分析了外防腐层保护效果、阴极保护效果以及杂散电流对钢管腐蚀的影响,并提出了腐蚀控制措施。

  19. Effect of preparation method on the anti-corrosive properties of nanocrystalline Zn-CoO ceramic pigments

    Energy Technology Data Exchange (ETDEWEB)

    Rasouli, S. [Department of Nanotechnology, Institute for Color Science and Technology (ICST), 55 Vafamanesh Ave., HosseinAbad Square, Pasdaran St., 1668814811 Tehran (Iran, Islamic Republic of); Danaee, I. [Abadan Faculty of Petroleum, Petroleum University of Technology (PUT), Abadan (Iran, Islamic Republic of)

    2011-05-15

    Zn-CoO green ceramic pigments were synthesized by two different methods; high energy ball milling and solution combustion, with two different fuels; citric acid and glycine. Products were characterized by X-ray diffraction and scanning-transmission electron microscopy (TEM). The anti-corrosive properties of the obtained pigments were investigated by electrochemical impedance spectroscopy (EIS) techniques. Results have shown that either by solid state reaction or combustion by citric acid, a calcination step was needed to obtain the desired phase whereas by glycine fuel, pure ZnO phase was obtained directly. TEM showed particles with mean particle size of about 70, 150, and 180 nm for glycine, citric acid, and solid state reaction samples, respectively. The corrosion performance of the coating in 3% w/v NaCl solution was evaluated by EIS and polarization measurements. According to the measurements of EIS and electrochemical polarization, the coatings with glycine-based pigment showed the highest corrosion resistance among the prepared coatings. (Copyright copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  20. Corrosion Resistance of Zinc Coatings With Aluminium Additive

    Directory of Open Access Journals (Sweden)

    Votava Jiří

    2014-08-01

    Full Text Available This paper is focused on evaluation of anticorrosion protection of inorganic metal coatings such as hot-dipped zinc and zinc-galvanized coatings. The thickness and weight of coatings were tested. Further, the evaluation of ductile characteristics in compliance with the norm ČSN EN ISO 20482 was processed. Based on the scratch tests, there was evaluated undercorrosion in the area of artificially made cut. Corrosion resistance was evaluated in compliance with the norm ČSN EN ISO 9227 (salt-spray test. Based on the results of the anticorrosion test, there can be stated corrosion resistance of each individual protective coating. Tests were processed under laboratory conditions and may vary from tests processed under conditions of normal atmosphere.

  1. The effect of varying carboxylic-group content in reduced graphene oxides on the anticorrosive properties of PMMA/reduced graphene oxide composites

    Directory of Open Access Journals (Sweden)

    K. C. Chang

    2014-12-01

    Full Text Available We present comparative studies on the effect of varying the carboxylic-group content of thermally reduced graphene oxides (TRGs on the anticorrosive properties of as-prepared poly(methyl methacrylate (PMMA/TRG composite (PTC coatings. TRGs were formed from graphene oxide (GO by thermal exfoliation. The as-prepared TRGs were then characterized using Fourier transform infrared (FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS. Subsequently, the PTC materials were prepared via a UV-curing process and then characterized using FTIR spectroscopy and transmission electron microscopy (TEM. PTC coatings containing TRGs with a higher carboxylic-group content exhibited better corrosion protection of a cold-rolled steel electrode that those with a lower carboxylic-group content. This is because the well-dispersed TRG with a higher carboxylic-group content embedded in the PMMA matrix effectively enhances the oxygen barrier properties of the PTC. This conclusion was supported by gas permeability analysis.

  2. Preparation of Epoxy/Montmorillonite Nanocomposite Coating and Investigation on Heat Resistance and Anticorrosion Properties in Oil- Gas Environment with H2S/CO2%环氧/蒙脱土复合涂层的制备及在H2S/CO2环境中的耐热防腐性能研究

    Institute of Scientific and Technical Information of China (English)

    胡银春; 马丽琴; 董玉华; 王献昉; 周琼

    2011-01-01

    The title anti -corrosive and heat resistant coating, which coud be used in oil -gas environment with H2S/CO2, has been developed by optimizing the curing process, clay content and resin component to improve heat - resistance and corrosion resistance of epoxy coating. The heat - resistant and anti - corrosive properties of the coating in oil - gas environment with H2S/CO2 was investigated with autoclave test.The results showed that heat pre treatment could significantly increase the Tg of the binder, and epoxy resin could be intercalated into the organic montmorillonite layers with mechanical stirring at 80 ℃. OMMT could be well dispersed in the binder when its content was 3% (m/m), and the nanocomposite showed an intercalation/stripping hybrid characteristic, which could ensure both the thermo -mechanical and barrier properties. When the Tg of the varnish coating was 153.7 ℃, its anti - corrosive property was good in oil - gas environment with H2S/CO2 at 150. 0 ℃, which meant the Tg could be used as the upper marging temperature for anti -corrosive coating.%通过优化固化工艺、有机蒙脱土含量及树脂组分改善环氧涂层的耐热性,制备应用于高温H2S/CO2腐蚀环境中的环氧耐热防腐涂层,采用高温高压釜试验测试了涂层的耐热防腐效果.结果表明:适当的高温处理能显著提高基体树脂的玻璃化转变温度;环氧树脂在80℃机械搅拌条件下插入有机蒙脱土的层间,质量分数为3%的有机蒙脱土在基体中分散均一,为插层/剥离混合型复合结构,兼顾材料的热机械性能和阻隔性能;清漆涂层的玻璃化转变温度为153.7℃,其防腐涂层在150℃以下含H2S/CO2的油气环境中的防腐效果良好,说明玻璃化转变温度作为防腐涂层的使用上限温度是可行的.

  3. Effects of Nano Pigments on the Corrosion Resistance of Alkyd Coating

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Alkyd coatings embedded with nano-TiO2 and nano-ZnO pigments were prepared. The effects of nano pigments on anticorrosion performance of alkyd coatings were investigated using electrochemical impedance spectrum (EIS). For the sake of comparison, the corrosion protection of alkyd coatings with conventional TiO2 and ZnO was also studied. It was found that nano-TiO2 pigment improved the corrosion resistance as well as the hardness of alkyd coatings. The optimal amount of nano-TiO2 in a colored coating for corrosion resistance was 1%. The viscosities of alkyd coatings with nanometer TiO2 and ZnO and conventional TiO2 and ZnO pigments were measured and the relation between viscosity and anticorrosion performance was discussed.

  4. Protection against corrosion of magnesium alloys with both conversion layer and sol–gel coating

    OpenAIRE

    2013-01-01

    International audience; The anticorrosion performances of a system consisting of a phosphate based conversion layer and a hybrid sol–gel coating have been evaluated for the magnesium alloy Elektron21. The lone sol–gel coating affords a significant protection of the magnesium substrate. However, the presence of an intermediate conversion layer is presumed to improve the corrosion resistance of the system. The surface morphology of the protection coatings was characterized by optical microscopy...

  5. Multilayer ceramic coating for impeding corrosion of sintered NdFeB magnets

    Institute of Scientific and Technical Information of China (English)

    A.Ali; A.Ahmad; K.M.Deen

    2009-01-01

    Sintered NdFeB magnets have complex microstructure that makes them susceptible to corrosion in active environments.The current paper evaluated the anticorrosion characteristics of multilayer titanium nitride ceramic coating applied through cathodic arc physical vapour deposition(CAPVD) for protection of sintered NdFeB permanent magnets.The performance of ceramic coating was compared to the electrodeposited nickel coating having a copper interlayer.Electrochemical impedance spectroscopy(EIS) and cyclic polar...

  6. Present Status and Research Progress of Anti-corrosion Technology in Pipeline%管道内防腐技术现状与研究进展

    Institute of Scientific and Technical Information of China (English)

    赵帅; 兰伟

    2015-01-01

    介绍了石油管道内溶解氧、二氧化碳、硫化氢、以及二氧化碳和硫化氢协同腐蚀的机理. 综述了油气管道内防腐技术,现阶段主要的处理方式是选择耐蚀金属材料或非金属材料、添加缓蚀剂、涂层防腐和衬里防腐. 分析了各种内防腐技术的优缺点,认为管道内防腐在未来的发展方向是将基材选择、添加缓蚀剂、内涂镀层和内衬里技术进行综合,以减缓管道内的腐蚀. 低碳钢表面镀镍层自纳米合金化技术,即是集中内防腐技术的综合运用,得到了表面无缝冶金结合的高耐蚀性能管材,是未来发展趋势的代表.%The co-corrosion mechanism of oil and gases such as dissolved oxygen, carbon dioxide, hydrogen sulfide as well as carbon dioxide and hydrogen sulfide in the pipeline was described. The anti-corrosion technology of oil and gas in pipeline was re-viewed, including selection of corrosion resistant metallic materials or non-metallic materials, addition of corrosion inhibitor, coat-ing technology and lining technology. The paper analyzed advantages and disadvantages of various anti-corrosion technology and proposed that the future development trend of pipeline corrosion would be combination of substrate selection with addition of corro-sion inhibitors and internal lining technology for coating and lining to slow down the corrosion inside the pipe. Low carbon steel nickel-plated layer by nano alloying technology, which is the integrated utilization of concentrated anti-corrosion technology to ob-tain high metallurgical bonding surface seamless pipe with high corrosion resistance, is representative of future trends.

  7. Smart self-repairing protective coatings

    Directory of Open Access Journals (Sweden)

    Daria V. Andreeva

    2008-10-01

    Full Text Available Nanocontainers with a shell possessing controlled release properties can be used to fabricate a new family of active coatings that can respond quickly to changes in the coating environment or the coating's integrity. The release of corrosion inhibitors encapsulated within nanocontainers is triggered by the corrosion process, which prevents the spontaneous leakage of the corrosion inhibitor out of the coating. Moreover, if different types of nanocontainers loaded with the corresponding active agents are incorporated simultaneously into a coating matrix, the coating can act in several different ways (e.g. antibacterial, anticorrosion and antistatic. This review presents methods for the fabrication of such nanocontainers, how they can encapsulate active material, and their permeability properties.

  8. Influence of Simulated Outside-Reactor Irradiation on Anticorrosion Property of Austenitic Stainless Steel

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The influence of γ-ray irradiation on the properties of inside-reactor stainless steel structures was studied by simulating the working condition of pressurized water reactor (PWR) first circuit and the outside-reactor γ-ray irradiation. The result shows that the simulated outside-reactor irradiation (irradiation dose 4.4 × 104 Gy) has no influence on anticorrosion properties of solutionized SUS304 austenitic stainless steel, including intergranular corrosion (IC) and stress corrosion cracking (SCC). Anticorrosion properties (IC, SCC) of sensitized SUS304 austenitic stainless steel are reduced by simulated outside-reactor irradiation. The longer the sensitizedtime is, the more obvious the influence is.

  9. Corrosion Inhibition on SAE 1010 Steel by Nanoscale Exopolysaccharides Coatings Determined by Electrochemical and Surface Characterization

    Science.gov (United States)

    Plating, painting and the application of enamel are the most common anti-corrosion treatments. They are effective by providing a barrier of corrosion resistant material between the damaging environment and the structural material. Coatings start failing rapidly if scratched or damaged because a co...

  10. 湿法脱硫系统混凝土烟道内防腐蚀方案%Anticorrosion Scheme for Concrete Chimney in Flue Gas Desulphurization System

    Institute of Scientific and Technical Information of China (English)

    何思立; 李建三; 龙乃健; 曾松峰

    2014-01-01

    The corrosion behavior of bare common concrete,bare ceramsite concrete and test blocks with modified epoxy liner anticorrosion coating was studied in concrete chimney of flue gas desulphurization systems.Blister of the coating and other obvious changes did not appear on the epoxy liners after 6 months test.No any corrosion indication happened to the rebar in concrete block with epoxy liner anticorrosion coating,indicating a good protection to the rebar in concrete block.After 6 months test,the chlorine element in concrete block with epoxy liners was not found by the analysis result of energy dispersive spectrometer,and the content of sulfur did not increase compared with the untested concrete block.The results showed that the epoxy liner anticorrosion coating could prevent the permeation of harmful corrosives and provide the concrete block with very good protection.The results of engineering application experiment also proved the very good protection of epoxy liner anticorrosion scheme for concrete chimney in flue gas desulphurization systems.%采用改性环氧配套衬里的方案制备防腐蚀层。对普通混凝土试样与陶粒砼试样及防腐蚀层在脱硫系统烟道内的现场腐蚀行为进行试验研究。试验6个月后环氧配套衬里层没有鼓泡烧蚀,未观察到明显的变化。采用环氧配套衬里防腐蚀层的混凝土试块,在试验6个月后其内部的钢筋未发现腐蚀现象,表明环氧配套衬里对混凝土中的钢筋起到了较好的保护作用。试验6个月后环氧配套衬里混凝土样的能谱结果均未检测到氯元素,硫元素的含量同未试验的对比测试样相比也未增加,表明环氧配套衬里对混凝土起到了很好的保护作用。工程应用结果表明,改性环氧配套衬里的防腐蚀方案能够对湿法脱硫系统的混凝土烟道起到很好的防腐蚀保护作用。

  11. Anticorrosion property of polyaniline doped twice with functional acid%功能酸二次掺杂聚苯胺的防腐蚀性能

    Institute of Scientific and Technical Information of China (English)

    杨显; 杨小刚; 马新起

    2014-01-01

    As polyaniline (PANI) has unique doping and dedoping characteristics, good morphology nanofibers can be synthesized under specific reaction conditions and new nanomaterials with special anticorrosion functional groups can be prepared via the dedoping and twice doping process. PANI nanofibers doped with sulfuric acid were dedoped by ammonia solution, and based on this dedoped PANI, twice doped PANI were prepared in phosphoric acid, p-toluene sulfonic acid and tartaric acid system respectively. The structure of doped and twice doped PANI was characterized by FT-IR spectrometer and UV-Vis absorption spectrometer. An electrochemical workstation was used to record the open circuit potential (OCP) and the electrochemical impedance spectroscopy (EIS) of polyaniline/epoxy composite coatings, and their anticorrosion mechanism were investigated theoretically. FT-IR spectra and UV-Vis spectra indicated that the state of PANI was doped PANI in its emeraldine salt form. The electrochemical testing results showed that every coating had certain anticorrosion performance and the impedance value suffered a significant decrease at the beginning of immersion because the coating was permeated by the corrosive medium. The impedance value of twice doped PANI and doped PANI tended to stabilize after immersion for 22 d and 60 d respectively, the protection effect could be explained by the assumption that metallic cations formed a passivating complex with the dopant anion released from PANI, which improved the barrier property of PANI coating and slowed down the further corrosion of the metal. PANI doped twice with functional acid had better anticorrosion performance than doped state and twice doped PANI had higher impedance. PANI doped twice with tartaric acid had the highest impedance, the impedance value was 3.48×107Ω·cm2 after immersion for 120 d, an order of magnitude higher than its doped state.%聚苯胺具有独特的掺杂脱掺杂特性,能在特定的反应条件下合

  12. GO@CuSilicate nano-needle arrays hierarchical structure: a new route to prepare high optical transparent, excellent self-cleaning and anticorrosion superhydrophobic surface

    Science.gov (United States)

    Fan, Ping; Chen, Jingyi; Yang, Jintao; Chen, Feng; Zhong, Mingqiang

    2017-02-01

    Transparent superhydrophobic coatings, which are highly desired for the protection of material surfaces, have been limited to particular kinds of materials, e.g. silicon dioxide. In this work, a hybrid compound of graphene oxide and copper silicate with hierarchical structure was developed and was used to fabricate coatings. Due to the high transparency of graphene oxide and the nanoscopic roughness created by nanoneedles of CuSilicate, with very low compound loading (0.052 mg/cm2), the as-prepared coating was found not only showing superhydrophobic properties with a water contact angle (CA) of ˜152° and a near zero sliding angle (SA) of 0.5 but also showing high optical transparent (light transmittance is as high as 94.5 % at 500 nm). Furthermore, this surface also showed efficient anticorrosion properties and excellent self-cleaning ability. This study not only fabricated a new surface with transparency and surperhydrophobicity based on graphene materials, but also hopefully offers a method for the fabrication of multifunctional coatings.

  13. Unique characteristics of Pb in soil contaminated by red lead anti-corrosion paint

    NARCIS (Netherlands)

    Brokbartold, M.; Temminghoff, E.J.M.; Weng, L.; Marschner, B.

    2013-01-01

    Red lead (Pb3O4) has been extensively used in the past in anti-corrosion paints for the protection of steel constructions such as electricity pylons or bridges. Until recently, little has been known about the behavior of these Pb compounds in soils. Therefore, three pylon soils and six red lead anti

  14. A new smart additive of reinforced concrete based on modified hydrotalcites: Preparation, characterization and anticorrosion applications

    NARCIS (Netherlands)

    Yang, Z.; Fischer, H.; Polder, R.

    2012-01-01

    A carbonate form of Mg-Al-hydrotalcite and its p-aminobenzoate (pAB) modified derivative (i.e.,Mg(2)Al-pAB) were synthesized and characterized by means of XRD and FT-IR. The anticorrosion behavior was evaluated based on open circuit potential (OCP) of carbon steel in simulated concrete pore solution

  15. ANTI-CORROSION PROPERTIES OF CARBOXYLIC ACID IN WATER-GLYCOL SOLUTIONS

    Directory of Open Access Journals (Sweden)

    BASHKIRCEVA N.Y.

    2012-01-01

    Full Text Available Sodium salts of carboxylic acids were investigated to evaluate the corrosion properties of the water-glycol solutions. Corrosion tests were performed by methods of gravimetry and galvanostatic dissolution with metals used in cooling systems. The compositions of anticorrosion systems and their concentration that provide the most effective inhibition of metals were determined.

  16. Research Adhesion and Physico-Mechanical Properties and Development of Anticorrosive Composite Polymeric Coverings

    Science.gov (United States)

    Negamatov, S. S.; Mamadalimov, R. M.; Latipov, I. X.; Babxanova, M. G.; Negmatova, K. S.; Salimsakov, Y. A.

    2008-08-01

    In work is shown, that introduction loading on the basis of industrial screenings such as phosphoslag, phosphogypsum and withdrawal Mardjanbulak gold-mining of factory the incorporating sets oxides of metals positively influence on anticorrosive, physical and strength of property of the investigated composite materials on basis epoxy of pitch [1-4].

  17. Oleic acid-grafted chitosan/graphene oxide composite coating for corrosion protection of carbon steel.

    Science.gov (United States)

    Fayyad, Eman M; Sadasivuni, Kishor Kumar; Ponnamma, Deepalekshmi; Al-Maadeed, Mariam Al Ali

    2016-10-20

    An anticorrosion coating film based on the formation of nanocomposite coating is reported in this study. The composite consisted of chitosan (green matrix), oleic acid, and graphene oxide (nano filler). The nanocomposite coating was arranged on the surface of carbon steel, and the corrosion resistance was monitored using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP). Compared to the pure chitosan (CS) coating, the corrosion resistance of oleic acid-modified chitosan/graphene oxide film (CS/GO-OA) is increased by 100 folds. Since the well-dispersed smart grafted nanolayers delayed the penetration rate of corrosive species and thus maintained long term anticorrosive stability which is correlated with hydrophobicity and permeability.

  18. Effect of current density on the structure, composition and corrosion resistance of plasma electrolytic oxidation coatings on Mg-Li alloy

    Energy Technology Data Exchange (ETDEWEB)

    Li, Zhijun [Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 (China); Yuan, Yi, E-mail: yi.yuan@hrbeu.edu.cn [Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 (China); Jing, Xiaoyan [Key Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 (China)

    2012-11-15

    Highlights: Black-Right-Pointing-Pointer The PEO coatings exhibit tunable characteristics by controlling the current density. Black-Right-Pointing-Pointer The coating formed at 5 A/dm{sup 2} exhibits the highest corrosion resistance. Black-Right-Pointing-Pointer Anti-corrosion properties of PEO coatings are related to coating surface composition. - Abstract: The effect of current density on the oxidation process, morphology, composition and anti-corrosion properties of coatings are elucidated. X-ray photoelectron spectroscopy and X-ray diffraction analysis of coatings show that coatings prepared at different current densities are composed of MgO and {gamma}-Mg{sub 2}SiO{sub 4} and {alpha}-Mg{sub 2}SiO{sub 4} phase. The chemical composition of PEO coatings varies from surface to the interior of the oxide coating. The PEO coatings exhibit tunable thickness, composition ratio, and porosity by controlling the current density, which ultimately affects film morphology and anti-corrosion properties. The superior corrosion resistance of coating obtained at 5 A/dm{sup 2} is attributed to the compactness of the barrier layer and the highest MgO/Mg{sub 2}SiO{sub 4} ratio.

  19. Investigation of the bio-resistance of insulating protective coatings modified by polymeric petroleum resins

    OpenAIRE

    Nykulyshyn, Irena; Pikh, Zorian; Gnatush, Svitlana; Gnativ, Zoriana; Chajkivska, Ruslana

    2016-01-01

    Basic patterns of modification of bitumen composites by polymeric petroleum resins (PPR) are processed. Creation of new highly effective metal protecting compositions and study of their action patterns is an important scientific problem. It is found that introduction of PPR to the insulating petroleum bitumen improves the anticorrosive properties of protective coatings for underground pipelines. The adhesive strength of petroleum bitumen coatings is investigated. The mechanism of influence of...

  20. A Study on Corrosion Resistance of Coating System on Steel

    Energy Technology Data Exchange (ETDEWEB)

    Nah, Hwan Seon; Lee, Hyeon Ju; Kim, Kang Seok [Korea Electricity Power Research Institute, Daejeon (Korea, Republic of); Lee, Chul Woo [KEPCO E and Co., Yongin (Korea, Republic of)

    2007-04-15

    The design purpose of architectural finish on steel structures is to prevent corrosion in the respect of structural durability, function, beauty and economy. In particular, as structures located on shores is easily degraded due to damage from salt, it is necessary to evaluate the applied coating systems on steel structures. This study is focused on anti-corrosive tests of both steel surfaces and high strength bolts. Two kinds of tests were conducted on each specimen under the condition of outdoor exposure and salt spray comparatively during 760 hours. In case of coating systems on steel surfaces, three layered coating system showed the best function among the various coating systems. Regarding the coating systems on high strength bolts, the coating system composed of zinc dust on hot dip galvanized coating was found to be the best against corrosion.

  1. 沿海地区输电铁塔防腐蚀方法对比分析%Comparison and Analysis on Anticorrosion Methods of Transmission Tower in Coastal Area

    Institute of Scientific and Technical Information of China (English)

    马承志; 杨宏仓; 余启育; 梁位正; 林岳凌

    2014-01-01

    提出了四个输电铁塔防腐蚀方案,考虑沿海地区的环境特征分别对其进行了盐雾加速试验。实验结果表明,带锈涂料防腐方法和金属涂层+有机封闭涂层防腐方法相对于常规的热镀锌方法均能有效缓解输电铁塔用钢铁材料在盐雾加速实验中的腐蚀作用。同时实验结果也表明,带锈涂料防腐方法的防腐蚀效果略优于金属涂层+有机封闭涂层防腐方法。%With considering environmental characteristics of coastal areas, four anticorrosion schemes were proposed for transmission tower in this paper. These schemes were tested by using salt spray corrosion chamber respectively. Experimental results showed that both of on rust paint scheme and metal + organic coating scheme can reduce the corrosion of steel material more effectively than that of the conventional scheme of hot galvanized. Also,the experimental results showed that on rust paint scheme has better anticorrosion effect than that of metal+organic coating scheme.

  2. Spin-Coated Polyelectrolyte Coacervate Films.

    Science.gov (United States)

    Kelly, Kristopher D; Schlenoff, Joseph B

    2015-07-01

    Thin films of complexes made from oppositely charged polyelectrolytes have applications as supported membranes for separations, cell growth substrates, anticorrosion coatings, biocompatible coatings, and drug release media, among others. The relatively recent technique of layer-by-layer assembly reliably yields conformal coatings on substrates but is impractically slow for films with thickness greater than about 1 μm, even when accelerated many fold by spraying and/or spin assembly. In the present work, thin, uniform, smooth films of a polyelectrolyte complex (PEC) are rapidly made by spin-coating a polyelectrolyte coacervate, a strongly hydrated viscoelastic liquidlike form of PEC, on a substrate. While the apparatus used to deposit the PEC film is conventional, the behavior of the coacervate, especially the response to salt concentration, is highly nontraditional. After glassification by immersion in water, spun-on films may be released from their substrates to yield free-standing membranes of thickness in the micrometer range.

  3. Anti-corrosive Conversion Coating on Aluminium Alloys Using High Temperature Steam

    DEFF Research Database (Denmark)

    Din, Rameez Ud; Jellesen, Morten Stendahl; Ambat, Rajan

    chemistries based on pH and oxidizing capabilities. Treatment is carried out in an autoclave at a temperature of 110 – 112 °C and pressure of 5 Psi for varying times. The growth and composition of the oxide layer was investigated in detail as a function of microstructure using GD-OES, FEG-SEM, EDX, FIB...

  4. Anti-corrosion paint and varnish coatings employing wastes from coke and coal chemicals production

    Energy Technology Data Exchange (ETDEWEB)

    L.B. Pavlovich; N.M. Alekseeva; V.P. Dolgopolov; A.A. Popov [West Siberian Metallurgical Combine, Siberia (Russian Federation)

    2004-06-01

    The various shops of the West Siberian Metallurgical Combine operate 392 gas-cleaning units, and the combine annually spends 1.5 million rubles a year on major repairs to this equipment. The need to increase the service life of the air ducts is obvious. At the same time, the production of phthalic anhydride (PA) from commercial grades of naphthalene made at coke and coal chemicals plants also yields large quantities of waste products formed in oxidation reactions - still residues from the distillation of PA. These residues are currently used in coking charges. It is important that a way be found to recycle wastes from the production of phthalic anhydride, which is the main raw material used to make corrosion-resistant paints and lacquers. The goal of the research was to use PA production wastes to help develop promising new environmentally clean materials to protect metal from corrosion. The Combine has developed and mastered the production of two types of powdered polymer-based paint: quick-drying epoxide paint PEFAN-501; decorative epoxide-polyester paint NOVOLAN-1605. A section to make these paints has been set up and equipped with three units that apply the paints in an electrostatic field. The Combine has also developed a technology for using PA still residues to obtain an alkyl-epoxide primer for protecting gas pipes from corrosion. Experimental batches of the primer have been successfully tested on a section of gas pipe connected to the car dumper in the crushing-sorting plant operated by the sinter-lime department.

  5. Hybrid organic-inorganic coatings including nanocontainers for corrosion protection of magnesium alloy ZK30

    Energy Technology Data Exchange (ETDEWEB)

    Kartsonakis, I. A., E-mail: ikartsonakis@ims.demokritos.gr [IAMPPNM, NCSR ' DEMOKRITOS' , Sol-Gel Laboratory (Greece); Koumoulos, E. P.; Charitidis, C. A., E-mail: charitidis@chemeng.ntua.gr [School of Chemical Engineering NTUA (Greece); Kordas, G. [IAMPPNM, NCSR ' DEMOKRITOS' , Sol-Gel Laboratory (Greece)

    2013-08-15

    This study is focused on the fabrication, characterization, and application of corrosion protective coatings to magnesium alloy ZK30. Hybrid organic-inorganic coatings were synthesized using organic-modified silicates together with resins based on bisphenol A diglycidyl ether. Cerium molybdate nanocontainers (ncs) with diameter 100 {+-} 20 nm were loaded with corrosion inhibitor 2-mercaptobenzothiazole and incorporated into the coatings in order to improve their anticorrosion properties. The coatings were investigated for their anticorrosion and nanomechanical properties. The morphology of the coatings was examined by scanning electron microscopy. The composition was estimated by energy-dispersive X-ray analysis. The mechanical integrity of the coatings was studied through nanoindentation and nanoscratch techniques. Scanning probe microscope imaging of the coatings revealed that the addition of ncs creates surface incongruity; however, the hardness to modulus ratio revealed significant strengthening of the coating with increase of ncs. Studies on their corrosion behavior in 0.5 M sodium chloride solutions at room temperature were made using electrochemical impedance spectroscopy. Artificial defects were formatted on the surface of the films in order for possible self-healing effects to be evaluated. The results showed that the coated magnesium alloys exhibited only capacitive response after exposure to corrosive environment for 16 months. This behavior denotes that the coatings have enhanced barrier properties and act as an insulator. Finally, the scratched coatings revealed a partial recovery due to the increase of charge-transfer resistance as the immersion time elapsed.

  6. Hybrid organic-inorganic coatings including nanocontainers for corrosion protection of magnesium alloy ZK30

    Science.gov (United States)

    Kartsonakis, I. A.; Koumoulos, E. P.; Charitidis, C. A.; Kordas, G.

    2013-08-01

    This study is focused on the fabrication, characterization, and application of corrosion protective coatings to magnesium alloy ZK30. Hybrid organic-inorganic coatings were synthesized using organic-modified silicates together with resins based on bisphenol A diglycidyl ether. Cerium molybdate nanocontainers (ncs) with diameter 100 ± 20 nm were loaded with corrosion inhibitor 2-mercaptobenzothiazole and incorporated into the coatings in order to improve their anticorrosion properties. The coatings were investigated for their anticorrosion and nanomechanical properties. The morphology of the coatings was examined by scanning electron microscopy. The composition was estimated by energy-dispersive X-ray analysis. The mechanical integrity of the coatings was studied through nanoindentation and nanoscratch techniques. Scanning probe microscope imaging of the coatings revealed that the addition of ncs creates surface incongruity; however, the hardness to modulus ratio revealed significant strengthening of the coating with increase of ncs. Studies on their corrosion behavior in 0.5 M sodium chloride solutions at room temperature were made using electrochemical impedance spectroscopy. Artificial defects were formatted on the surface of the films in order for possible self-healing effects to be evaluated. The results showed that the coated magnesium alloys exhibited only capacitive response after exposure to corrosive environment for 16 months. This behavior denotes that the coatings have enhanced barrier properties and act as an insulator. Finally, the scratched coatings revealed a partial recovery due to the increase of charge-transfer resistance as the immersion time elapsed.

  7. Analysis and Study on the Heavy-duty Anticorrosion of Crude Oil Tanks%原油储罐高防腐体系的分析及研究

    Institute of Scientific and Technical Information of China (English)

    潘奇; 程丽华; 赵德智; 施雯

    2012-01-01

    根据对本地区原油储罐腐蚀性环境的研究,归纳出储罐内部和外部腐蚀因素。介绍了储罐防腐蚀设计中涂层保护和阴极保护并用所存在的问题,提出利用长链多能团硅烷偶联剂表面处理技术结合重防腐涂料(无溶剂纳米环氧树脂涂料、负离子吸收型导电涂料等)的解决方案。拟定建立原油储罐全面防腐蚀体系,为沿海储罐防腐蚀工作提供可括性依据和理论参考。%On the basis of the research on the corrosion environment of crude oil tanks in the area, the corrosion factors of the interior and exterior of the tankswere summarized, and the questions about the interaction of coating protection and cathodic protection in the anticorrosion design for crude oil tanks were introduced in the paper. It proposed a new solution which combined surface treatment technology, which used long-chain and multifunctional silane coupling agent, with heavy corrosion protection coatings such as solvent-free nano-modified epoxy resin coating, anion absorbed conductive coating and so on. This corrosion protection system of crude oil tanks provided feasibility foundation and theory reference for the anticorrosion of crude oil tanks in coastal areas.

  8. Lifetime prediction and failure analysis of organic coatings by EIS

    Institute of Scientific and Technical Information of China (English)

    YAN Rui; WU Hang; MA Shi-ning; XU Bin-shi

    2004-01-01

    Organic coatings are widely used to control the corrosion of steel structure. The anticorrosive property of these coatings depends on their barrier properties, making a separation between the corrosive medium and the substrate. But unavoidable completely small pores, cracks and other defects in organic coatings may cause ions, water, gases, and other corrosive species penetrate and distribute in the coatings, causing accumulation and swelling of coatings, so leading to the degradation of coatings. In addition, water affects the permeation of oxygen and other corrosive medium, consequently the presence of such substances at coating-metal interface promotes corrosion of metal substrate. So the absorbability of the coatings to water may be one of the most important factors in undercoating corrosion. In recent years, electrochemical impedance spectroscopy (EIS) has been established and frequently used as a non-destructive testing method for assessing the performance of organic coatings, especially for the determination of the water content in organic coatings, since the capacitance of the coatings is sensitive to the penetration of water. So from EIS it can extract a wealth of information on the electrochemical corrosion of coated steels, especially, it can be utilized to assess organic coatings used under particular surroundings. The principle, methods and application of EIS on evaluating life-span and analyzing failure mechanism of organic coatings are also introduced briefly. Combining other analysis techniques such as XRD, SEM and FTIR with electrochemical technique, it will blaze a way in studying degradation mechanism of organic coatings and estimating their lifetime.

  9. Coatings against corrosion and microbial adhesion

    Energy Technology Data Exchange (ETDEWEB)

    Telegdi, J.; Szabo, T.; Al-Taher, F.; Pfeifer, E.; Kuzmann, E.; Vertes, A. [Chemical Research Center, Hungarian Academy of Sciences, 1025 Budapest, Pusztaszeri ut 59/67 (Hungary)

    2010-12-15

    A systematic study on anti-corrosion and anti-fouling effect of hydrophobic Langmuir-Blodgett and self-assembled molecular layers deposited on metal surfaces, as well as anti-microbial adhesion properties of coatings with biocide is presented. Both types of efficiencies produced by LB films are enhanced by Fe{sup 3+} ions built in the molecular film. The quaternary ammonium type biocide embedded into the cross-linked gelatin decreased significantly the microbial adhesion, the biofilm formation. (Copyright copyright 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  10. POLYETHERSULFONE COATING FOR MITIGATING CORROSION OF STEEL IN GEOTHERMAL ENVIRONMENT.

    Energy Technology Data Exchange (ETDEWEB)

    SUGAMA, T.

    2005-06-01

    Emphasis was directed toward evaluating the usefulness of a polyethersulfone (PES)-dissolved N-methyl pyrrolidone (NMP) solvent precursor as a low-temperature film-forming anti-corrosion coating for carbon steel in simulated geothermal environments at brine temperatures up to 300 C. A {approx} 75 {micro}m thick PES coating performed well in protecting the steel against corrosion in brine at 200 C. However, at {>=} 250 C, the PES underwent severe hydrothermal oxidation that caused the cleavage of sulfone- and ether-linkages, and the opening of phenyl rings. These, in turn, led to sulfone {yields} benzosulfonic acid and ether {yields} benzophenol-type oxidation derivative transformations, and the formation of carbonyl-attached open rings, thereby resulting in the incorporation of the functional groups, hydroxyl and carbonyl, into the coating. The presence of these functional groups raised concerns about the diminutions in water-shedding and water-repellent properties that are important properties of the anti-corrosion coatings; such changes were reflected in an enhancement of the magnitude of susceptibility of the coatings surfaces to moisture. Consequently, the disintegration of the PES structure by hydrothermal oxidation was detrimental to the maximum efficacy of the coating in protecting the steel against corrosion, allowing the corrosive electrolytes to infiltrate easily through it.

  11. Ultrasound assisted synthesis of PANI/ZnMoO4 nanocomposite for simultaneous improvement in anticorrosion, physico-chemical properties and its application in gas sensing.

    Science.gov (United States)

    Bhanvase, B A; Darda, N S; Veerkar, N C; Shende, A S; Satpute, S R; Sonawane, S H

    2015-05-01

    Ultrasound assisted in-situ semi-batch emulsion polymerization has been used for the preparation of polyaniline (PANI) and PANI/ZnMoO4 nanocomposite with different loading of ZnMoO4 (ZM) nanoparticles. ZM nanoparticles were functionalized using Myristic acid (MA) for better compatibility with PANI. The cavitational effects induced due to ultrasonic irradiations have been shown significant enhancement in the dispersion of functionalized ZM nanoparticles into the PANI during ultrasound assisted in-situ emulsion polymerization process. TEM images of PANI/ZM nanocomposite particles give the direct evidence of fine dispersion and encapsulation of MA treated ZM nanoparticles in PANI matrix. The presence of ZM nanoparticles in PANI/ZM nanocomposite shows significant improvement in the mechanical (cross-cut adhesion), thermal, anticorrosion and sensing properties of PANI/ZM nanocomposite/alkyd coatings over PANI/alkyd and neat alkyd resin coating. Fine and uniform dispersion of ZM nanoparticles in PANI matrix using this novel synthesis method (PANI (p-type)/ZM (n-type) hetero-junction) improves LPG sensing ability and minimizes response time to sense LPG significantly compared with neat PANI.

  12. Boronized steels with corundum-baddeleyite coatings

    Directory of Open Access Journals (Sweden)

    P. Pokorny

    2016-07-01

    Full Text Available The paper describes preparation and properties of anti-corrosion and anti-abrasive coatings from corundum-baddeleyite ceramics deposited on surface of low-carbon boronized steel S235JRH-1.0038 (EN 10025-1 by plasma spraying method. Adhesive interlayers Fe2B reaches bond strength of up to 20 MPa in the pull-off tests, the ZrO2 - Al2O3 - SiO2 coatings have a value of fracture adhesion of 4 - 6 MPa. Hardness of these ceramic coatings on steel is as high as 1 800 HV100 and its polarization resistance is 1 600 Ω/cm2 to 4 000 Ω/cm2.

  13. Study of a new possibility to predict the behavior of high - performance anticorrosive protections applied on steel after their exposure in natural aggressive environments, respectively in laboratory accelerated conditions

    Directory of Open Access Journals (Sweden)

    Irina POPA

    2014-12-01

    Full Text Available As a result of the global warming, notable changes in the climatic regime of Romania were observed in the last 40-50 years by increasing of the maximum temperatures and decreasing of the minimum temperatures characteristic for each season. This paper makes reference to an experimental research regarding the actual severity of the Romanian climate and its effects toward some performant anticorrosive coatings applied on steel. Such performant anticorrosive protection systems were exposed in situ – marine and alpine environment - and in parallel, aiming to simulate the severe climatic actions through laboratory accelerated environments - neutral salt fog, condensation and temperature variations. The graphical representation and the interpretation of the adhesion to the steel surface by means of the variation of the class into which the paint was framed after performing the cross-cut test during the exposure provided information concerning a new possibility to predict the evolution of the degradation of the paint, by means of this characteristic experimentally determined.

  14. Synthesis and anticorrosive properties of waterborne isocyanate functionalized graphene/polyurethane nanocomposite emulsion%水性异氰酸酯改性石墨烯/聚氨酯复合乳液防腐性能研究∗

    Institute of Scientific and Technical Information of China (English)

    朱科; 李小瑞; 李菁熠; 费贵强; 王佼

    2016-01-01

    通过逐步聚合反应将异氰酸酯功能化石墨烯(IGN)接枝到水性聚氨酯(WPU)链段中,制备得到水性异氰酸酯改性石墨烯/聚氨酯纳米复合乳液(IGN/WPU).通过傅里叶变换红外的光谱(红外光谱)、原子力显微镜(AFM)、扫描电镜(SEM)对氧化石墨烯(GO)、IGN、WPU 及 IGN/WPU 复合材料的结构进行表征,并研究了IGN含量对复合乳液作为金属防腐涂层性能的影响.结果表明,随IGN含量增加,涂层硬度提高,水蒸气透过率下降,防腐效率增大.当m(IGN)=1%(质量分数)时,涂层硬度达到了2H,水蒸气透过率降低到51.98 g/m2. h,与空白样相比防腐效率提高了94.70%.%Waterborne isocyanate functionalized graphene/polyurethane nanocomposite emulsion has been pre-pared through step by step polymerization reaction,which isocyanate functionalization of graphene is grafted to the water-borne polyurethane chain section.Fourier transform infared spectrometer (FT-IR),atomic force mi-croscope (AFM)and scanning electron microscope (SEM)were used to characterize the structures of GO,IGN, WPU and IGN/WPU;the effect of IGN content on the properties of composite emulsion as metal anti-corrosion coating was systematically studied.The results show that hardness,barrier property to vapor and anticorrosive efficiency of the composite coating increases as IGN content is increasing.When m(IGN)=1wt%,the coating hardness up to 2 h,water vapor transmittance decreased to 51.98 g/(m2 .h),anticorrosive efficiency increased by 94.70% compared with blank sample.

  15. Investigation of an Intumescent Coating System in Pilot and Laboratory-scale Furnaces

    DEFF Research Database (Denmark)

    Nørgaard, Kristian Petersen

    (450 - 600 °C), at which the collapse may occur, is the use of a fire protective intumescent coating, which swells when exposed to temperatures above about 200 °C. The swelling of the intumescent coating happens according to a complex sequence of chemical reactions, whereby the coating forms a porous...... char, which thermally insulates the substrate. In addition to the coating itself, several process parameters influence the performance of the intumescent coating. Such parameters may for instance be the interaction with an underlying anticorrosive primer, the heating rate employed, or the oxygen...... content in the fire. In this work, focus has been on process parameters for an intumescent coating for so-called cellulosic fires. The thesis contains five chapters, where Chapter 1 is a literature survey providing background knowledge on coatings, intumescent coatings in particular, and fire scenarios...

  16. Improvement in corrosion resistance of magnesium coating with cerium treatment

    Institute of Scientific and Technical Information of China (English)

    Samia Ben Hassen; Latifa Bousselmi; Patricc Bercot; El Mustafa Rezrazi; Ezzeddine Triki

    2009-01-01

    Corrosion protection afforded by a magnesium coating treated in cerium salt solution on steel substrate was investigated using open circuit potential, polarization curves, and electrochemical impedance spectroscopy (EIS) in 0.005 M sodium chloride solution (NaCl). The morphology of the surface was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The cerium treated coating was obtained by immersion in CeCl3 solution. The results showed that the corrosion resistance of the treated magnesium coating was improved. The corrosion potential of the treated coating was found to be nobler than that of the untreated magnesium coating and the corrosion current decreased significantly. Impedance results showed that the cerium treatment increased corrosion protection. The improvement of anti-corrosion properties was ataibuted to the formation of cerium oxides and hydroxides that gave to a physical barrier effect.

  17. The Application of Antifouling Coatings Used on Urban Concrete Bridge%抗污涂料在城市混凝土桥梁上的应用

    Institute of Scientific and Technical Information of China (English)

    晏立宇; 王宁

    2012-01-01

    介绍了西安城市混凝土立交桥涂装配套设计方案,对提高混凝土防腐涂层抗污性的措施和防腐抗污涂层的技术要求进行了论述,并对混凝土桥梁涂装的施工工艺进行了介绍。%The coating design scheme of concrete overpass in Xian city were introduced, measurements for improve the concrete anti-corrosion coating anti-fouling properties and the technical requirements of anti-corrosive anti-fouling coating were discussed, and the construction technology of the concrete bridge coating were introduced.

  18. Substantial enhancement in the anticorrosivity of AA6061 by Doxycycline hydrochloride drug

    Directory of Open Access Journals (Sweden)

    Mudigere Krishnegowda Pavithra

    2015-08-01

    Full Text Available The significant anticorrosive property of the antibiotic drug doxycycline hydrochloride (DCH was investigated by electrochemical techniques such as potentiodynamic polarization, electrochemical impedance and chronoamperometric techniques. DCH inhibited the pitting corrosion of aluminium alloy 6061 (AA6061 in 3.5% NaCl media with 90% efficiency. The adsorption of DCH on AA6061 conform Langmuir isotherm by means of physisorption.  Quantum chemical calculations were evaluated to ascertain the active sites of DCH molecule responsible for adsorption and to support the experimental findings.

  19. The correlation between materials, processes and final properties in the pipeline coating system with polyethylene in triple layer; A correlacao entre materiais, processos e propriedades finais no sistema de revestimento de tubos com polietileno em tripla camada

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Luiz C.; Campos, Paulo H. [Confab Industrial S.A., Pindamonhangaba, SP (Brazil); Silva, Christian E.; Santos, Paulo T. [Soco-Ril do Brasil S.A., Pindamonhangaba, SP (Brazil)

    2003-07-01

    The use of anticorrosion coating is a common practice in industrial pipeline applications. Among the several coatings types to buried and submerged pipelines, over all, the Fusion Bonded Epoxy and Three Layer Polyethylene coating systems have been large employed. They have showed an excellent performance protecting the pipe metal from external corrosive environment, considerably decreasing the designed cathodic protection requirements, basically in the first years of pipeline operation. Coating system success depends on not only of a suitable design or of the materials technology, but also depends on the process parameters and the raw material characteristics exhibited during the application. In this paper will be presented in a theoretical approach how the process parameters and the raw materials characteristics may affect the three layer polyethylene anticorrosion coating final properties. (author)

  20. Structural characterization and corrosive property of Ni-P/CeO2composite coating

    Institute of Scientific and Technical Information of China (English)

    JIN Huiming; JIANG Shihang; ZHANG Linnan

    2009-01-01

    Electroless Ni-P/nano-CeO2 composite coating was prepared in acidic condition, and its microstructure and corrosive property were compared with its CeO2-free counterpart. Scanning electronic microscopy (SEM), transmission electronic microscopy (TEM), X-ray diffraction spectrometer (XRD), and differential scanning calorimeter (DSC) were used to examine surface morphology and microstructure of the coating. Corrosive investigation was carried out in 3%NaCl+5%H2SO4 solution. The results showed that Ni-P coating had partial amorphous structure mixed with nanocrystals, whereas the Ni-P/CeO2 coating had perfect amorphous structure. In high temperature condition, Ni3P precipitation and Ni crystallization occurred in both coatings but at different temperatures, whereas the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels. The anticorrosion property and passivity were improved in the CeO2-containing coating due to its less liability to undergo local-cell corrosion than its CeO2-free counterpart. During the co-deposition process, some Cen+ (n=3, 4) ions may be adsorbed to the metal/solution interface, hinder nickel's crystal-typed deposition and promote phosphorous deposition. The nano-CeO2 doping finally resulted in the coating' perfect amorphous structure and good anti-corrosive property.

  1. Lanthanum-exchanged zeolite and clay as anticorrosive pigments for galvanized steel

    Institute of Scientific and Technical Information of China (English)

    S. Roselli; N. Bellotti; C. Deyá; M. Revuelta; B. del Amo; R. Romagnoli

    2014-01-01

    A wide variety of inhibitive pigments is now being offered as possible alternatives to chromate and lead compounds for painted metals protection. Unfortunately, the most wide spread of these substitute pigments, zinc phosphate, has, at present, raised some environmental concern because phosphate causes the eutrophication of water courses and zinc itself is toxic. The aim of this re-search was to study the anticorrosive performance of a mixture consisting of zinc phosphate, modified zeolite and clay (bentonite) in order to diminish phosphate content in paints. The zeolite and the clay were exchanged with La(III) ions, as inorganic green inhibitor. In the first step, the anticorrosion protection by La(III) ions in solution was assessed by electrochemical tests. In the second step, an epoxy-polyamide paint formulated with the pigment mixture applied on galvanized panels was studied by salt spray test and electro-chemical noise measurements (ENM). The results showed that it was possible to replace part of the zinc phosphate content in the paint with the exchanged zeolite and the clay.

  2. [Research on anti-corrosion of Thiobacillus for the geopolymer solidification MSWI fly ash].

    Science.gov (United States)

    Jin, Man-Tong; Sun, Xin; Dong, Hai-Li; Jin, Zan-Fang

    2012-09-01

    In order to discuss the anti-Thiobacillus corrosion performance of geopolymer solidification MSWI fly ash, the research simulated the Thiobacillus corrosion process by experiment, investigated the change of mass, compressive strength, leaching concentration. The results showed that geopolymer had a good anti-corrosion ability: weight loss within 1%, the compressive strength still reached 21.88 MPa after 28 days, the corrosion resistance coefficient was above 0.9. The maximum leaching concentration of Cr, Cu, Zn, Cd, Hg, Pb were 107.7 microg x L(-1), 22.71 microg x L(-1), 39.18 microg x L(-1), 0.56 microg x L(-1), 34.84 microg x L(-1) and 3.03 microg x L(-1), respectively. And the leaching concentration of geopolymer reduced with the immersion time, showed a good anti-Thiobacillus corrosion performance. Through the X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope spectra of geopolymer, we investigated the microstructure and mechanism of geopolymer anti-corrosion.

  3. Corrosion resistance, composition and structure of RE chemical conversion coating on magnesium alloy

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Golden yellow rare earths chemical conversion coating was obtained on the surface of magnesium alloy by immersing in cerium sulfate solution.The corrosion resistance of RE conversion coating was evaluated using immersion test and potentiodynamic polarization measurements in 3.5%NaCl solution.The morphologies of samples before corrosion and after corrosion were observed by SEM.The structures and compositions of the RE conversion coating were studied by means of XPS.XRD and IR.The results show that,the conversion coating consists of mainly two kinds of element Ce and O,the valences of cerium are+3 and+4.and OH exists in the coating.The anti-corrosion property of magnesium alloy is increased obviously by rare earths conversion coating,Its self-corrosion current density decreases and the coating has self-repairing capability in the corrosion process in 3.5%NaCl solution.

  4. Cerium oxide as conversion coating for the corrosion protection of aluminum

    Directory of Open Access Journals (Sweden)

    JELENA GULICOVSKI

    2013-11-01

    Full Text Available CeO2 coatings were formed on the aluminum after Al surface preparation, by dripping the ceria sol, previously prepared by forced hydrolysis of Ce(NO34. The anticorrosive properties of ceria coatings were investigated by the electrochemical impedance spectroscopy (EIS during the exposure to 0.03 % NaCl. The morphology of the coatings was examined by the scanning electron microscopy (SEM. EIS data indicated considerably larger corrosion resistance of CeO2-coated aluminum than for bare Al. The corrosion processes on Al below CeO2 coating are subjected to more pronounced diffusion limitations in comparison to the processes below passive aluminum oxide film, as the consequence of the formation of highly compact protective coating. The results show that the deposition of ceria coatings is an effective way to improve corrosion resistance for aluminum.

  5. Evaluation of anticorrosive films on copper by a low-energy photoelectron emission measurement. Tei energy hikari denshi ni yoru do hyomen boshoku himaku no hyoka

    Energy Technology Data Exchange (ETDEWEB)

    Asabe, Y.; Wakasa, H.; Mori, S. (Iwate Univ., Iwate (Japan). Faculty of Engineering)

    1991-11-15

    As a result of investigation on the effect of inhibitor based on the emission initiating energy E{sub t} (threshold) of low energy photoelectron emitted from the surface of the BTA (benzotriazole) treated specimen, it is found that E{sub t} shifts to the high energy side if copper is treated with effective inhibitor BTA, but no shift is observed with iron even if it is treated with BTA. The shift of E{sub t} is eminent at BTA concentration of larger than 1{times} 10{sup {minus}4} mol/l, which agrees well with the tendency of corrosion inhibition obtained from the polarization curves. When copper specimens are coated with films of oxide and others, E{sub t} shifts to the high energy side. From this fact, the shift of E{sub t} to the high energy side when copper is treated with BTA can be considered to be corresponding to the thickness of anticorrosion film. The effect of inhibitor on copper surface can be evaluated easily by this method even in low BTA concentration region. 9 refs., 9 figs., 1 tab.

  6. Enhancement of the corrosion protection of electroless Ni–P coating by deposition of sonosynthesized ZnO nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Sharifalhoseini, Zahra [Sonochemical Research Center, Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91779 Mashhad (Iran, Islamic Republic of); Entezari, Mohammad H., E-mail: entezari@um.ac.ir [Sonochemical Research Center, Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91779 Mashhad (Iran, Islamic Republic of); Environmental Chemistry Research Center, Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91779 Mashhad (Iran, Islamic Republic of)

    2015-10-01

    Graphical abstract: Enhancement of the corrosion protection of electroless Ni–P layer by ZnO nanoparticles deposition and the comparison with the classical and sonochemical Ni–P coatings. - Highlights: • Unique effects of ultrasound were investigated on the anticorrosive performance of electroless Ni–P coating. • Sonoynthesis of ZnO NPs and its deposition were performed on the surface of Ni–P coating. • ZnO as an anticorrosive has a critical role in the multifunctional surfaces. • Electrochemical properties of all fabricated samples were compared with each other. - Abstract: Ni–P coatings were deposited through electroless nickel plating in the presence and absence of ultrasound. The simultaneous synthesis of ZnO nanoparticle and its deposition under ultrasound were also carried out on the surface of Ni–P layer prepared by the classical method. The morphology of the surfaces and the chemical composition were determined by scanning electron microscopy(SEM) and energy dispersive spectroscopy (EDS), respectively. Electrochemical techniques were applied for the corrosion behavior studies. The Ni–P layer deposited by ultrasound showed a higher anticorrosive property than the layer deposited by the classical method. The ZnO nanoparticles deposited on the surface of Ni–P layer significantly improved the corrosion resistance.

  7. 2-Mercaptobenzothiazole doped chitosan/11-alkanethiolate acid composite coating: Dual function for copper protection

    Science.gov (United States)

    Bao, Qi; Zhang, Dun; Wan, Yi

    2011-10-01

    Chitosan (CS) hydrogel loaded with the well-known corrosion inhibitor 2-mercaptobenzothiazole (MBT) has been introduced into a composite coating to improve copper protection. This composite coating, which has both anticorrosion and antibacterial properties, was fabricated onto the surface of copper by combining a simple self-assembled monolayer technique with a sol-gel method. The anti-corrosion ability of the coating in 3.5 wt.% NaCl solution was investigated by electrochemical methods including potentiodynamic polarization and electrochemical impedance spectroscopy. The protection efficiency of the coating is 97.70%, calculated on the basis of the corrosion current density. The stability and integrity of the composite coating were evaluated by field emission scanning electron microscopy (FESEM) and energy dispersive spectrometry (EDS). The FESEM and EDS results suggest that the composite coating endows the copper substrate with antibacterial properties, as untreated bare copper underwent microbiologically influenced corrosion in the presence of sulphate reducing bacteria (SRB). This antibacterial feature was further confirmed by the SRB culture method. In a 3.5% NaCl solution and highly corrosive SRB culture media, the as-prepared CS based composite coating gave corrosion protection by exhibiting better barrier effects against the attack of aggressive environments.

  8. Electrodeposition and Corrosion Resistance Properties of Zn-Ni/TiO2 Nano composite Coatings

    Directory of Open Access Journals (Sweden)

    B. M. Praveen

    2011-01-01

    Full Text Available Nano sized TiO2 particles were prepared by sol-gel method. TiO2 nano particles were dispersed in zinc-nickel sulphate electrolyte and thin film of Zn-Ni-TiO2 composite was generated by electrodeposition on mild steel plates. The effect of TiO2 on the corrosion behavior and hardness of the composite coatings was investigated. The film was tested for its corrosion resistance property using electrochemical, weight loss, and salt spray methods. The paper revealed higher resistance of composite coating to corrosion. Microhardness of the composite coating was determined. Scanning electron microscope images and X-ray diffraction patterns of coating revealed its fine-grain nature. Average crystalline size of the composite coating was calculated. The anticorrosion mechanism of the composite coating was also discussed.

  9. Development of Laser Surface Technologies for Anti-Corrosion on Magnesium Alloys: a Review

    Science.gov (United States)

    Sun, Rujian; Guan, Yingchun; Zhu, Ying

    2016-03-01

    Magnesium (Mg) alloys have been increasingly used in industries and biomaterial fields due to low density, high specific strength and biodegradability. However, poor surface-related properties are major factors that limit their practical applications. This paper mainly focuses on laser-based anti-corrosion technologies for Mg alloys, beginning with a brief review of conventional methods, and then demonstrates the feasibility of laser surface technologies including laser surface melting (LSM), laser surface alloying (LSA), laser surface cladding (LSC) and laser shock peening (LSP) in achieving enhancement of corrosion resistance. The mechanism and capability of each technique in corrosion resistance is carefully discussed. Finally, an outlook of the development of laser surface technology for Mg alloy is further concluded, aiming to serve as a guide for further research both in industry applications and biomedical devices.

  10. ANTICORROSION POTENTIAL OF HYDRALAZINE FOR CORROSION OF MILD STEEL IN 1M HYDROCHLORIC ACID SOLUTION

    Directory of Open Access Journals (Sweden)

    B. M. Prasanna

    2015-05-01

    Full Text Available Anticorrosion potential of mild steel by Hydralazine as corrosion inhibitor for mild steel in 1M hydrochloric acid was investigated by chemical and electrochemical measurements at 303-333 K temperature. The maximum inhibition efficiency of inhibitor by Weight loss method is around 90%, Tafel polarization method is around 85%; electrochemical impedance spectroscopy measurement around 90% at 1250 ppm of Hydralazine in. The result shows that the inhibition efficiency increases with I 1M hydrochloric acid. Hydralazine acts as a mixed type inhibitor which inhibits the corrosion of mild steel due to the adsorption on metal surface. This adsorption system obeys the Langmuir adsorption isotherm.Activation parameters explains the effect of temperature with inhibition efficiency of inhibitor molecule.SEM images of inhibited mild steel strips shows a formation of passive protective film over the surface.

  11. Energy conservation research of dehumidification system for main cable anticorrosion of suspension bridge

    Institute of Scientific and Technical Information of China (English)

    Chen Ce; Fan Liangkai; Feng Zhaoxiang; Pen Guanzhong

    2011-01-01

    The necessity of the main cable anticorrosion for suspension bridge is described, and operating principles and composition of main cable dehumidification system are analyzed. An idea using the waste heat of high temperature outlet air of dehumidification system to heat up regeneration air of rotary-type dehumidifier is put forward in this paper. The concrete scheme is to install a heat exchanger on air-out pipeline of roots blower and air-in pipeline of regeneration electric heater of rotary dehumidifier. Air preheated by the heat exchanger enters regeneration electric heater of rotary-type dehumidifier. Energy conservation of main cable dehumidification system for the Yangtze River highway bridge is calculated, and the results show that energy conservation rate can reach 44 %.

  12. Preparation Technology and Performances of Zn-Cr Coating on Sintered NdFeB Permanent Magnet

    Institute of Scientific and Technical Information of China (English)

    Yu Shengxue; Chen Ling

    2006-01-01

    Zn-Cr coating was prepared on the surface of sintered NdFeB permanent magnet samples and preparation parameters were established.The anticorrosive property of Zn-Cr coating on NdFeB was studied by whole-immersion test in NaCl solution and compared with that of zinc plating and nickel plating on NdFeB.Open-circuit potential and self-corrosion current of NdFeB samples with and without Zn-Cr coating were measured.The micro-morphology and composition of Zn-Cr coating were analyzed through SEM, XPS, EDS and XRD.The effect of Zn-Cr coating on magnetic property of NdFeB magnet was also investigated.It is exposed that Zn-Cr coating is anodic type coating for NdFeB magnet, and provided substrate electrochemical protection, barrier protection and passivation protection.The anticorrosion property of NdFeB magnet is obviously enhanced by Zn-Cr coating while the magnet property of NdFeB magnet changed little.

  13. 天然海水中聚吡咯膜的防微生物附着及防腐蚀性能%Antimicrobial Adhesion and Anticorrosion Properties of Polypyrrole Film in Natural Seawater†

    Institute of Scientific and Technical Information of China (English)

    马晓丹; 张志明; 于良民

    2016-01-01

    采用恒电流法在316 L 不锈钢电极表面合成聚吡咯(PPy),通过开路电位、生物显微镜(BM)、 Tafel极化曲线及电化学交流阻抗(EIS)研究了聚吡咯防止微生物附着及防腐蚀特性.研究表明,沉积聚吡咯的316 L 不锈钢电极浸泡在天然海水中(0~20 d),开路电位基本保持不变,表明电化学合成的聚吡咯膜有良好的防止微生物附着能力,并通过生物显微镜进行了验证,且在浸泡的过程中其腐蚀电流密度维持在10-7 mA/ cm2,表现出良好的防腐蚀特性;浸泡50 d 后,其防腐蚀效率仍高达97.45%.因此,电化学合成的聚吡咯具有优异的防止微生物附着和防腐蚀特性.%Polypyrrole was deposited on the surface of the 316L stainless steel electrode through galvanostatic method, and the antifouling property of the polypyrrole film in natural seawater was analyzed via open circuit potential, biological microscope, Tafel polarization curve and electrochemical impedance spectroscopy. It was found that the open circuit potential of the stainless steel electrode coated with polypyrrole was stable after 20 d of the immersion in the natural seawater, which indicates that the polypyrrole had a good ability to prevent the microorganism from attaching. This can be confirmed by the biological microscope. And the corrosion current density maintained at 10-7 mA/ cm2 and showed good anticorrosion performance. The anticorrosion efficiency can still reach up 97. 45% even the electrode is immersed in natural seawater for 50 d. Therefore, it could be concluded that the polypyrrole synthesized by electrochemical method exhibited good properties in the prevention of microbial attachment and good anticorrosion performance.

  14. New pattern Zn-Al-Mg-RE coating technics for steel structure sustainable design

    Institute of Scientific and Technical Information of China (English)

    LIU Yan; XU Bin-shi; ZHU Zi-xin; LI Zhuo-xin; MA Jie

    2005-01-01

    Based on the advanced integrated technology of materials preparation and formation, a new pattern ZnAl-Mg-RE anti-corrosion coating for steel structure sustainable design was manufactured by cored wires and high velocity arc spraying (HVAS) technologies. The developments of thermally sprayed coatings for steel structure protection were described. Based on Al, Zn, Zn-Al and Zn-Al-Mg coatings, the anti-corrosion properties of new-pattern Zn-Al-Mg-RE coating were evaluated through electrochemical methods including electrochemical polarization and electrochemical impedance spectroscopy (EIS) coupled with SEM and XRD. The models of Zn-Al-Mg-RE coating undergoing corrosion with the initial pinhole defect and the latter with accelerated products were also discussed. The results show that Zn-Al-Mg-RE coating exhibites excellent corrosion resistance for long-term immersion, which is helpful for the sustainable design of steel structure in aggressive corrosion conditions. And the corrosion products seem to possess certain self-sealing function.

  15. Corrosion Behaviour of a Silane Protective Coating for NdFeB Magnets in Dentistry

    Directory of Open Access Journals (Sweden)

    Luigi Calabrese

    2015-01-01

    Full Text Available The corrosion behavior of coated and uncoated Ni/Cu/Ni rare earth magnets was assessed at increasing steps with a multilayering silanization procedure. Magnets’ durability was analyzed in Fusayama synthetic saliva solution in order to evaluate their application in dental field. Corrosion performance was evaluated by using polarization and electrochemical impedance spectroscopy in synthetic saliva solution up to 72 hours of continuous immersion. The results show that the addition of silane layers significantly improved anticorrosion properties. The coating and aging effects, in synthetic saliva solution, on magnetic field were evaluated by means of cyclic force-displacement curves.

  16. Self-healing epoxy coating containing linseed oil loaded micro capsules for steel

    Directory of Open Access Journals (Sweden)

    M. Mahmoudian

    2016-12-01

    Full Text Available Effectiveness of epoxy coatings filled with linseed oil loaded micro capsules was investigated for healing the cracks generated on steel. Micro capsules were synthesized by in-situ polymerization method. Characteristics of these micro capsules were studied by Fourier-transform infrared spectroscopy (FTIR, Thermal gravimetric analysis, Scanning electron microscopy (SEM for chemical investigation, thermal stability and surface morphology respectively. Anti-corrosion effect of prepared coating was investigated by electrochemical impedance spectroscopy (EIS. Cracks in a paint film were successfully healed when linseed oil was released from microcapsules ruptured under simulated mechanical action.Linseed oil healed area was found to prevent corrosion of the substrate.

  17. Microstructures and Key Properties of Mechanically Deposited Zn-Al Coatings

    Institute of Scientific and Technical Information of China (English)

    WANG Shengmin; HE Mingyi; ZHAO Xiaojun; PENG Zenghua; LIU Li

    2009-01-01

    Zn-Al coatings can provide protection to exposed steel parts in most environments. For this reason, the investigation of Zn-Al coatings become very popular in recent years. In order to study the microstructures and properties of mechanically deposited Zn-Al coating, zinc powders and aluminum powders were used to deposit Zn-Al coating by mechanical plating. The microstructures, phase constitutes and compositions of the coating were observed and analyzed with optical microscopy (OM), scanning electron microscopy(SEM), X-ray diffraction(XRD) and X-ray energy-dispersive spectroscopy(EDS). The results of observation show that the coating consists of almost spherically shaped zinc particles point contacting with each other; the coatings are composed of zinc particles, aluminum particles, interstice, and tin; extra fine zinc powders and some smaller interspersed inclusions are positioned in the interstices. Porosity and thickness of the coating were tested by ferroxyl test and magnetic method. The corrosion resistance of coatings was studied by neutral salt spraying test(NSS) , immersion test and electrochemical polarization. It is found that the thickness of the coating dose lacks uniformity, with an uneven thickness distribution and an average variation of approximately 2-5μm; the coating can afford cathodic protection to the steel substrate; the corrosion resistance of Zn-Al coatings is better than that of the mechanically plated zinc coatings with same thickness. These conclusions can be applied to improve anti-corrosion performance by mechanically deposit Zn-Al coatings.

  18. Crash-Induced Vibration and Safety Assessment of Breakaway-Type Post Structures Made of High Anticorrosion Steels

    Directory of Open Access Journals (Sweden)

    Sang-Youl Lee

    2016-01-01

    Full Text Available This study deals with car crash effects and passenger safety assessment of post structures with breakaway types using high performance steel materials. To disperse the impact force when a car crashes into a post, the post could be designed with a breakaway feature. In this study, we used a new high anticorrosion steel for the development of advanced breakaways. Based on the improved Cowper-Symonds model, specific physical properties to the high anticorrosion steel were determined. In particular, the complex mechanism of breakaways was studied using various parameters. The parametric studies are focused on the various effects of car crash on the structural performance and passenger safety of breakaway-type posts. The combined effects of using different steel materials on the dynamic behavers are also investigated.

  19. Mechanical and corrosion resistance properties of TiO2 nanoparticles reinforced Ni coating by electrodeposition

    Science.gov (United States)

    Shao, W.; Nabb, D.; Renevier, N.; Sherrington, I.; Luo, J. K.

    2012-09-01

    Coatings have been widely used in engineering and decoration to protect components and products and enhance their life span. Nickel (Ni) is one of the most important hard coatings. Improvement in its tribological and mechanical properties would greatly enhance its use in industry. Nanocomposite coatings of metals with various reinforced nanoparticles have been developed in last few decades. Titania (TiO2) exhibit excellent mechanical properties. It is believed that TiO2 incorporation in Ni matrix will improve the properties of Ni coatings significantly. The main purpose of the current work is to investigate the mechanical and anti-corrosion properties of the electroplated nickel nanocomposite with a small percentage of TiO2. The surface morphology of nanocomposite coating was characterized by scanning electron microscopy (SEM). The hardness of the nanocoating was carried out using micromaterials nanoplatform. The sliding wear rate of the coating at room temperature in dry condition was assessed by a reciprocating ball-on-disk computer-controlled oscillating tribotester. The results showed the nanocomposite coatings have a smoother and more compact surface than the pure Ni layer and have higher hardness and lower wear rate than the pure Ni coating. The anti-corrosion property of nanocomposite coating was carried out in 3.5% NaCl and high concentrated 35% NaCl solution, respectively. The results also showed that the nanocomposite coating improves the corrosion resistance significantly. This present work reveals that incorporation of TiO2 in nickel nanocomposite coating can achieve improved corrosion resistance and mechanical properties of both hardness and wear resistance performances, and the improvement becomes stronger as the content of TiO2 is increased.

  20. Aminobenzoate modified MgAl hydrotalcites as a novel smart additive of reinforced concrete for anticorrosion applications

    NARCIS (Netherlands)

    Yang, Z.; Fischer, H.R.; Cerezo, J.; Mol, J.M.C.; Polder, R.B.

    2013-01-01

    A carbonate form of MgAl hydrotalcite, Mg(2)Al-CO3 and its p-aminobenzoate (pAB) modified derivative, Mg(2)Al-pAB, were synthesized and characterized by means of XRD, FT-IR and TG/DSC. The anticorrosion behavior of Mg(2)Al-pAB was evaluated based on open circuit potential (OCP) of carbon steel in si

  1. Temporal and spatial variation in the fouling of silicone coatings in Pearl Harbor, Hawaii.

    Science.gov (United States)

    Holm, E R; Nedved, B T; Phillips, N; Deangelis, K L; Hadfield, M G; Smith, C M

    2000-01-01

    An antifouling or foul-release coating cannot be globally effective if it does not perform well in a range of environmental conditions, against a diversity of fouling organisms. From 1996 to 1998, the field test sites participating in the United States Navy's Office of Naval Research 6.2 Biofouling program examined global variation in the performance of 3 silicone foul-release coatings, viz. GE RTV11, Dow Corning RTV 3140, and Intersleek (International Coatings Ltd), together with a control anticorrosive coating (Ameron Protective Coatings F-150 series). At the University of Hawaii's test site in Pearl Harbor, significant differences were observed among the coatings in the rate of accumulation of fouling. The control coating failed rapidly; after 180-220 d immersion a community dominated by molluscs and sponges developed that persisted for the remainder of the experiment. Fouling of the GE and Dow Corning silicone coatings was slower, but eventually reached a similar community structure and coverage as the control coatings. The Intersleek coating remained lightly fouled throughout the experiment. Spatial variation in the structure of the community fouling the coatings was observed, but not in the extent of fouling. The rate of accumulation of fouling reflected differences among the coatings in adhesion of the tubeworm Hydroides elegans. The surface properties of these coatings may have affected the rate of fouling and the structure of the fouling community through their influence on larval settlement and subsequent interactions with other residents, predators, and the physical environment.

  2. Technical research on anticorrosion of Puguang gathering transferring pipeline%普光气田集输管线防腐蚀技术研究

    Institute of Scientific and Technical Information of China (English)

    董利刚; 王利波; 胡良培; 吴钰

    2016-01-01

    普光气田地处山区,地势险峻、地质条件极其复杂,且为高含硫化氢气田,其集输埋地管线已受到了严重的内外壁腐蚀。针对由于土壤的侵蚀带来的外壁腐蚀,研究了防腐涂层和阴极保护方法;针对主要是H2S/CO2腐蚀的内壁腐蚀,首先从抗硫管材上进行了选择,其次对缓蚀剂加注量进行了优化,同时采用腐蚀监测数据对比分析法,使管壁的腐蚀得到了防护和监控。%Puguang gas field is located in a mountainous area,has a rugged hypsography and extremely complicated geological condition,mostly are hydrogen sulfide gas field,its buried gathering pipelines have got severe inner and outer wall corrosion. In view of the outer wall corrosion brought by erosion of soil,this paper researched the anticorrosion coat and cathodic protection method. In view of inner wall mainly H2S/CO2 corroded,firstly the selection was made from anti-sulfur pipeline material,secondly the optimization was made to the injection amount of the corrosion inhibitor,and the comparative analysis method of corrosion monitoring data was used.

  3. Deposition of electroless Ni-P/Ni-W-P duplex coatings on AZ91D magnesium alloy

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    The electroless Ni-P/Ni-W-P duplex coatings were deposited directly on AZ91D magnesium alloy by all acid-sulfate nickel bath.Nickel suitIhate and sodium tungstate were used as metal ion sources and sodium hypophosphite was used as reducing agent.The coating was characterized for its structure,morphologies,microhardness and corrosion properties.The presence of dense and coarse nodules in the duplex coatings Was observed by SEM and EDS.Tungsten content in Ni-P/Ni-W-P alloy is about 0.65%(mass fraction)and the phosphorus content is 8.1 8%(mass fraction).The microhardness of the coatings is 622 VHN.The coating shows good adhesion to the substrate.The results of electrochemical analysis,the porosity and the immersion test show that Ni-P/Ni-W-P duplex coatings possess noble anticorrosion properties to protect the AZ91D magnesium alloy.

  4. Graphene/Epoxy Coating as Multifunctional Material for Aircraft Structures

    Directory of Open Access Journals (Sweden)

    Tullio Monetta

    2015-06-01

    Full Text Available Recently, the use of graphene as a conductive nanofiller in the preparation of inorganic/polymer nanocomposites has attracted increasing interest in the aerospace field. The reason for this is the possibility of overcoming problems strictly connected to the aircraft structures, such as electrical conductivity and thus lightning strike protection. In addition, graphene is an ideal candidate to enhance the anti-corrosion properties of the resin, since it absorbs most of the light and provides hydrophobicity for repelling water. An important aspect of these multifunctional materials is that all these improvements can be realized even at very low filler loadings in the polymer matrix. In this work, graphene nanoflakes were incorporated into a water-based epoxy resin, and then the hybrid coating was applied to Al 2024-T3 samples. The addition of graphene considerably improved some physical properties of the hybrid coating as demonstrated by Electrochemical Impedance Spectroscopy (EIS analysis, ameliorating anti-corrosion performances of raw material. DSC measurements and Cross-cut Test showed that graphene did not affect the curing process or the adhesion properties. Moreover, an increment of water contact angle was displayed.

  5. A superhydrophilic nitinol shape memory alloy with enhanced anti-biofouling and anti-corrosion properties.

    Science.gov (United States)

    Song, K; Min, T; Jung, J-Y; Shin, D; Nam, Y

    2016-01-01

    This work reports on a nitinol (NiTi) surface modification scheme based on a chemical oxidation method, and characterizes its effects on wetting, biofouling and corrosion. The scheme developed is also compared with selected previous oxidation methods. The proposed method turns NiTi into superhydrophilic in ~5 min, and the static contact angle and contact angle hysteresis were measured to be ~7° and ~12°, respectively. In the PRP (platelet rich plasma) test, platelet adhesion was reduced by ~89% and ~77% respectively, compared with the original NiTi and the NiTi treated with the previous chemical oxidation scheme. The method developed provides a high (~1.1 V) breakdown voltage, which surpasses the ASTM standard for intervascular medical devices. It also provides higher superhydrophilicity, hemo-compatibility and anti-corrosion resistance than previous oxidation schemes, with a significantly reduced process time (~5 min), and will help the development of high performance NiTi devices.

  6. The Synthesis, Characterization and Comparative Anticorrosion Study of Some Organotin(IV 4-Chlorobenzoates

    Directory of Open Access Journals (Sweden)

    Hastin Kurniasih

    2015-12-01

    Full Text Available The synthesis of 3 compounds of a series of dibutyl(IV di-4-chlorobenzoate, diphenyl(IV di-4-chlorobenzoate and triphenyltin(IV 4-chlorobenzoate have successfully been performed by reacting the dibutyltin(IV dichloride, diphenyltin(IV dichloride and triphenyltin(IV chloride respectively via the dibutyltin(IV oxide, diphenyltin(IV dihydroxide and triphenyltin(IV hydroxide with 4-chlorobenzoic acid. All compounds synthesized were well characterized by 1H and 13C NMR, IR and UV-Vis spectroscopies as well as based on the microanalytical data. The anticorrosion activity of these compounds were tested on Hot Roller Plate (HRP mild steel in DMSO-HCl solution using potentiodynamic method. The results revealed that the triphenyltin(IV 4-chlorobenzoate clearly showed the strongest inhibitor activity compared to the other derivatives, while diphenyltin(IV compounds were better than that of dibutyltin(IV analogous. The results reported here indicated that the optimal activity were depended on the ligand attached to the metal centre and might also be related to the number of carbon atoms present in the organotin(IV used.

  7. 《建筑钢结构防腐蚀技术规程》设计使用介绍%Introduction of design application of Technical specification for anticorrosion of building steel structure

    Institute of Scientific and Technical Information of China (English)

    胡伦基

    2012-01-01

    Major contents of relevant anticorrosion mechanism and anticorrosion design of Technical specification for anticorrosion of building steel structure were introduced.It included the judgement of corrosivity grade;corrosion allowance;anticorrosion structure measure;rust-clearing method and grade classification;design principle and thickness of anticorrosion covering layer;cooperation use of anticorrosive painting;applied environment,metal selection of metal thermal spraying and occlude treatment of heat spraying layer;anticorrosive and fireproofing of steel structure.Anticorrosion design examples of building steel structure were also given.%介绍了《建筑钢结构防腐蚀技术规程》(JGJ/T 251—2011)有关的防腐蚀机理和防腐蚀设计的主要内容。主要包括:腐蚀性等级的判定,腐蚀裕量,防腐蚀构造措施,除锈方法和等级划分,防腐蚀保护层的设计原则、厚度选定,防腐涂装的配套使用,金属热喷涂的使用环境、热喷金属选择、热喷涂层封闭处理,钢结构防腐与防火。并通过算例介绍建筑钢结构防腐蚀的设计。

  8. Anticorrosion Performance of Epoxy Coatings Containing Small Amount of Inherently Conducting PEDOT/PSS on Hull Steel in Seawater

    Institute of Scientific and Technical Information of China (English)

    Jian Hou; Guang Zhu; Jingkun Xu; Huajian Liu

    2013-01-01

    Corrosion protection of the hull steel by the conventional epoxy paint containing a small amount of commercial poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS),which is one of the most popular and successful inherently conducting polymers as the corrosion inhibitor was studied.The corrosion behavior of the samples was investigated in seawater by electrochemical impedance spectroscopy and open circuit potential.Scanning electron microscopy was used to observe the surface morphology of the samples after corrosion.It was found that adding a small amount of PEDOT/PSS to the epoxy resin can significantly improve its corrosion protection.

  9. Novel Thiol-Ene Hybrid Coating for Metal Protection

    Directory of Open Access Journals (Sweden)

    Mona Taghavikish

    2016-04-01

    Full Text Available A novel hybrid anticorrosion coating with dual network of inorganic (Si–O–Si and organic bonds (C–S–C was prepared on metal through an in situ sol-gel and thiol-ene click reaction. This novel interfacial thin film coating incorporates (3-mercaptopropyl trimethoxysilane (MPTS and 1,4-di(vinylimidazolium butane bisbromide based polymerizable ionic liquid (PIL to form a thiol-ene based photo-polymerized film, which on subsequent sol-gel reaction forms a thin hybrid interfacial layer on metal surface. On top of this PIL hybrid film, a self-assembled nanophase particle (SNAP coating was employed to prepare a multilayer thin film coating for better corrosion protection and barrier performance. The novel PIL hybrid film was characterised for structure and properties using Fourier transform infrared spectroscopy (FTIR, differential scanning calorimetry (DSC, and thermogravimetric analysis (TGA. The corrosion protection performance of the multilayer coating was examined using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS. The results reveal that this novel double layer coating on metal offers excellent protection against corrosion and has remarkably improved the barrier effect of the coating.

  10. Fabrication of silica-decorated graphene oxide nanohybrids and the properties of composite epoxy coatings research

    Science.gov (United States)

    Ma, Yu; Di, Haihui; Yu, Zongxue; Liang, Ling; Lv, Liang; Pan, Yang; Zhang, Yangyong; Yin, Di

    2016-01-01

    With the purpose of preparing anticorrosive coatings, solvent-based epoxy resins often serve as raw material. Unfortunately, plentiful micro-pores are fabricated via solvent evaporation in the resin' curing process, which is an intrinsic shortcoming and it is thus necessary to obstacle their micro-pore for enhancing antiseptic property. To reduce the intrinsic defect and increase the corrosion resistance of coating, we synthesize a series of SiO2-GO hybrids through anchoring silica (SiO2) on graphene oxide (GO) sheets with the help of 3-aminopropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane, and disperse the hybrids into epoxy resin at a low weight fraction of 2%. Furthermore, we investigate the appropriate preparation proportion of SiO2-GO hybrids (namely: SiO2-GO (1:5)). The electrochemical impedance spectroscopy (EIS) test and coatings' morphology monitoring in corrosion process reveal that the anticorrosive performance of epoxy coatings is significantly enhanced by incorporation of SiO2-GO (1:5) hybrids to epoxy compared with neat epoxy and other nanofillers including SiO2 or GO at the same contents. The superiority of the SiO2-GO (1:5) hybrids is related to their excellent dispersion in resin and sheet-like structure.

  11. Electrophoretic deposition and electrochemical behavior of novel graphene oxide-hyaluronic acid-hydroxyapatite nanocomposite coatings

    Science.gov (United States)

    Li, Ming; Liu, Qian; Jia, Zhaojun; Xu, Xuchen; Shi, Yuying; Cheng, Yan; Zheng, Yufeng; Xi, Tingfei; Wei, Shicheng

    2013-11-01

    Novel ternary graphene oxide-hyaluronic acid-hydroxyapatite (GO-HY-HA) nanocomposite coatings were prepared on Ti substrate using anodic electrophoretic deposition (EPD). Hyaluronic acid was employed as charging additive and dispersion agent during EPD. The kinetics and mechanism of the deposition, and the microstructure of the coated samples were investigated using scanning electron microscopy, X-ray diffraction, Raman spectrum, thermo-gravimetric analysis, and microscopic Fourier transform infrared analysis. The results showed that the addition of GO sheets into the HY-HA suspensions could increase the deposition rate and inhibit cracks creation and propagation in the coatings. The corrosion resistant of the resulting samples were evaluated using potentiodynamic polarization method in simulated body fluid, and the GO-HY-HA coatings could effectively improve the anti-corrosion property of the Ti substrate.

  12. Investigation of hexagonal boron nitride as an atomically thin corrosion passivation coating in aqueous solution

    Science.gov (United States)

    Zhang, Jing; Yang, Yingchao; Lou, Jun

    2016-09-01

    Hexagonal boron nitride (h-BN) atomic layers were utilized as a passivation coating in this study. A large-area continuous h-BN thin film was grown on nickel foil using a chemical vapor deposition method and then transferred onto sputtered copper as a corrosion passivation coating. The corrosion passivation performance in a Na2SO4 solution of bare and coated copper was investigated by electrochemical methods including cyclic voltammetry (CV), Tafel polarization and electrochemical impedance spectroscopy (EIS). CV and Tafel analysis indicate that the h-BN coating could effectively suppress the anodic dissolution of copper. The EIS fitting result suggests that defects are the dominant leakage source on h-BN films, and improved anti-corrosion performances could be achieved by further passivating these defects.

  13. Corrosion Resistance of Electroless Ni-Cu-P Ternary Alloy Coatings in Acidic and Neutral Corrosive Mediums

    Directory of Open Access Journals (Sweden)

    Mbouillé Cissé

    2010-01-01

    Full Text Available Electroless Ni-Cu-P alloy coatings were deposited on the ordinary steel substrate in an acidic hypophosphite-type plating bath. These coatings were characterized by a scanning electron microscope (SEM and an X-ray diffraction. The micrograph shows that coating presents a nodular aspect and is relatively homogeneous and very smooth. The EDX analysis shows that the coating contains 12 wt.% of phosphorus element with a predominance of nickel element. In addition, the anticorrosion properties of the Ni-Cu-P coatings in 1 M HCl, 1 M H2SO4, and 3% NaCl solutions were investigated using Tafel polarization curves, electrochemical impedance spectroscopy, and SEM/EDX analysis. The result showed a marginal improvement in corrosion resistance in 3% NaCl solution compared to acidic medium. It also showed that the corrosion mechanism depends on the nature of the solution.

  14. HIGH-PERFORMANCE COATING MATERIALS

    Energy Technology Data Exchange (ETDEWEB)

    SUGAMA,T.

    2007-01-01

    Corrosion, erosion, oxidation, and fouling by scale deposits impose critical issues in selecting the metal components used at geothermal power plants operating at brine temperatures up to 300 C. Replacing these components is very costly and time consuming. Currently, components made of titanium alloy and stainless steel commonly are employed for dealing with these problems. However, another major consideration in using these metals is not only that they are considerably more expensive than carbon steel, but also the susceptibility of corrosion-preventing passive oxide layers that develop on their outermost surface sites to reactions with brine-induced scales, such as silicate, silica, and calcite. Such reactions lead to the formation of strong interfacial bonds between the scales and oxide layers, causing the accumulation of multiple layers of scales, and the impairment of the plant component's function and efficacy; furthermore, a substantial amount of time is entailed in removing them. This cleaning operation essential for reusing the components is one of the factors causing the increase in the plant's maintenance costs. If inexpensive carbon steel components could be coated and lined with cost-effective high-hydrothermal temperature stable, anti-corrosion, -oxidation, and -fouling materials, this would improve the power plant's economic factors by engendering a considerable reduction in capital investment, and a decrease in the costs of operations and maintenance through optimized maintenance schedules.

  15. Using New Coating Materials for Corrosion Prevention of Reinforced Concrete

    Directory of Open Access Journals (Sweden)

    Elshami Ahmed

    2014-04-01

    Full Text Available Deterioration of reinforcing concrete structures is a common problem among all the Mediterranean countries. To protect steel from corrosion, cobalt oxide with zinc oxide were successfully deposited on silica and alumina layer according to Core–shell theory. This theory based on depositing a surface layer of expensive efficient anticorrosive coating on a cheap extender expressing the bulk. The combination of both core and shell compounds led to the production of new coating with improved properties different from each of its individual components. These improved properties lead to change in the efficiency of protection properties of coating films containing these new coating. The objective of the present work is to prepare a new ecologically friendly natural and inorganic coating of Egyptian mix (kaolin and ceramic waste and zinc phosphate as corrosion inhibitors based on the solid–solid interaction to protect steel from corrosion in buildings construction. The results revealed that these new coating gives the best results in protecting steel substrates from corrosion especial in aggressive environment.

  16. Microstructure and corrosion behavior of electroless deposited Ni-P/CeO2 coating

    Institute of Scientific and Technical Information of China (English)

    Hui Ming Jin; Shi Hang Jiang; Lin Nan Zhang

    2008-01-01

    Electroless Ni-P/nano-CeO2 composite coating was prepared in acidic condition,and its microstructure and corrosive property were compared with its CeO2-free counterpart.Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) spectrometer were used to examine surface morphology and structure of the as-plated coating.Differential scanning calorimeter (DSC) and transmission electronic microscopy (TEM) were used to study the coating's phase change at high temperature.The coating's corrosive behavior in 3%NaCI + 5%H2SO4 solution was also investigated.The results showed that Ni-P coating had partial amorphous structure mixed with nano-crystals,while the Ni-P/CeO2 coating had perfect amorphous structure.In high-temperature condition,Ni3P precipitation and Ni crystallization took place in both coatings but at different temperatures,while the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels.The anti-corrosion property was better in the CeO2-containing coating,and this was due to its less liability to undergo local-cell corrosion than its CeO2-free counterpart.Ni-P/CeO2 coating's pure amorphous structure was the result of Ni's hindered crystal-typed deposition and P's promoted deposition.

  17. 质量控制点在金塘大桥钢箱梁防腐涂装工程中的应用%The Application of Quality Control Point in Jintang Bridge Steel Box Beam of Anti-corrosion Engineering

    Institute of Scientific and Technical Information of China (English)

    李勇

    2012-01-01

    介绍了质量控制点设置的原则,在进行工序分析的基础上,成功运用质量控制点对金塘大桥钢箱梁电弧喷涂长效防腐项目进行质量控制,并取得显著成效.为防腐涂装施工企业有效运用质量控制点提高工程质量,提供了一定的借鉴.%The establishment principle of the quality control point was introduced, Base on the a-nalysis of working procedure,the quality control points were successfully applied on Jintang bridge steel box beam arc spray long-term anticorrosion project for quality control, and made significantly effectiveness. A reference was procided for coating of construction enterprises application quality control point to improve the project quality.

  18. Final Technical Report - Recovery Act: Organic Coatings as Encapsulants for Low Cost, High Performance PV Modules

    Energy Technology Data Exchange (ETDEWEB)

    Stuart Hellring; Jiping Shao; James Poole

    2011-12-05

    The objective of this project was to evaluate the feasibility of utilizing PPG's commercial organic coatings systems as efficient, modernized encapsulants for low cost, high performance, thin film photovoltaic modules. Our hypothesis was that the combination of an anticorrosive coating with a more traditional barrier topcoat would mitigate many electrochemical processes that are now responsible for the significant portion of photovoltaic (PV) failures, thereby nullifying the extremely high moisture barrier requirements of currently used encapsulation technology. Nine commercially available metal primer coatings and six commercially available top coatings were selected for screening. Twenty-one different primer/top coat combinations were evaluated. The primer coatings were shown to be the major contributor to corrosion inhibition, adhesion, and barrier properties. Two primer coatings and one top coating were downselected for testing on specially-fabricated test modules. The coated test modules passed initial current leakage and insulation testing. Damp Heat testing of control modules showed visible corrosion to the bus bar metal, whereas the coated modules showed none. One of the primer/top coat combinations retained solar power performance after Damp Heat testing despite showing some delamination at the EVA/solar cell interface. Thermal Cycling and Humidity Freeze testing resulted in only one test module retaining its power performance. Failure modes depended on the particular primer/top coating combination used. Overall, this study demonstrated that a relatively thin primer/top coating has the potential to replace the potting film and backsheet in crystalline silicon-based photovoltaic modules. Positive signals were received from commercially available coatings developed for applications having performance requirements different from those required for photovoltaic modules. It is likely that future work to redesign and customize these coatings would result in

  19. Investigation of anti-corrosive properties of poly(aniline-co-2-pyridylamine-co-2,3-xylidine) and its nanocomposite poly(aniline-co-2-pyridylamine-co-2,3-xylidine)/ZnO on mild steel in 0.1 M HCl

    Science.gov (United States)

    Alam, Ruman; Mobin, Mohammad; Aslam, Jeenat

    2016-04-01

    A soluble terpolymer of aniline (AN), 2-pyridylamine (PA) and 2,3-xylidine (XY), poly(AN-co-PA-co-XY) and its nanocomposite with ZnO nanoparticles namely, poly(AN-co-PA-co-XY)/ZnO were synthesized by chemical oxidative polymerization employing ammonium persulfate as an oxidant. Nanocomposites of homopolymers, polyaniline/ZnO, poly(XY)/ZnO and poly(PA)/ZnO were also synthesized by following similar synthesis route. FTIR, XRD and SEM techniques were used to characterize the synthesized compounds. The synthesized compounds were chemically deposited on mild steel specimens by solvent evaporation method using N-methyl-2-pyrrolidone (NMP) as solvent and 10% epoxy resin (by weight) as binder. Anticorrosive properties of homopolymer nanocomposites, terpolymer and its nanocomposite coatings were studied in 0.1 M HCl by subjecting them to various corrosion tests which includes: free corrosion potential measurement (OCP), weight loss measurements, potentiodynamic polarization, and AC impedance technique. The surface morphology of the corroded and uncorroded coated steel specimens was evaluated using SEM. The corrosion protection performance of terpolymer nanocomposite coating was compared to the terpolymer and individual homopolymers nanocomposites coatings after 30 days immersion in corrosive medium.

  20. Analysis on Application of Zinc Spraying Anti-corrosion Technology in Hydraulic Metal Structure%浅析喷锌防腐技术在水工金属结构上的应用

    Institute of Scientific and Technical Information of China (English)

    张玉安

    2013-01-01

      Zinc spraying anti-corrosion technology is an anti -corrosion method similar to hot dip galvanized anti -corrosion effect.Specific requirements are as follows : sand spraying anti-rust work should be done well on the surface of hydraulic metal, thereby metallic luster can be exposed from the metal surface , and the surface is roughened.Then, the lead wires are melted and blown to the surface of hydraulic metal through compressed air method , thereby forming a zinc coating layer . Pores are filled on this basis; finally a composite layer can be formed to prevent further erosion .%  喷锌防腐技术是一种类似于热浸锌防腐蚀效果的防腐蚀方法。具体要求在水工金属的表面做好喷砂除锈工作,使金属表面露出金属光泽并打毛,然后将铅丝融化,最后通过压缩空气的方法将其吹附到水工金属的表面,形成一个锌涂层,在此基础上填充完毛细孔,最后形成复合层来防止进一步的侵蚀。

  1. Action mechanism of antioxidation and anticorrosion and molecular design for perfluoropolyether fluid additives (I) --Action mechanism of additive and property of donating-accepting electron

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The combination energy and chemical adsorption energy of N-substituted perfluoropoly- alkyletherphenylamide (PFPEA) additive to perfluoropolyalkylether oxygen radical (RfO.) and to Fe atom have been calculated by quantum chemical methods. Structural characteristics, action mechanism, property of donating-accepting electron and substituent effect for antioxidant and anticorrosive additive are investigated. It is found that HOMO of the additives is a p-molecular orbital with lone pair electron of heteroatom. The HOMO of PFPEA additive reacts with LUMO of Fe atom to result in chemical adsorption. The LUMO of additive can interact with the SOMO of RfO. and accept electron of RfO. to form stable addition product. The additives have the property of donating-accepting electron. The electron-releasing group, particularly, the phenyl group, introduced to N atom of phenylamide can increase the combination energy and chemical adsorption energy, and enhance the antioxidant and anticorrosive efficiency. The research achievements can provide useful information for the designing of new antioxidant and anticorrosive additive. Based on the calculated results, antioxidant and anticorrosive efficiency can be predicted roughly as the following order: compounds III>II>I>IV>V.

  2. Action mechanism of antioxidation and anticorrosion andmolecular design for perfiuoropolyether fluid additives (Ⅱ)Synthesis and measurement of N-substituted perfluoropolyalkylether phenyla-mide

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Three kinds of the antioxidation and anticorrosion additives from the N-substituted per-fluoropolyalkylether phenylamide (PFPEA) were selected and synthesized. UV and IR spectralanalyses were carried out, and strong absorption peaks of UV from benzene ring are about 240.7,215.4 and 230.1 nm, respectively. The characteristic peaks of IR from the C==O are about 1713.9,1712.2 and 1710.8 cm-1, respectively. The antioxidant and anticorrosive property was tested forthe three synthesized additives. The results show that the weight loss of lubrication oil can de-crease by 1/7, 1/9 and 1/25 respectively after adding synthesized additives. The thermal decom-position temperature(TD) in the presence of Al2O3 can increase by 19-22℃. From theoretic andexperimental study it indicates that the PFPEAs with nitrogen heteroatom not only accepts electronfrom perfluoropolyalkylether oxygen radical (RfO.) to form a stable adduct and to prevent RfO. de-composing further, but also donates electron to form chemical adsorption film and to protect metalfrom corrosion. These additives have shown the better property of the antioxidation and anticorro-sion. An electron-releasing group, or phenyl group, introduced to the N-atom of this kind of com-pound can improve the antioxidant and anticorrosive efficiency of the additives.

  3. USE OF EXPERIMENTAL PLAN TO DEVELOPMENT OF PAINTS AND STICKERS ANTICORROSIVES

    Directory of Open Access Journals (Sweden)

    Danielly Vieira de Lucena

    2013-03-01

    Full Text Available The aim of this work is to study the influence of clay content and the number of layers “active” in the musical parameters and the degree of rust bubbles, using a experimental plan 22 type with three experiments in the central point. For this, polymer-clay nanocomposites obtained using montmorillonite (MMT, as the inorganic phase, and poly(methyl methacrylate (PMMA, as organic phase, for use as adhesives and coatings (paints and varnishes with high resistance to corrosion, to be applied on metal structures used in the petroleum industry. Measures of thickness and adhesion of films to demonstrate the effectiveness of the coating produced were also conducted. From the analysis of response surfaces show that the best corrosion characteristics are observed for acrylic coatings fortified with 5% organoclay layers and three “active”. This behavior is expected on account of the further enhancement provided by the high concentration of the components forming coating.

  4. ANTICORROSIVE ZINC COVERINGS ON STEEL ARTICLES: PROSPECTS OF THERMAL DIFFUSION COVERINGS

    Directory of Open Access Journals (Sweden)

    V. M. Konstantinov

    2013-01-01

    Full Text Available The analysis of existing zinc coatings on steel details is carried out. The reached results on development of energyresourcesaving technologies of thermal-diffusion galvanization are reported.

  5. The Research Situation and the Progress of Functional Waterborne Polyurethane Building Coatings%功能型水性聚氨酯建筑涂料的研究现状和最新进展∗

    Institute of Scientific and Technical Information of China (English)

    许凯翔; 杨建军

    2016-01-01

    综述了近几年功能型水性聚氨酯在建筑涂料中的应用现状和最新进展,主要包括防霉杀菌、防腐蚀、阻燃、防涂鸦、节能环保等特殊性能的水性聚氨酯功能型涂料;展望了功能型水性聚氨酯建筑涂料的发展前景。%The latest progress in functional waterborne polyurethane coatings in the field of building was intro⁃duced, including antimicrobial coatings, anticorrosive coatings, flame retardant coatings, anti⁃graffiti coatings and environment⁃friendly coatings, etc. The application prospect of waterborne polyurethane building coatings was pros⁃pected.

  6. 粘弹体防腐材料研制及其应用%Development and application of viscoelastic anti-corrosion materials

    Institute of Scientific and Technical Information of China (English)

    袁春; 李建忠; 王颖; 连艺秀; 刘艳利; 孙晶; 黄琳

    2012-01-01

    介绍了中国石油天然气管道科学研究院自主研制的粘弹体防腐材料的生产设备、技术参数以及工艺流程,并根据GB/T 4472-84、DIN 30670-91、SY/T 0414-2007、ISO21809-2008和GB/T23257-2009相关标准,对该材料70℃阴极剥离、120 d热水浸泡、23℃剥离强度、剪切强度、绝缘电阻率、密度、冲击强度、吸水率等性能进行了跟踪测试,结果表明:各项性能指标均符合相关标准要求.该材料在西气东输二线补口、阀室、站场等已广泛应用,具有良好的防腐性能,基本确保了西气东输二线管道的安全运行.%Production equipment, technical parameters and process of viscoelastic anti-corrosion materials developed independently by the Pipeline Research Institute of CNPC are described, and a tracking test is conducted for cathode disbonding at 70 °C, 120 d hot water soaking, peel strength at 23 °C, shear strength, insulation resistivity, density, impact strength, water absorption and other properties of the material in accordance with relevant standards such as GB/T4472-84, DIN30670-91, SY/T0414-2007, ISO21809-2008 and GB/T23257-2009. The results show that all performance indexes are in line with the relevant standards. The material with good corrosion resistance has been widely used in the field coating for welded joint, valve chambers and stations in the 2nd West-to-East Gas Pipeline, which basically ensure the safe operation of the Pipeline.

  7. Investigation on a Sol-gel Coating Containing Inhibitors on 2024-T3 Aluminum Alloy

    Institute of Scientific and Technical Information of China (English)

    SHI Hong-wei; LIU Fu-chun; HAN En-hou; SUN Ming-cheng

    2006-01-01

    For a long time, chromate incorporated conversion coatings have been drawn special attention in corrosion protection of aircraft-used aluminum alloys. However,ever-increasing environmental pressures requires that non-chromate conversion coatings be developed because of the detrimental carcinogenic effects of the chromate compounds. In recent years, the sol-gel coatings doped with inhibitors were developed to replace chromate conversion coatings, and showed real promise. A sol-gel coating was prepared and its anti-corrosion behavior was investigated using the potentiodynamic scanning (PDS) and the electrochemical impedance spectroscopy (EIS). It is found that the sol-gel coating obtained by the hydrolysis and condensation of 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetramethoxysilane (TMOS) is prone to form defects if cured at the room temperature, whereas if cured at a higher temperature (100 ℃), these flaws can be avoided. Furthermore, it can be seen that addition of anti-foam agents and surfactants will reduce the faults if cured at the room temperature. Effects of the corrosion inhibitors, CeCl3 and mercaptobenzothiazole (MBT), in the sol-gel coatings on 2024-T3 aluminum alloy were also investigated. Results show that the corrosion resistance of the sol-gel coatings containing CeCl3 proves to be better than that of the pure and MBT added sol-gel coatings by the electrochemical methods.

  8. Electrochemical and In Vitro Behavior of Nanostructure Sol-Gel Coated 316L Stainless Steel Incorporated with Rosemary Extract

    Science.gov (United States)

    Motalebi, Abolfazl; Nasr-Esfahani, Mojtaba

    2013-06-01

    The corrosion resistance of AISI 316L stainless steel for biomedical applications, was significantly enhanced by means of hybrid organic-inorganic sol-gel thin films deposited by spin-coating. Thin films of less than 100 nm with different hybrid characters were obtained by incorporating rosemary extract as green corrosion inhibitor. The morphology, composition, and adhesion of hybrid sol-gel coatings have been examined by SEM, EDX, and pull-off test, respectively. Addition of high additive concentrations (0.1%) did not disorganize the sol-gel network. Direct pull-off test recorded a mean coating-substrate bonding strength larger than 21.2 MPa for the hybrid sol-gel coating. The effect of rosemary extract, with various added concentrations from 0.012 to 0.1%, on the anticorrosion properties of sol-gel films have been characterized by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests in simulated body fluid (SBF) solution and has been compared to the bare metal. Rosemary extract additions (0.05%) have significantly increased the corrosion protection of the sol-gel thin film to higher than 90%. The in vitro bioactivity of prepared films indicates that hydroxyapatite nuclei can form and grow on the surface of the doped sol-gel thin films. The present study shows that due to their excellent anticorrosion properties, bioactivity and bonding strength to substrate, doped sol-gel thin films are practical hybrid films in biomedical applications.

  9. The enhancement of benzotriazole on epoxy functionalized silica sol-gel coating for copper protection

    Science.gov (United States)

    Peng, Shusen; Zhao, Wenjie; Li, He; Zeng, Zhixiang; Xue, Qunji; Wu, Xuedong

    2013-07-01

    The influence of the amount of benzotriazole (BTA) on the wetting and anticorrosion ability of the epoxy functionalized silica sol-gel (ESol) coating was studied by various complementary methods. IR results demonstrate that BTA reacted with ESol through a 1:1 addition reaction of Nsbnd H to epoxy group. The water contact angle of the ESol coating increases with an increase in the amount of BTA. SEM and adhesion tests reveal that BTA could improve the adhesion of ESol to copper surface. Moreover, the best protection was achieved when the amount of BTA equals to the molar number of epoxy group in the ESol coating according to the results of electrochemical measurements and salt spray test.

  10. ENVIRONMENTAL FRIENDLY ANODIZING ON AZ91D MAGNESIUM ALLOYS AND COATING CHARACTERISTICS

    Institute of Scientific and Technical Information of China (English)

    A. Saijo; M. Hino; M. Hiramatsu; T. Kanadani

    2005-01-01

    An environmental friendly anodizing treatment (Anomag) from a phosphate-based solution without heavy metals on AZ91D magnesium alloy was studied. The characteristics of the coatings,such as structure, composition and corrosion resistance were investigated. The effects of this anodizing treatment on the mechanical properties were examined. X-ray diffraction (XRD) analysis revealed that the structure of the coatings is amorphous or glassy. In salt spray tests coatings with an average thickness of 10μm had an anticorrosive performance of over 1000 hours. Fatigue tests revealed that anodizing onto AZ91D magnesium alloy does not affect the fatigue strength. These results demonstrate the utility of this anodizing treatment on magnesium alloy for application as a structural material, such as in the automotive field.

  11. Electrodeposition of high corrosion resistance Cu/Ni-P coating on AZ91D magnesium alloy

    Science.gov (United States)

    Zhang, Shan; Cao, Fahe; Chang, Linrong; Zheng, JunJun; Zhang, Zhao; Zhang, Jianqing; Cao, Chunan

    2011-08-01

    High corrosion resistance Cu/Ni-P coatings were electrodeposited on AZ91D magnesium alloy via suitable pretreatments, such as one-step acid pickling-activation, once zinc immersion and environment-friendly electroplated copper as the protective under-layer, which made Ni-P deposit on AZ91D Mg alloy in acid plating baths successfully. The pH value and current density for Ni-P electrodeposition were optimized to obtain high corrosion resistance. With increasing the phosphorous content of the Ni-P coatings, the deposits were found to gradually transform to amorphous structure and the corrosion resistance increased synchronously. The anticorrosion ability of AZ91D Mg alloy was greatly improved by the amorphous Ni-P deposits, which was investigated by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). The corrosion current density ( Icorr) of the coated Mg alloy substrate is about two orders of magnitude less than that of the uncoated.

  12. Corrosion behavior of Zn-Ni-Al2O3 composite coating

    Institute of Scientific and Technical Information of China (English)

    ZHENG Huanyu; AN Maozhong; LU Junfeng

    2006-01-01

    The corrosion behavior and anti-corrosion mechanism of the Zn-Ni-Al2O3 composite coating were investigated by SEM, EDS and XPS.The results indicate that the corrosion type of the Zn-Ni-Al2O3 coatings in neutral 5 wt.% NaCl solution is uniform corrosion.The presence of compact and uniformly dispersed nano alumina particles substantially inhibits the corrosion of Zn-Ni-Al2O3 composite coatings.In the initial corrosion stage, the corrosive products of Zn-Ni matrix form a compact ZnCl2·4Zn(OH)2 layer.With the development of corrosion, some nano alumina particles are embedded and form a Ni enrichment layer.In Ni enrichment layer, Ni presents as Ni and NiO.

  13. Fabrication of TiO2-strontium loaded CaSiO3/biopolymer coatings with enhanced biocompatibility and corrosion resistance by controlled release of minerals for improved orthopedic applications.

    Science.gov (United States)

    Raj, V; Raj, R Mohan; Sasireka, A; Priya, P

    2016-07-01

    Titanium dioxide (TiO2) arrays were fabricated on Ti alloy by anodization method. Synthesis of CaSiO3 (CS) and various concentrations (1X-5X) of Sr(2+) substitutions in CS coatings on TiO2 substrate was achieved through an electrophoretic deposition technique. Fast release of mineral ions from implant surface produce over dosage effect and it is a potential hazardous factor for osteoblasts. So, in order to prevent the fast release of minerals, biopolymer coating was applied above the composite coatings. The coatings were characterized by FTIR, XRD, FE-SEM and EDX techniques. The mechanical, anticorrosion, antimicrobial properties and biocompatibility of the coatings were evaluated. Studies on the mechanical properties indicate that the addition of Sr(2+) and biopolymer increase the hardness strength of the coatings. The metal ion release from the coatings was studied by ICP-AES. The electrochemical properties of the coatings were studied in Ringer's solution, in which CS-3X/Chi-PVP coating on TiO2 exhibits good anticorrosion property and high resistivity against Escherichia coli and Staphylococcus aureus compared to CS-3X coating on TiO2. In vitro cell experiments indicate that osteoblasts show good adhesion and high growth rates for CS-3X/Chi-PVP coated TiO2 substrate, indicating that the surface cytocompatibility of CS-3X/Chi-PVP coated TiO2 substrate is significantly improved by the controlled release of mineral ions. In conclusion, the surface modification of TiO2/CS-3X/Chi-PVP coated titanium is a potential candidate for implant coating.

  14. Electrophoretic deposition of ZnO/alginate and ZnO-bioactive glass/alginate composite coatings for antimicrobial applications

    Energy Technology Data Exchange (ETDEWEB)

    Cordero-Arias, L.; Cabanas-Polo, S.; Goudouri, O.M. [Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, D-91058 Erlangen (Germany); Misra, S.K. [Materials Science and Engineering, Indian Institute of Technology Gandhinagar, Ahmedabad 382424 (India); Gilabert, J. [Institute of Ceramics Materials (ITC), University Jaume I, Avenida Vicent SosBaynat, 12006 Castellon (Spain); Valsami-Jones, E. [School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom); Sanchez, E. [Institute of Ceramics Materials (ITC), University Jaume I, Avenida Vicent SosBaynat, 12006 Castellon (Spain); Virtanen, S. [Institute for Surface Science and Corrosion (LKO, WW4), Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen (Germany); Boccaccini, A.R., E-mail: aldo.boccaccini@ww.uni-erlangen.de [Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, D-91058 Erlangen (Germany)

    2015-10-01

    Two organic/inorganic composite coatings based on alginate, as organic matrix, and zinc oxide nanoparticles (n-ZnO) with and without bioactive glass (BG), as inorganic components, intended for biomedical applications, were developed by electrophoretic deposition (EPD). Different n-ZnO (1–10 g/L) and BG (1–1.5 g/L) contents were studied for a fixed alginate concentration (2 g/L). The presence of n-ZnO was confirmed to impart antibacterial properties to the coatings against gram-negative bacteria Escherichia coli, while the BG induced the formation of hydroxyapatite on coating surfaces thereby imparting bioactivity, making the coating suitable for bone replacement applications. Coating composition was analyzed by thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS) analyses. Scanning electron microscopy (SEM) was employed to study both the surface and the cross section morphology of the coatings. Polarization curves of the coated substrates made in cell culture media at 37 °C confirmed the corrosion protection function of the novel organic/inorganic composite coatings. - Highlights: • Organic–inorganic nanocomposite coatings fabricated by electrophoretic deposition • nZnO and bioactive glass containing alginate coatings exhibit antibacterial effect. • Bioactive character and anticorrosion function of coatings demonstrated.

  15. Bioinspired Composite Coating with Extreme Underwater Superoleophobicity and Good Stability for Wax Prevention in the Petroleum Industry.

    Science.gov (United States)

    Liang, Weitao; Zhu, Liqun; Li, Weiping; Yang, Xin; Xu, Chang; Liu, Huicong

    2015-10-13

    Wax deposition is a detrimental problem that happens during crude oil production and transportation, which greatly reduces transport efficiency and causes huge economic losses. To avoid wax deposition, a bioinspired composite coating with excellent wax prevention and anticorrosion properties is developed in this study. The prepared coating is composed of three films, including an electrodeposited Zn film for improving corrosion resistance, a phosphating film for constructing fish-scale morphology, and a silicon dioxide film modified by a simple spin-coating method for endowing the surface with superhydrophilicity. Good wax prevention performance has been investigated in a wax deposition test. The surface morphology, composition, wetting behaviors, and stability are systematically studied, and a wax prevention mechanism is proposed, which can be calculated from water film theory. This composite coating strategy which shows excellent properties in both wax prevention and stability is expected to be widely applied in the petroleum industry.

  16. Formation and structure of composite coating of HDA and micro-plasma oxidation on A3 steel

    Institute of Scientific and Technical Information of China (English)

    YU Sheng-xue; XIA Yuan; CHEN Ling; GUAN Yong-jun; YAO Mei

    2004-01-01

    Composite coatings were obtained on A3 steel by hot dipping aluminum(HDA) at 720 ℃ for 6 min and micro-plasma oxidation(MPO) in alkali electrolyte. The surface morphology, element distribution and interface structure of composite coatings were studied by means of XRD, SEM and EDS. The results show that the composite coatings obtained through HDA/MPO on A3 steel consist of four layers. From the surface to the substrate, the layer is loose Al2O3 ceramic, compact Al2O3 ceramic, Al and FeAl intermetallic compound layer in turn. The adhesions among all the layers are strengthened because the ceramic layer formed at the Al surface originally, FeAl intermetallic compound layer and substrate are combined in metallurgical form through mutual diffusion during HDA process.Initial experiment results disclose that the anti-corrosion performance and wear resistance of composite coating are obviously improved through HDA/MPO treatment.

  17. Effect of Synthesizing Temperature on Microstructure and Electrochemical Property of the Hydrothermal Conversion Coating on Mg-2Zn-0.5Mn-Ca-Ce Alloy

    Directory of Open Access Journals (Sweden)

    Guanghui Guo

    2016-02-01

    Full Text Available Mg(OH2 conversion coatings were formed on an Mg-2Zn-0.5Mn-Ca-Ce alloy via hydrothermal method at three different synthesizing temperatures (160, 170 and 180 °C. The effect of synthesizing temperature on microstructure and electrochemical property of the coatings were systematically studied. With increasing synthesizing temperature, the coating became thicker due to the faster reaction and deposition of Mg(OH2 on the α-Mg phase and secondary phases of the substrate Mg alloy. Internal micro-cracks were also generated in the higher-temperature synthesized coatings due to the increased shrinking stress, but the cross-cutting micro-cracks were suppressed. Benefiting from the improved barrier effect against penetration of corrosive medium, the higher-temperature synthesized thicker coating presented significantly enhanced electrochemical property and anti-corrosion efficiency in Hanks’ solution.

  18. 钢结构及网架长效防腐%LONG-LASTING ANTICORROSION OF STEEL STRUCTURE AND LATTICED FRAME

    Institute of Scientific and Technical Information of China (English)

    张炼

    2001-01-01

    首都机场四机位库的钢结构及网架,锦西炼化总厂大型电缆桥架,厦门工程机械厂网架等均采用喷射除锈、环氧彩色漆、氯化橡胶漆,防腐效果好,寿命长久。%The spray derusting, color epoxy Paint and chlorinated rubberpaint were used for the steel structure and latticed frame of the four-bay hangar for Capital Airport, the large cable bridge of Jinxi Lianhua Main Workshop and the latticed frame for Xiamen Engineering Machinery Plant, by which a long-lasting anticorrosion effectiveness has been obtained.

  19. Studies on rheological property of coating for handling container bottom%集装箱箱底涂料流变性能的研究

    Institute of Scientific and Technical Information of China (English)

    陈东初; 刘娅莉

    2001-01-01

    The purpose of this study was to improve the rheological propertyof thick anticorrosive coatings. Varied thixotropic agents with different weight percent were added in anticorrosive coating. It proved that thixotropic agent consists of 2 weight percent modified polyamide and 1 weight percent bentonite has the best result. Viscosities of the coating at different rate of shear were tested, and Casson equation between coating viscosity and rate of shear was derived. The results show that the addition of thixotropic agent improves the rheological property of coating for handling container bottom obviously.%为提高厚防腐涂层的流变性能,在涂料中加入不同种类及含量的触变剂,优选出最佳触变剂,即2%改性聚酰胺和1%膨润土。通过不同剪切速率下的涂料粘度的测量,推导出Casson公式。结果表明,触变剂的加入能满足集装箱底涂料对流变性的要求。

  20. Anticorrosion Performance of Carbon Steel in 55% LiBr Solution Containing PMA/SbBr3 Inhibitor

    Institute of Scientific and Technical Information of China (English)

    HU Xian-qi; LIANG Cheng-hao; HUANG Nai-bao

    2006-01-01

    The anticorrosion performance of carbon steel in 55% LiBr solution containing PMA/SbBr3 inhibitor was studied by weight-loss tests, electrochemical measurements and surface analysis. In 55%LiBr+PMA/SbBr3 solution, corrosion rates of carbon steel at 145 ℃, 175 ℃, 190 ℃ and 240 ℃ are 18.32 μm·a-1, 27.68 μm·a-1, 53.58 μm·a-1 and 73.78 μm·a-1, respectively. PMA/SbBr3 inhibitor may inhibit the corrosion of carbon steel in 55% LiBr solution effectively. Especially, it shows an excellent corrosion inhibition performance at high temperature. Both anodic and cathodic reactions of carbon steel may be inhibited by PMA/SbBr3 inhibitor, so it may be classified as mixed inhibitor. In 55%LiBr+PMA/SbBr3 solution, the apparent activation energy of the corrosion reaction of carbon steel is 29.61 kJ·mol-1. The corrosion inhibition mechanism of PMA/SbBr3 is suggested as follows: PMA has the effect of inhibiting hydrogen evolution and a strong oxidizing property; Sb3+ also exhibits oxidizing properties, and can exist stably with PMA in LiBr solutions; the passive film comprising Fe2O3 and antimony formed on carbon steel surface may prevent Br- from diffusing into the metal surface due to the synergistic effect of PMA and Sb3+; As a result, the anticorrosion performance of carbon steel may be improved by PMA/SbBr3 inhibitor in 55% LiBr solution.

  1. Characterization of steam generated anti-corrosive oxide films on Aluminium alloys

    DEFF Research Database (Denmark)

    Din, Rameez Ud; Jellesen, Morten Stendahl; Ambat, Rajan

    2014-01-01

    alloy surfaces were exposed to high pressure steam produced by an autoclave at a temperature of 107 – 121 °C and pressure of 15 -17 psi for 10 minutes to produce a thin coating of aluminium oxide. The aim of this study is to understand the effect of high pressure steam with and without different...

  2. Functional Coatings or Films for Hard-Tissue Applications

    Directory of Open Access Journals (Sweden)

    Guocheng Wang

    2010-07-01

    Full Text Available Metallic biomaterials like stainless steel, Co-based alloy, Ti and its alloys are widely used as artificial hip joints, bone plates and dental implants due to their excellent mechanical properties and endurance. However, there are some surface-originated problems associated with the metallic implants: corrosion and wear in biological environments resulting in ions release and formation of wear debris; poor implant fixation resulting from lack of osteoconductivity and osteoinductivity; implant-associated infections due to the bacterial adhesion and colonization at the implantation site. For overcoming these surface-originated problems, a variety of surface modification techniques have been used on metallic implants, including chemical treatments, physical methods and biological methods. This review surveys coatings that serve to provide properties of anti-corrosion and anti-wear, biocompatibility and bioactivity, and antibacterial activity.

  3. Effect of PEO-modes on the electrochemical and mechanical properties of coatings on MA8 magnesium alloy

    Science.gov (United States)

    Sidorova, M. V.; Sinebrukhov, S. L.; Khrisanfova, O. A.; Gnedenkov, S. V.

    Protective surface layers with a high corrosion stability and significant microhardness as compared to the substrate material were obtained on MA8 magnesium alloy by Plasma Electrolytic Oxidation (PEO) in a silicate-fluoride electrolyte. The phase and elemental composition of the coatings were investigated. It was found that the application of the bipolar PEO-modes enables one to synthesize on the alloy's surface a high-temperature phase of magnesium silicate, forsterite (Mg2SiO4) having a good anticorrosion and mechanical properties.

  4. An investigation of the biochemical properties of tetrazines as potential coating additives

    Energy Technology Data Exchange (ETDEWEB)

    Jaiswal, Swarna [School of Biological Sciences, Dublin Institute of Technology, Kevin Street, Dublin 8 (Ireland); Centre for Research in Engineering Surface Technology (CREST), FOCAS Institute, Dublin Institute of Technology, Dublin 8 (Ireland); Varma, P.C. Rajath [Centre for Research in Engineering Surface Technology (CREST), FOCAS Institute, Dublin Institute of Technology, Dublin 8 (Ireland); O' Neill, Luke [FOCAS Institute, Dublin Institute of Technology, Dublin 8 (Ireland); Duffy, Brendan, E-mail: brendan.duffy@dit.ie [Centre for Research in Engineering Surface Technology (CREST), FOCAS Institute, Dublin Institute of Technology, Dublin 8 (Ireland); McHale, Patrick [School of Biological Sciences, Dublin Institute of Technology, Kevin Street, Dublin 8 (Ireland)

    2013-05-01

    1,2,4,5-Tetrazine and its 3,6-disubstituted derivatives are currently used for a range of industrial and medical applications as they exhibit particular coordination chemistries, characterised by electron and charge transfer phenomena. The aim of the present work is to synthesise two tetrazine derivatives, namely 3,6-dihydrazino-1,2,4,5-tetrazine (DHDTZ) and 1,2,4,5-tetrazine dicarboxylic acid (DCTZ), and determine their antibacterial, antioxidant and anticorrosion characteristics as additives in a sol–gel coating on SS316L steel. The structure of the tetrazines was confirmed by NMR and FTIR while the surface morphology of bacterial cells in their presence was observed by AFM. Their ability to inhibit corrosion on 316L stainless steel was electrochemically determined using a potentiodynamic scanning (PDS) technique. The corrosion inhibition results showed that the acidic DCTZ provided the best corrosion protection. The concentration-dependent antioxidant capacity of the tetrazines was confirmed by both DPPH radical scavenging activity and FRAP assays, showing higher activity for DHDTZ than DCTZ. Furthermore, a DHDTZ doped sol–gel solution was prepared and curing parameter (temperature and time) was optimised for coating on microtitre wells and stainless steel panel. The antibacterial activity of the coated surfaces against Pseudomonas aeruginosa ATCC 27853 and the biofilm forming bacteria Staphylococcus epidermidis CSF 41498 was determined. DHDTZ showed significantly higher antibacterial activities with MIC as low as 31 ppm compared to 250 ppm for DCTZ. Highlights: ► Tetrazine derivatives showed strong antibacterial activity against bacterial pathogens. ► Electrochemical studies confirmed the anticorrosion property of the compounds. ► Significant antioxidant activity was exhibited by the compounds. ► Tetrazine doped sol–gel coating inhibited bacterial growth on 316L stainless steel. ► Tetrazine derivatives can be used as a potential hygiene coating

  5. Fabrication of durable fluorine-free superhydrophobic polyethersulfone (PES) composite coating enhanced by assembled MMT-SiO2 nanoparticles

    Science.gov (United States)

    Zhang, Xiguang; Wang, Huaiyuan; Liu, Zhanjian; Zhu, Yixing; Wu, Shiqi; Wang, Chijia; Zhu, Yanji

    2017-02-01

    A durable fluorine-free polyethersulfone (PES) superhydrophobic composite coating with excellent wear-resistant and anti-corrosion properties has been successfully fabricated by combining sol-gel and spray technology. The robust micro/nano-structures of the prepared surface were established by introducing binary montmorillonite-silica (MMT-SiO2) assembled composite particles, which were formed by in-situ growth of SiO2 on MMT surfaces via sol-gel. Combined with the low surface energy of amino silicon oil (APDMS), the fluorine-free superhydrophoic PES coating was obtained with high water contact angle 156.1 ± 1.1° and low sliding angle 4.8 ± 0.7°. The anti-wear of the final PES/APDMS/MMT-SiO2 superhydrophobic coating can reach up to 60,100 cycles, which is outdistancing the pure PES coating (6800 cycles) and the PES/MMT/SiO2 coating prepared by simple physical mixture (18,200 cycles). The enhanced wear resistance property can be mainly attributed to the lubrication performance of APDMS and stable interface bonding force between the MMT surface and SiO2. Simultaneously, potentiodynamic polarization curves and electrochemical impedance spectroscopy exhibited the outstanding anti-corrosion property of PES/APDMS/MMT-SiO2 composite coating, with low corrosion current (1.6 × 10-10 A/cm2) and high protection efficiency (99.999%) even after 30 d immersion process. These test results show that this durable superhydrophobic PES composite coating can be hopefully to provide the possibility of industrial application.

  6. A novel method to prepare superhydrophobic, UV resistance and anti-corrosion steel surface

    KAUST Repository

    Isimjan, Tayirjan T.

    2012-11-01

    Both TiO 2 and SiO 2 coated steel surfaces containing micro- and nanoscale binary structures with different surface roughness were successfully fabricated by means of a facile layer by layer deposition process followed by heat treatment. The resulting surfaces were modified by the low free energy chemical PTES (1H,1H,2H,2H-Perfluorodecyltriethoxysilane). The experimental results of wettability exhibit that such modified surfaces have a strong repulsive force to water droplets, their static contact angles exceed 165°, receding angle>160°, advanced angles>170° and slide angle<1°. The resulting surfaces not only exhibit superhydrophobic properties but also show strong UV resistance (after coating SiO 2 on top of TiO 2) and strong stability to various solvents including 0.01% HCl solution. © 2012 Elsevier B.V.

  7. Qualification of the system for thermal coating rehabilitation in situ of oil pipeline in operation; Qualificacao de sistema de reabilitacao in situ de revestimento termico para oleodutos

    Energy Technology Data Exchange (ETDEWEB)

    Koebsch, Andre; Correa, Anyr Rosa; Cabral, Glaucia Brazuna; Castanheiras Junior, Wilson Gil [PETROBRAS, Rio de Janeiro, RJ (Brazil); Oliver, Joao Hipolito de Lima; Pinto, Mucio Eduardo Amarante Costa [PETROBRAS Transporte S.A. (TRANSPETRO), Rio de Janeiro, RJ (Brazil)

    2005-07-01

    The transfer of some derived products of petroleum with high viscosity is accomplished with the same ones heated up. These buried pipelines are provided of Thermal Isolation System (TIS). Those TIS are composed with a polyurethane foam layer (PU) that is externally protected by polyethylene layer (PE). The acids production was generated by the deterioration of TIS. This associated with an absence of anticorrosive coating on the pipeline cause the corrosion with its thickness loss and consequently it's endangered. The rehabilitation of the existent TIS was done necessary to control this corrosive process, by reason of the Cathodic Protection System usually used in complement to the anticorrosive coating does not work on this TIS. A TIS rehabilitation process with the pipeline in operation was specified by PETROBRAS - ENGINEER and TRANSPETRO. It's qualified and was composed by two stages: Pre-qualification: tests in factory using pipes with original TIS and operating with hot water to 85 deg C. This stage was composed by the removal of original TIS, pipe surface preparation, application and tests on the anticorrosive coating, application and tests of the PU foam and application and tests of the PE casing. Qualification: stage composed by the application in field of the new TIS in a thousand meters of the pipeline OBATI-SP, operated by TRANSPETRO, and tests of the pipe assembly. This work presents the results of the Qualification for the rehabilitation of the thermal coating. It achieves the quality level demanded by PETROBRAS - Engineer and TRANSPETRO. (author)

  8. HYDROTHERMALLY SELF-ADVANCING HYBRID COATINGS FOR MITIGATING CORROSION OF CARBON STEEL.

    Energy Technology Data Exchange (ETDEWEB)

    SUGAMA, T.

    2006-11-22

    Hydrothermally self-advancing hybrid coatings were prepared by blending two starting materials, water-borne styrene acrylic latex (SAL) as the matrix and calcium aluminate cement (CAC) as the hydraulic filler, and then their usefulness was evaluated as the room temperature curable anti-corrosion coatings for carbon steel in CO{sub 2}-laden geothermal environments at 250 C. The following two major factors supported the self-improving mechanisms of the coating during its exposure in an autoclave: First was the formation of a high temperature stable polymer structure of Ca-complexed carboxylate groups containing SAL (Ca-CCG-SAL) due to hydrothermal reactions between SAL and CAC; second was the growth with continuing exposure time of crystalline calcite and boehmite phases coexisting with Ca-CCG-SAL. These two factors promoted the conversion of the porous microstructure in the non-autoclaved coating into a densified one after 7 days exposure. The densified microstructure not only considerably reduced the conductivity of corrosive ionic electrolytes through the coatings' layers, but also contributed to the excellent adherence of the coating to underlying steel' s surface that, in turn, retarded the cathodic oxygen reduction reaction at the corrosion site of steel. Such characteristics including the minimum uptake of corrosive electrolytes by the coating and the retardation of the cathodic corrosion reaction played an important role in inhibiting the corrosion of carbon steel in geothermal environments.

  9. Microstructure and properties of oxalate conversion coating on AZ91D magnesium alloy

    Institute of Scientific and Technical Information of China (English)

    JIANG Yong-feng; ZHOU Hai-tao; ZENG Su-min

    2009-01-01

    The oxalate coating formed on AZ91D magnesium alloy by chemical conversion treatment methods in oxalate salt solutions was investigated.The surface morphologies and chemical composition of coating were examined using scanning electron microscopy (SEM) equipped with energy dispersive analysis of X-ray (EDX).Electrochemical impedance spectroscopy (EIS),potentiodynamic polarization curves and salt spray tests were employed to evaluate corrosion protection of the coating to substrate in 5% NaCl solution.The mechanism of coating formations was also considered in details.The results indicate that a compact and dense surface morphology with fine particle clusters of the oxalate coating on magnesium alloy is presented,which mainly consists of oxide or/and organic of Mg,Al and Zn.And the anti-corrosion of the magnesium after oxalate conversion treatment is better than that of the magnesium substrate.The results of salt spray test for oxalate coating is evaluated as Grade 9 according to ASTM B117.The electric resistance of oxalate chemical conversion coating to substrate is below 0.1Ω.

  10. In Situ Synthesis and Characterization of Fe-Based Metallic Glass Coatings by Electrospark Deposition Technique

    Science.gov (United States)

    Burkov, Alexander A.; Pyachin, S. A.; Ermakov, M. A.; Syuy, A. V.

    2017-02-01

    Crystalline FeWMoCrBC electrode materials were prepared by conventional powder metallurgy. Metallic glass (MG) coatings were produced by electrospark deposition onto AISI 1035 steel in argon atmosphere. X-ray diffraction and scanning electron microscopy verified the amorphous structure of the as-deposited coatings. The coatings have a thickness of about 40 microns and a uniform structure. The results of dry sliding wear tests against high-speed steel demonstrated that Fe-based MG coatings had a lower friction coefficient and more than twice the wear resistance for 20 km sliding distance with respect to AISI 1035 steel. High-temperature oxidation treatment of the metal glass coatings at 1073 K in air for 12 h revealed that the oxidation resistance of the best coating was 36 times higher than that for bare AISI 1035 steel. These findings are expected to broaden the applications of electrospark Fe-based MG as highly protective and anticorrosive coatings for mild steel.

  11. 特种风力发电机组塔筒防腐方案研究%Study on anticorrosion scheme of special wind turbine tower

    Institute of Scientific and Technical Information of China (English)

    古雅琦; 王海龙; 杨怀宇

    2012-01-01

    高原和海洋的风能资源丰富,更能发挥大容量风力发电机组的优势,利用前景广阔.但高原和海上的自然环境恶劣,对风机承载部件——塔筒的防腐要求更为严格.针对在高原和海上运行的特种风机,分析了塔筒的腐蚀环境,研究了塔筒的防腐原理,提出了塔筒的具体防腐措施和防腐方案,为特种风机塔筒的防腐提供了参考.%Resourceful wind energy on the plateau and sea can give full play to the advantages of large wind turbine, but the environment on those places is harsh. Bearing the weight of wind turbine, the towers have more serious corrosion challenge. In view of the special wind turbines such as high altitude wind turbines and offshore wind turbines, the corrosion environment in which the wind turbines are working is analyzed, and the tower anticorrosion principle is studied. The specific anticorrosion measures and schemes of tower in the plateau and marine environment are developed, which provide reference to the anticorrosion of the special wind turbine tower.

  12. Multispectral Coatings

    Science.gov (United States)

    2010-01-01

    nanowires. 2.2 Project Objectives  This project used spin coating technology, new and commercial nanoparticle composites, and ODC’s patented...of this project. The spin coating method to deposit polymers has been widely studied and allows for simple, low cost depositions of thin films...Figure 5). Spin coating controls the layer thickness by balancing the centrifugal forces of a developing thin film to the viscous forces that increase

  13. High-Temperature Corrosion of Protective Coatings for Boiler Tubes in Thermal Power Plants

    Institute of Scientific and Technical Information of China (English)

    XU Lianyong; JING Hongyang; HUO Lixing

    2005-01-01

    High-temperature corrosion is a serious problem for the water-wall tubes of boilers used in thermal power plants. Oxidation, sulfidation and molten salt corrosion are main corrosion ways.Thereinto, the most severe corrosion occurs in molten salt corrosion environment. Materials rich in oxides formers, such as chromium and aluminum, are needed to resist corrosion in high-temperature and corrosive environment, but processability of such bulk alloys is very limited. High velocity electric arc spraying (HVAS) technology is adopted to produce coatings with high corrosion resistance. By comparison, NiCr (Ni-45Cr-4Ti) is recommended as a promising alloy coating for the water-wall tubes, which can even resist molten salt corrosion attack. In the study of corrosion mechanism, the modern material analysis methods, such as scanning electron microscopy (SEM), X-ray diffractometry (XRD) and energy dispersive spectrometry (EDS), are used. It is found that the corrosion resistances of NiCr and FeCrAI coatings are much better than that of 20g steel, that the NiCr coatings have the best anti-corrosion properties, and that the NiCr coatings have slightly lower pores than FeCrAI coatings.It is testified that corrosion resistance of coatings is mainly determined by chromium content, and the microstructure of a coating is as important as the chemical composition of the material. In addition, the fracture mechanisms of coatings in the cycle of heating and cooling are put forward. The difference of the thermal physical properties between coatings and base metals results in the thermal stress inside the coatings. Consequently, the coatings spall from the base metal.

  14. Morbus Coats

    Science.gov (United States)

    Förl, B.; Schmack, I.; Grossniklaus, H.E.; Rohrschneider, K.

    2010-01-01

    Der fortgeschrittene Morbus Coats stellt im Kleinkindalter eine der schwierigsten Differenzialdiagnosen zum Retinoblastom dar. Wir beschreiben die klinischen und histologischen Befunde zweier Jungen im Alter von 9 und 21 Monaten mit einseitiger Leukokorie. Trotz umfassender Diagnostik mittels Narkoseuntersuchung, MRT und Ultraschall konnte ein Retinoblastom nicht sicher ausgeschlossen werden, und es erfolgte eine Enukleation. Histologisch wurde die Diagnose eines Morbus Coats gesichert. Da eine differenzialdiagnostische Abgrenzung zwischen Morbus Coats und Retinoblastom schwierig sein kann, halten wir in zweifelhaften Fällen auch angesichts der eingeschränkten Visusprognose und potenzieller Sekundärkomplikationen beim fortgeschrittenen Morbus Coats eine Enukleation für indiziert. PMID:18299842

  15. The superior cycling performance of the hydrothermal synthesized carbon-coated ZnO as anode material for zinc-nickel secondary cells

    Science.gov (United States)

    Feng, Zhaobin; Yang, Zhanhong; Huang, Jianhang; Xie, Xiaoe; Zhang, Zheng

    2015-02-01

    Carbon-coated ZnO is synthesized by the hydrothermal method. The X-ray diffraction (XRD), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray analysis (EDX) tests indicate that carbon is uniformly coated on the surface of the ZnO particle. And the crystal form of ZnO isn't changed. The effects of carbon layer on the electrochemical performances of ZnO have also been investigated by the charge/discharge cycling test, cyclic voltammetry (CV), Tafel polarization curves and electrochemical impedance spectroscope (EIS) tests. The CV curves at different scan rates exhibit that carbon-coated ZnO has the superior reversibility at high scan rate. The charge/discharge cycling tests under different charge/discharge rates show, even if at high-rate, the cycling performance and specific discharge capacity of carbon-coated ZnO are also superior to that of bare ZnO. The Tafel polarization curves and electrochemical impedance spectroscope (EIS) verify that the carbon layer can improve the anti-corrosion and charge-transfer performances of ZnO. The different rate experiments indicate that, compared with the increase of the conductivity, the effect of carbon layer on improving the anti-corrosion performance of ZnO plays a more dominating role in improving the electrochemical performances of ZnO at low charge/discharge rate.

  16. 变电站接地装置的腐蚀机理及防腐措施研究%Research on Corrosion Mechanism and Anti-corrosion Measure for Grounding Deviee at Substations

    Institute of Scientific and Technical Information of China (English)

    欧洲华

    2009-01-01

    本文针对变电站接地装置的腐蚀问题,简单介绍了接地装置易发生腐蚀的部位和原因,分析了在土壤中发生化学腐蚀,电化学腐蚀、微生物腐蚀和杂散电流腐蚀的腐蚀机理,并对影响腐蚀速率的主要因素及相互关系作了说明.在此基础上,提出了如下防腐技术措施:采用耐蚀材料和金属镀层;使用导电防腐涂料;实施阴极保护;采用高效膨润土降阻防腐剂,以适应多种土壤腐蚀环境.%Aiming at the corrosion issues of grounding device used in substation,its corrosion position occurred frequently and corrosion reason are introduced briefly.Several types of corrosion mechanism are also analyzed,such as chemical corrosion,electrochemical corrosion,microbiological corrosion and stray current corrosion,when grounding device lie in soil and corrosion occurs.Furthermore,some main factors,which can influence on rate of corrosion,and their correlation are illustrated.On the basis of these analysis,several technology measures are put forward to avoid grounding device corrosion to fit many kinds of soil corrosion environment.They are:selecting corrosion resistant material and metal coating,employing anti-corrosive paint,carrying out cathodic protection and adopting high efficient bentonite resistance.

  17. Hydroxyapatite-coated magnesium implants with improved in vitro and in vivo biocorrosion, biocompatibility, and bone response.

    Science.gov (United States)

    Kim, Sae-Mi; Jo, Ji-Hoon; Lee, Sung-Mi; Kang, Min-Ho; Kim, Hyoun-Ee; Estrin, Yuri; Lee, Jong-Ho; Lee, Jung-Woo; Koh, Young-Hag

    2014-02-01

    Magnesium and its alloys are candidate materials for biodegradable implants; however, excessively rapid corrosion behavior restricts their practical uses in biological systems. For such applications, surface modification is essential, and the use of anticorrosion coatings is considered as a promising avenue. In this study, we coated Mg with hydroxyapatite (HA) in an aqueous solution containing calcium and phosphate sources to improve its in vitro and in vivo biocorrosion resistance, biocompatibility and bone response. A layer of needle-shaped HA crystals was created uniformly on the Mg substrate even when the Mg sample had a complex shape of a screw. In addition, a dense HA-stratum between this layer and the Mg substrate was formed. This HA-coating layer remarkably reduced the corrosion rate of the Mg tested in a simulated body fluid. Moreover, the biological response, including cell attachment, proliferation and differentiation, of the HA-coated samples was enhanced considerably compared to samples without a coating layer. The preliminary in vivo experiments also showed that the biocorrosion of the Mg implant was significantly retarded by HA coating, which resulted in good mechanical stability. In addition, in the case of the HA-coated implants, biodegradation was mitigated, particularly over the first 6 weeks of implantation. This considerably promoted bone growth at the interface between the implant and bone. These results confirmed that HA-coated Mg is a promising material for biomedical implant applications.

  18. Zn-Al-Mg-RE涂层与有机涂层协同性的研究%Synergy effect between Zn-Al-Mg-RE coating and organic coatings

    Institute of Scientific and Technical Information of China (English)

    付东兴; 徐滨士; 张晓囡; 杨中元

    2009-01-01

    A set of anticorrosion organic coatings was applied on a Zn-Al-Mg-RE coating forming a new long term anti-corrosion multi-layer coating,and the metallic coating was prepared by high velocity arc spraying technology(HVAS).The organic coatings were also applied on a HVAF Al coating and Q235 steel substrate.After the coatings were immersed in 5wt% NaCl solution for 212 days at room temperature,the microstructure of corrosion products in micro-pores were observed with SEM.During micro-pores appearing,the synergy effect between the metallic coatings and the organic coatings in corrosive environment was investigated by EIS.The results indicate that the microstructure of corrosion products in the micro-pores of the Zn-Al-Mg-RE coating system is compacted.The Zn-Al-Mg-RE coating has the best synergy effect with the organic coatings.%采用高速电弧喷涂技术在Q235钢表面制备Zn-Al-Mg-RE涂层后涂装海洋防腐有机涂层,构建一种新型的长效防腐复合涂层.同时,在Q235钢基体和高速电弧喷涂Al涂层表面涂装该有机涂层作为对比试样,观察了在5wt%NaCl溶液中常温浸泡212天后各体系微观孔隙处腐蚀产物的微观结构,用电化学交流阻抗谱技术研究了微观孔隙形成过程中金属涂层与有机涂层之间的协同性.结果表明,Zn-Al-Mg-RE涂层体系微观孔隙中形成的腐蚀产物微观结构致密;Zn-Al-Mg-RE涂层与该有机涂层具有最好的协同性.

  19. 遗体防腐处理方法%The Methods for Mortal Remains Anti-corrosion

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

      为了促进医学教学与遗体器官捐献事业发展,我国已经在中国红十字会的引领下开展遗体捐献与接收工作。本文叙述遗体接收利用单位对遗体的防腐处理方法,在处理过程中可能遇到的问题与处理方式。期待更多医疗卫生相关单位掌握防腐处理技术,促进我国遗体捐献工作。%In order to promote the development of medical teach-ing and organ donation of the body, we have carried out under the lead of the Red Cross Society of China remains donation and re-ceipt of work. This article describes receiving unit for anticorro-sion treatment of the remains of the body, and may encounter problems during the process and approach. Looking forward to more access to preservative treatment technology of medical and health, promoting body donation in China.

  20. REACH exposure assessment of anticorrosive paint products--determination of exposure from application and service life to the aquatic environment.

    Science.gov (United States)

    Gade, Anne Lill; Heiaas, Harald; Thomas, Kevin; Hylland, Ketil

    2011-12-01

    The European Community Regulation on the registration, evaluation, authorisation and restriction of chemicals (REACH) introduced exposure scenarios describing safe use quantitatively, and enhancing the importance of scientific based exposure assessments. This paper presents methods to determine exposure from the airless spray application of anti-corrosive paint and leaching of painted articles submerged in seawater, to establish whether it is possible to test these exposures in a reproducible and feasible way. The paper also presents results from using the methods in order to assess how well the default values recommended under REACH coincide with the tested values and corresponding values available in literature. The methods used were feasible under laboratory conditions. The reproducibility of the application study was shown to be good and all analyses of the leaching showed concentrations below detection limit. More replicates will be required to validate the reproducibility of the growth inhibition tests. Measured values for the present overspray scenario were between, and the leaching values below, values from REACH guidelines and emission scenario documents. Further development of the methods is recommended.

  1. Antibacterial characteristics of electroless plating Ni-P-TiO2 coatings

    Science.gov (United States)

    Zhao, Qi; Liu, Chen; Su, Xueju; Zhang, Shuai; Song, Wei; Wang, Su; Ning, Guiling; Ye, Junwei; Lin, Yuan; Gong, Weitao

    2013-06-01

    Electroless Ni-P coatings have been widely used in the chemical, mechanical and electronic industries due to their excellent corrosion and wear resistance. Many studies reported that the incorporation of nano-sized particles TiO2 into Ni-P matrix greatly improved their anti-corrosion and anti-wear resistance. However no studies have been reported on their anti-bacterial property. In this paper, the Ni-P-TiO2 nano-composite coatings were prepared on stainless steel 316L using electroless plating technique. The experimental results showed that the Ni-P-TiO2 coatings reduced the adhesion of three bacterial strains (Pseudomonas fluorescens, Cobetia and Vibrio) by up to 75% and 70% respectively, as compared with stainless steel and Ni-P coatings. The electron donor surface energy of the Ni-P-TiO2 coatings increased significantly with increasing TiO2 content after UV irradiation. The number of adhered bacteria decreased with increasing electron donor surface energy of the coatings.

  2. Antibacterial characteristics of electroless plating Ni–P–TiO{sub 2} coatings

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, Qi, E-mail: Q.Zhao@dundee.ac.uk [Department of Mechanical Engineering, University of Dundee, DD1 4HN (United Kingdom); Liu, Chen; Su, Xueju; Zhang, Shuai; Song, Wei; Wang, Su [Department of Mechanical Engineering, University of Dundee, DD1 4HN (United Kingdom); Ning, Guiling, E-mail: ninggl@dlut.edu.cn [State Key Laboratory of Fine Chemicals and School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024 (China); Ye, Junwei; Lin, Yuan; Gong, Weitao [State Key Laboratory of Fine Chemicals and School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024 (China)

    2013-06-01

    Electroless Ni–P coatings have been widely used in the chemical, mechanical and electronic industries due to their excellent corrosion and wear resistance. Many studies reported that the incorporation of nano-sized particles TiO{sub 2} into Ni–P matrix greatly improved their anti-corrosion and anti-wear resistance. However no studies have been reported on their anti-bacterial property. In this paper, the Ni–P–TiO{sub 2} nano-composite coatings were prepared on stainless steel 316L using electroless plating technique. The experimental results showed that the Ni–P–TiO{sub 2} coatings reduced the adhesion of three bacterial strains (Pseudomonas fluorescens, Cobetia and Vibrio) by up to 75% and 70% respectively, as compared with stainless steel and Ni–P coatings. The electron donor surface energy of the Ni–P–TiO{sub 2} coatings increased significantly with increasing TiO{sub 2} content after UV irradiation. The number of adhered bacteria decreased with increasing electron donor surface energy of the coatings.

  3. Facile approach in the development of icephobic hierarchically textured coatings as corrosion barrier

    Energy Technology Data Exchange (ETDEWEB)

    Momen, G., E-mail: gmomen@uqac.ca; Farzaneh, M.

    2014-04-01

    Highlights: • A superhydrophobic coating is developed via a simple environmental-friendly method. • This coating can be used on the surface of various metals such as copper, magnesium. • The superhydrophobic aluminum surface showed the excellent corrosion resistance. • The fabricated surface revealed a drastically reduction of ice adhesion strength. • Such surfaces can advantageously be used in cold climate regions. - Abstract: An anti-corrosion superhydrophobic film with water contact angle greater than 160° on aluminum alloy 6061 substrate was fabricated simply through the spin-coating method applied to Al{sub 2}O{sub 3} nanoparticles doped in silicone rubber solution. The as-obtained sample was characterized by scanning electron microscopy (SEM) and water contact angle/surface energy measurement. The corrosion behaviour of such coating in the NaCl solutions was investigated using the potentiodynamic polarization. The results show that the corrosion resistance of the developed superhydrophobic surface is improved greatly due to the composite wetting states or interfaces with numerous air pockets between its surface and the NaCl solution. This superhydrophobic coating could serve as an effective barrier against aggressive medium. Ice adhesion strength of the as-prepared superhydrophobic coating was also evaluated by measuring its ice adhesion force which was found to have reduced by 4.8 times compared to that of aluminum substrate as reference test.

  4. Sputtered solar absorber coatings with high-spectral selectivity and good durability

    Science.gov (United States)

    Graf, Wolfgang; Brucker, Franz; Koehl, Michael; Troescher, Thomas; Wittwer, Volker; Blessing, Rolf; Herlitze, Lothar

    1995-08-01

    Sputtering is a well established coating technology for glass panes. This technology is also interesting for the production of selective solar absorber coatings because the environmental impact is much less than for electroplating. There are already several sputtered absorber coatings for evacuated tubular collectors existing on the market. The application in ventilated collectors requires better durability of the absorbers and a technology which can be applied to planar substrates. The coatings presented here are produced by dc-magnetron sputtering. The maximum sample size was 2 m multiplied by 3 m. A thermal emittance (at 373 K) below 5% was achieved together with a solar absorptance (AM 1.5) above 90%. The coating is deposited directly onto copper sheets without the commonly used anti-corrosion nickel coating in between. The durability of the absorbers was found to be sufficient for the application in ventilated flat-plate collectors containing moisture according to the tests and requirements proposed by Task X of the Solar Heating and Cooling Programme of the International Energy Agency.

  5. Facile preparation of superamphiphobic epoxy resin/modified poly(vinylidene fluoride)/fluorinated ethylene propylene composite coating with corrosion/wear-resistance

    Science.gov (United States)

    Wang, Huaiyuan; Liu, Zhanjian; Wang, Enqun; Zhang, Xiguang; Yuan, Ruixia; Wu, Shiqi; Zhu, Yanji

    2015-12-01

    A robust superamphiphobic epoxy resin (EP)/modified poly(vinylidene fluoride) (MPVDF)/fluorinated ethylene propylene (FEP) composite coating has been prepared through the combination of chemical modification and spraying technique. Nanometer silica (SiO2, 2.5 wt.%) and carbon nanotubes (CNTs, 2.5 wt.%) were added in the coating to construct the necessary reticulate papillae structures for superamphiphobic surface. The prepared EP composite coating demonstrated high static contact angles (166°, 155°) and low sliding angles (3°, 5°) to water and glycerol, respectively. Moreover, the prepared coating can also retain superhydrophobicity under strongly acidic and alkaline conditions. The brittleness of EP can be avoided by introducing the malleable MPVDF. The wear life of the EP composite coating with 25 wt.% FEP was improved to 18 times of the pure EP coating. The increased wear life of the coating can be attributed to the designed nano/micro structures, the self-lubrication of FEP and the chemical reaction between EP and MPVDF. The anti-corrosion performance of the coatings was investigated in 3.5% NaCl solution using potentiodynamic polarization. The results showed that the prepared superamphiphobic composite coating was most effective in corrosion resistance, primarily due to the barrier effect for the diffusion of O2 and H2O molecules. It is believed that this robust superamphiphobic EP/MPVDF/FEP composite coating prepared by the facile spray method can pave a way for the large-scale application in pipeline transport.

  6. Effect of rare element cerium on the morphology and corrosion resistance of electro-less Ni-P coatings

    Directory of Open Access Journals (Sweden)

    Fu Chuan-qi

    2015-01-01

    Full Text Available This paper reports an experimental study on the microstructure and corrosion resistance of electro-less Ni-P coatings with increasing content of the rare element cerium (Ce. Surface morphology and the composition of the electro-less Ni-P coatings were studied by scanning electron microscope (SEM, X-ray energy dispersed analysis (EDS and X-ray diffraction analysis (XRD. Hardness and Adhesive force are researched by a HX-200 Vickers diamond indenter micro-hardness tester. Furthermore, we study the adhesive force by using the Revetest scratch tester. We get the possession of Ce amorphous Ni-P coatings which has excellent properties in anti-corrosion. The effect of the rare element cerium concentration on corrosion resistance of the coatings was evaluated in the groundwater immersion test and porosity test, respectively. The results indicated that added little the rare element cerium into the plating bath increased the phosphorus content of the coatings, decreased the corrosion rates, it also decreases the porosity of the amorphous Ni-P coatings. The lowest corrosion rates of the amorphous Ni-P coatings in groundwater immersion test is 4.1 um · h-1, at the rare element cerium concentration of 0.12g · L-1.

  7. The improvement of corrosion resistance of fluoropolymer coatings by SiO2/poly(styrene-co-butyl acrylate) nanocomposite particles

    Science.gov (United States)

    Chen, L.; Song, R. G.; Li, X. W.; Guo, Y. Q.; Wang, C.; Jiang, Y.

    2015-10-01

    The effects of nano-silica particles on the anticorrosion properties of fluoropolymer coatings on mild steel have been investigated in this paper. In order to enhance the dispersibility of nano-silica in fluoropolymer coatings, we treated the surface of nano-silica with poly(styrene-co-butyl acrylate) (P(St-BA)). The surface grafting of P(St-BA) on the nanoparticles were detected using Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric analyzer (TGA), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The surface of nanocomposite coatings and the coating-substrates bond texture were detected by FE-SEM. We also used energy-dispersive X-ray spectroscopy (EDS) to analyze whether the nanocomposite particles were added into the fluoropolymer coatings. In addition, the influences of various nanoparticles on the corrosion resistance of fluoropolymer-coated steel were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results shown that nanocomposite particles can be dispersed better in fluoropolymer coatings, and the electrochemical results clearly shown the improvement of the protective properties of the nanocomposite coatings when 4 wt.% SiO2/P(St-BA) was added to the fluoropolymer coatings.

  8. 大型天线防腐技术%Anticorrosion technology for large antenna

    Institute of Scientific and Technical Information of China (English)

    董长胜; 张伟明; 王建宅; 银秋华; 黄晓群; 任兵锐; 张亚林; 曹江涛

    2014-01-01

    Large Antennas have been widely used in the aerospace ,deep‐space exploration and broadcast ,w hich are essential in the communication .T hey are fabricated by metal ,w hich can be easily corroded .Corrosion will deteriorate the appearance and performance ,even cause the security problem .By analyzing the necessary ,theory and influence factors of antenna corro‐sion ,many methods are proposed ,w hich contains optimizing materials ,structures ,designs , coatings ,and transportation .%大型天线广泛地应用在航空航天、深空探测、广播通信等领域,成为信息传递必不可少的设备。其多采用金属材料制造,因此在长期的室外工作环境下,极易发生腐蚀。金属材料的腐蚀将严重影响天线的性能和外观,甚至会产生人员与设备的安全问题。本文结合实际情况通过分析天线腐蚀的必要性、腐蚀机理和影响因素,结合实际情况为天线的防腐提供了优化材料、结构、加工工艺设计、喷镀金属涂层防护、涂料涂装防护、运输安装过程的防护、已损坏防护层的修复等方法,实现天线的长效防腐。

  9. Preparation and Investigation Performance of Water- Based Epoxy Coating Containing Supercritical CO2 Synthesized SelfDoped Polyaniline-Expanded Graphite Nanohybrids As A Anti Corrosion Pigment

    Directory of Open Access Journals (Sweden)

    M.R.Baghezadeh

    2017-03-01

    Full Text Available In this research, self- doped polyaniline- expanded graphite nanohybrid (SPEG was synthesized by supercritical CO2 method and the anti-corrosion performance of SPEG in water- based epoxy coatings was considered. For this purpose, SPEG was introduced into water- based hardener and epoxy resin, separately via direct mixing under an ultrasonic homogenizer. The distribution of SPEG in both matrices was studied by zeta sizer, XRD and TEM characterization methods. The corrosion behavior of coatings was characterized salt spray and electrochemical impedance spectroscopy (EIS in 3.5 % NaCl solution. The results showed that coatings prepared by using SPEG in water-based hardener had the best corrosion resistance.

  10. Colonization of Bacteria on the Surfaces of Cold-Sprayed Copper Coatings Alters Their Electrochemical Behaviors

    Science.gov (United States)

    Suo, Xinkun; Abdoli, Leila; Liu, Yi; Xia, Peng; Yang, Guanjun; Li, Hua

    2017-02-01

    Copper coatings were fabricated on stainless steel plates by cold spraying. Attachment and colonization of Bacillus sp. on their surfaces in artificial seawater were characterized, and their effects on anticorrosion performances of the coatings were examined. Attached bacteria were observed using field emission scanning electron microscopy. Electrochemical behaviors including potentiodynamic polarization and electrochemical impedance spectroscopy with/without bacterial attachment were evaluated using commercial electrochemical analysis station Modulab. Results show that Bacillus sp. opt to settle on low-lying spots of the coating surfaces in early stage, followed by recruitment and attachment of extracellular polymeric substances (EPS) secreted through metabolism of Bacillus sp. The bacteria survive with the protection of EPS. An attachment model is proposed to illustrate the bacterial behaviors on the surfaces of the coatings. Electrochemical data show that current density under Bacillus sp. environment decreases compared to that without the bacteria. Charge-transfer resistance increases markedly in bacteria-containing seawater, suggesting that corrosion resistance increases and corrosion rate decreases. The influencing mechanism of bacteria settlement on corrosion resistance of the cold-sprayed copper coatings was discussed and elucidated.

  11. TiO2 nanotubes and mesoporous silica as containers in self-healing epoxy coatings

    Science.gov (United States)

    Vijayan P., Poornima; Al-Maadeed, Mariam Ali S. A.

    2016-12-01

    The potential of inorganic nanomaterials as reservoirs for healing agents is presented here. Mesoporous silica (SBA-15) and TiO2 nanotubes (TNTs) were synthesized. Both epoxy-encapsulated TiO2 nanotubes and amine-immobilized mesoporous silica were incorporated into epoxy and subsequently coated on a carbon steel substrate. The encapsulated TiO2 nanotubes was quantitatively estimated using a ‘dead pore ratio’ calculation. The morphology of the composite coating was studied in detail using transmission electron microscopic (TEM) analysis. The self-healing ability of the coating was monitored using electrochemical impedance spectroscopy (EIS); the coating recovered 57% of its anticorrosive property in 5 days. The self-healing of the scratch on the coating was monitored using Scanning Electron Microscopy (SEM). The results confirmed that the epoxy pre-polymer was slowly released into the crack. The released epoxy pre-polymer came into contact with the amine immobilized in mesoporous silica and cross-linked to heal the scratch.

  12. Fabrication and characterization of Ni–Zr composite coatings using electrodepositing technique

    Energy Technology Data Exchange (ETDEWEB)

    Cai, Fei [School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240 (China); Jiang, Chuanhai, E-mail: chuanhaijiang1963@163.com [School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240 (China); Zhang, Zhongquan [School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240 (China); Muttini, Enzo [ICMMO/LEMHE, UMR 8182, Université Paris-Sud 11, Orsay Cedex 91405 (France); Fu, Peng; Zhao, Yuantao [School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240 (China); Ji, Vincent [ICMMO/LEMHE, UMR 8182, Université Paris-Sud 11, Orsay Cedex 91405 (France)

    2015-06-25

    Highlights: • A novel Ni–Zr coatings with higher Zr content were fabricated. • Increasing Zr content resulted in the (1 1 1) preferred orientation. • The (1 1 1) preferred orientation increased the corrosion resistance. • Relationship between corrosion and Zr content, grain and texture was discussed. - Abstract: The main goal of this research is to prepare Ni–Zr composite coatings with different amounts of Zr micro-particles by using electrodeposition technology. Different characterization techniques including X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM) and Energy Dispersive X-ray Spectroscopy (EDX) were used to investigate the effects of Zr micro-particle contents on the surface morphology, texture, grain size, residual stress and hardness of the Ni–Zr composite coatings. The electrochemical impedance and potentiodynamic polarization measurements were also used to examine the corrosion resistance. As the Zr contents in the Ni–Zr composite coating increased, the (2 0 0) texture changed to the (1 1 1) texture, the grain size decreased, the residual stress and hardness increased. The anti-corrosion properties of the Ni–Zr composite coatings could be linked to several reasons such as the amount of Zr micro-particles in the deposits, a decrease in grain size, and a change in the texture of the deposits.

  13. Protective Coatings

    Science.gov (United States)

    1980-01-01

    General Magnaplate Corporation's pharmaceutical machine is used in the industry for high speed pressing of pills and capsules. Machine is automatic system for molding glycerine suppositories. These machines are typical of many types of drug production and packaging equipment whose metal parts are treated with space spinoff coatings that promote general machine efficiency and contribute to compliance with stringent federal sanitation codes for pharmaceutical manufacture. Collectively known as "synergistic" coatings, these dry lubricants are bonded to a variety of metals to form an extremely hard slippery surface with long lasting self lubrication. The coatings offer multiple advantages; they cannot chip, peel or be rubbed off. They protect machine parts from corrosion and wear longer, lowering maintenance cost and reduce undesired heat caused by power-robbing friction.

  14. Graphene Coatings

    DEFF Research Database (Denmark)

    Stoot, Adam Carsten; Camilli, Luca; Bøggild, Peter

    2014-01-01

    Owing to its remarkable electrical and mechanical properties, graphene has been attracting tremendous interest in materials science. In particular, its chemical stability and impermeability make it a promising protective membrane. However, recent investigations reveal that single layer graphene...... cannot be used as a barrier in the long run, due to galvanic corrosion phenomena arising when oxygen or water penetrate through graphene cracks or domain boundaries. Here, we overcome this issue by using a multilayered (ML) graphene coating. Our lab- as well as industrial-scale tests demonstrate that ML...... that graphene can still be a relevant candidate for thin coatings....

  15. Discussion on processing and anti-corrosion of high -acid crudes%高酸原油的加工及防腐工艺的探讨

    Institute of Scientific and Technical Information of China (English)

    梁金强; 王延臻; 贾远远; 徐学飞

    2011-01-01

    随着原油的深度开采,高酸值原油的产量逐年增加.高酸原油在加工过程中对炼油设备造成极其严重的腐蚀,影响了炼油装置的安全长周期运转,防腐就显得尤为重要了.综合叙述了原油中的腐蚀介质、腐蚀作用及影响腐蚀的因素,最后从工艺、材料和外加添加剂等方面提出了防护措施.%With the depth of oil exploration, the crude oil production of high acid value increases year by year. Very serious corrosion to the processing equipments are caused by high-acid crude oil during the course of processing, the anticorrosion becomes more and more important. Corrosive medium in crude oil, corrosive action and all kinds of corrosion factors are expounded comprehensively. Various anticorrosion measures are proposed from the process route, material, and additives.

  16. [Volume chemistry-ultraviolet spectrum differential method for determining the oxygen content in anti-corrosion copper powder with surface film consisting of benzotriazole].

    Science.gov (United States)

    Zhang, Tai-ming; Ding, Feng; Liang, Yi-zeng

    2006-11-01

    A method for determining the oxygen content in anti-corrosion copper powder with benzotriazole inhibitor surface film was established and the ultraviolet spectra of benzotriazole under various conditions were studied. The maximum absorption was at lamdamax=273 nm, and the temperature did not influence the absorption intensity at normal temperature. The linear range of concentration was 0-2.2 microg x mL(-1), the detection limit was 0.02 microg x mL(-1), and the apparent molar absorptivity of benzotriazole was epsilon = 5.41 x 10(4) L x mol(-1) x cm(-1) at 273 nm. Because the anti-corrosion copper powder consisted of copper metal, copper oxide and benzotriazole protecting film, the Cu and BTA contents of the powder were determined through EDTA titration and ultraviolet spectrophotometry, respectively, after the samples were decomposed with HCl and H2O2, and the oxygen content of the powder was calculated by differential method. The instruments are simple, the method is economical, and the manipulation is convenient. The standard deviation is 1.7%, and the differentiation coefficient is 7.6%. In conjunction with the application of the national standard method, the oxygen contents before and after the formation of the protecting film of the electrolyte copper powder were comparatively analyzed with satisfactory results.

  17. Porous tantalum coatings prepared by vacuum plasma spraying enhance bmscs osteogenic differentiation and bone regeneration in vitro and in vivo.

    Directory of Open Access Journals (Sweden)

    Ze Tang

    Full Text Available Tantalum, as a potential metallic implant biomaterial, is attracting more and more attention because of its excellent anticorrosion and biocompatibility. However, its significantly high elastic modulus and large mechanical incompatibility with bone tissue make it unsuitable for load-bearing implants. In this study, porous tantalum coatings were first successfully fabricated on titanium substrates by vacuum plasma spraying (VPS, which would exert the excellent biocompatibility of tantalum and alleviate the elastic modulus of tantalum for bone tissue. We evaluated cytocompatibility and osteogenesis activity of the porous tantalum coatings using human bone marrow stromal cells (hBMSCs and its ability to repair rabbit femur bone defects. The morphology and actin cytoskeletons of hBMSCs were observed via electron microscopy and confocal, and the cell viability, proliferation and osteogenic differentiation potential of hBMSCs were examined quantitatively by PrestoBlue assay, Ki67 immunofluorescence assay, real-time PCR technology and ALP staining. For in vivo detection, the repaired femur were evaluated by histomorphology and double fluorescence labeling 3 months postoperation. Porous tantalum coating surfaces promoted hBMSCs adhesion, proliferation, osteogenesis activity and had better osseointegration and faster new bone formation rate than titanium coating control. Our observation suggested that the porous tantalum coatings had good biocompatibility and could enhance osseoinductivity in vitro and promote new bone formation in vivo. The porous tantalum coatings prepared by VPS is a promising strategy for bone regeneration.

  18. Study on cerium-doped nano-TiO2 coatings for corrosion protection of 316 L stainless steel

    Science.gov (United States)

    Li, Suning; Wang, Qian; Chen, Tao; Zhou, Zhihua; Wang, Ying; Fu, Jiajun

    2012-04-01

    Many methods have been reported on improving the photogenerated cathodic protection of nano-TiO2 coatings for metals. In this work, nano-TiO2 coatings doped with cerium nitrate have been developed by sol-gel method for corrosion protection of 316 L stainless steel. Surface morphology, structure, and properties of the prepared coatings were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The corrosion protection performance of the prepared coatings was evaluated in 3 wt% NaCl solution by using electrochemical techniques in the presence and absence of simulated sunlight illumination. The results indicated that the 1.2% Ce-TiO2 coating with three layers exhibited an excellent photogenerated cathodic protection under illumination attributed to the higher separation efficiency of electron-hole pairs and higher photoelectric conversion efficiency. The results also showed that after doping with an appropriate concentration of cerium nitrate, the anti-corrosion performance of the TiO2 coating was improved even without irradiation due to the self-healing property of cerium ions.

  19. Titanium composite conversion coating formation on CRS In the presence of Mo and Ni ions: Electrochemical and microstructure characterizations

    Science.gov (United States)

    Eivaz Mohammadloo, H.; Sarabi, A. A.

    2016-11-01

    There have been an increasing interest in finding a replacement for the chromating process due to environmental and health concerns. Hence, in this study Chrome-free chemical conversion coatings were deposited on the surface of cold-rolled steel (CRS) on the basis of Titanium (TiCC), Titanium-Nickel (TiNiCC) and titanium-molybdate (TiMoCC) based conversion coating solutions. The surface characterization was performed by field emission scanning electron microscope (FESEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and contact angle measuring device. Also, the corrosion behavior was assessed by the means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. FESEM and AFM study show that the TiNiCC is denser and more uniform than that TiCC and TiMoCC since, TiMoCC conversion coating presents network feature, and there were abundant micro-cracks on the surface of the coating. XPS results confirmed the precipitation of Ti and Ni oxide/hydroxide, Mn dioxide/trioxide on the surface of different Ti-based conversion coatings. Electrochemical results revealed that all Ti-based conversion coatings have better anti-corrosion properties than bare CRS. Moreover, TiNiCC treatment inhibited the corrosion of CRS to a significant degree (polarization resistance (Rp) = 5510 Ω cm2) in comparison with TiCC (Rp = 2705 Ω cm2) and TiMoCC (Rp = 805 Ω cm2).

  20. A Robust Epoxy Resins @ Stearic Acid-Mg(OH)2 Micronanosheet Superhydrophobic Omnipotent Protective Coating for Real-Life Applications.

    Science.gov (United States)

    Si, Yifan; Guo, Zhiguang; Liu, Weimin

    2016-06-29

    Superhydrophobic coating has extremely high application value and practicability. However, some difficult problems such as weak mechanical strength, the need for expensive toxic reagents, and a complex preparation process are all hard to avoid, and these problems have impeded the superhydrophobic coating's real-life application for a long time. Here, we demonstrate one kind of omnipotent epoxy resins @ stearic acid-Mg(OH)2 superhydrophobic coating via a simple antideposition route and one-step superhydrophobization process. The whole preparation process is facile, and expensive toxic reagents needed. This omnipotent coating can be applied on any solid substrate with great waterproof ability, excellent mechanical stability, and chemical durability, which can be stored in a realistic environment for more than 1 month. More significantly, this superhydrophobic coating also has four protective abilities, antifouling, anticorrosion, anti-icing, and flame-retardancy, to cope with a variety of possible extreme natural environments. Therefore, this omnipotent epoxy resins @ stearic acid-Mg(OH)2 superhydrophobic coating not only satisfies real-life need but also has great application potential in many respects.

  1. Microstructure, corrosion properties and bio-compatibility of calcium zinc phosphate coating on pure iron for biomedical application.

    Science.gov (United States)

    Chen, Haiyan; Zhang, Erlin; Yang, Ke

    2014-01-01

    In order to improve the biocompatibility and the corrosion resistance in the initial stage of implantation, a phosphate (CaZn2(PO4)2·2H2O) coating was obtained on the surface of pure iron by a chemical reaction method. The anti-corrosion property, the blood compatibility and the cell toxicity of the coated pure iron specimens were investigated. The coating was composed of some fine phosphate crystals and the surface of coating was flat and dense enough. The electrochemical data indicated that the corrosion resistance of the coated pure iron was improved with the increase of phosphating time. When the specimen was phosphated for 30min, the corrosion resistance (Rp) increased to 8006 Ω. Compared with that of the naked pure iron, the anti-hemolysis property and cell compatibility of the coated specimen was improved significantly, while the anti-coagulant property became slightly worse due to the existence of element calcium. It was thought that phosphating treatment might be an effective method to improve the biocompatibility of pure iron for biomedical application.

  2. Research Progress of Waterborne Epoxy Resin Anticorrosion Coatings%水性环氧防腐涂料的研究进展

    Institute of Scientific and Technical Information of China (English)

    胡永玲

    2013-01-01

    The paper briefly introduced the preparation method of waterborne epoxy resin, from mechanical processres, reversal of phase, Chemical modification method. Their merits and faults, developing trends and synthetise is reviewed. I type and II type Waterborne epoxy resin curing agent is introduced with their Merits and faults, developing trends and preparation method. The development and future application. is forecasted.%  从机械法、相反转法、化学改性法三方面介绍了水性环氧树脂的制备方法,指出了水性环氧树脂的制备方法、优缺点和研究进展。介绍了 I 型水性环氧固化剂和Ⅱ型水性环氧固化剂的制备方法,优缺点和发展趋势。并对水性环氧防腐涂料的发展趋势和应用前景进行了展望。

  3. A polyaniline based intrinsically conducting coating for corrosion protection of structural steels.

    Science.gov (United States)

    Pan, Tongyan; Wang, Zhaoyang

    2013-11-01

    Among the various corrosion protection strategies for structural steels, coating techniques provide the most cost-effective protection and have been used as the primary mode of corrosion protection. Existing coating techniques however have been used mainly for their barrier capability and therefore all have a limited service life due to oxidation aging, electrolytic degradation, or various inadvertent defects and flaws occurred in and after coating applications. This work investigated the anti-corrosion potential of a π-conjugated polymer-polyaniline (PANi), which was doped into an intrinsically conducting polymer and then included in a two-layer coating system as a primer layer. To achieve a long service life, the primer layer was made by mixing the conductive PANi in a waterborne poly-vinyl butyral solution to provide strong adhesion to steel surface, and then topcoated with a layer of elastomer-modified polyethylene to obtain extra mechanical and barrier protections. Two ASTM standard tests were conducted to evaluate the corrosion durability and tensile adhesion of the two-layer system, in which the system demonstrated superior performance. The Scanning Kelvin Probe Force Microscopy (SKPFM) was used to provide the microscopic evidences for the outstanding performance.

  4. Study on Corrosion of the Foam Glass Anti-corrosion Lining%泡沫玻璃砖防腐内衬腐蚀研究

    Institute of Scientific and Technical Information of China (English)

    黎优霞; 冀运东

    2015-01-01

    Etching solution leaked from the thermal power plant wet chimney, which adopted domestic foam glass anti-corrosion lining and worked for a period of time. The performance of the foam glass anti-corrosion lining of it was studied in this paper. The properties of the foam glasses and plaster picking from the chimney lining were characterized by EDS and FT-IR. The results showed that the alkali metals (including Fe, K, Al, Na, Mg and so on) in the domestic foam glasses reacted with the acid corrosive media of the wet gas, which gave rise to the destruction of the closed pore structure and crisp cracking of the bricks; meanwhile, pendant groups on the polysiloxane matrix shed and Si-O-Si rigid structure increased in the main chain, which result in the loss of elasticity and adhesion of the plaster, then the foam dlass anti-corrosion lining fell off.%采用国产泡沫玻璃砖防腐内衬的火电厂湿烟囱,运行一段时间后,出现严重的渗透腐蚀现象。本文以湿烟囱排烟筒上脱落的泡沫玻璃砖为实验对象,利用EDS和FT-IR分别研究了国产泡沫玻璃砖和有机硅防腐胶泥的腐蚀状况及原理。结果表明,国产泡沫玻璃砖中含有Fe、K、Al、Na、Mg等碱金属,遇酸反应,导致砖体密闭孔隙结构破坏,酥化开裂,失去防腐作用;聚硅氧烷基体的侧基脱落,主链中Si-O-Si刚性结构增多,胶泥失去弹性和粘接性,导致防腐内衬整体脱落。

  5. Study of the degradations caused by nuclear accidental conditions on a steel coating

    Energy Technology Data Exchange (ETDEWEB)

    Ayrinhac, F.; Terriol, J.M. [EDF Ceidre TEGG (France)

    2011-07-01

    The coatings used in nuclear power plants have an interest to make surfaces easily decontaminated and to protect carbon steel (liner and steelworks) from the corrosion. However, in the event of accidental conditions, in particular combining radiation and fast increase of temperature and pressure, these paintings must not constitute an uncontrolled source of debris which may block the safety related functions of core cooling. This experimental study reports the influence of thickness and colour of the withstanding of a steel coating during accidental conditions. The steel coating chosen has been qualified for the liner containment of EDF new generation nuclear power plants (EPR). According to its data sheet, it is composed of an anti-corrosion primer (45 {mu}m), of an intermediate coat (same nature than the primer, 45 {mu}m) and a top coat (50 {mu}m). The system, applied using an conventional spray, was studied by optical and electronic microscopy. After gun airless application and drying, steel samples underwent an irradiation test, a LOCA test followed by a post-accident (100 C an d 100% HR during 10 days). Microscopic analysis by SEM and optical microscopy were carried out in order to evaluate and compare degradations of samples. In conclusion, whatever the color chosen or the thickness obtained, the primers and second coat ('internal layer') do not undergo significant evolution during the test. The greatest part of degradations is inflicted on the top coat. These degradations take the form of vacuums of two types, micro-porosity (few microns diameter) and surface blisters connected with internal spherical vacuums of size ranging between 8 and 50 {mu}m

  6. Merit and demerit effects of silver nanoparticles in the bioperformance of an electrodeposited hydroxyapatite: nanosilver composite coating

    Energy Technology Data Exchange (ETDEWEB)

    Ionita, D., E-mail: md_ionita@yahoo.com; Dilea, M., E-mail: mirela_dilea@yahoo.com [University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science (Romania); Titorencu, I., E-mail: irina.titorencu@icbp.ro [Institute of Cellular Biology and Pathology (Romania); Demetrescu, I., E-mail: i_demetrescu@chim.upb.ro [University Politehnica of Bucharest, Faculty of Applied Chemistry and Materials Science (Romania)

    2012-10-15

    For this research, TiAlZr specimens were covered with a hydroxyapatite-silver nanoparticles composite coatings (nAg-HA) prepared by pulse electrodeposition. The morphological texture of the nAg-HA nanoparticles on TiAlZr surface was investigated with scanning electron microscopy and energy dispersive X-ray spectroscopy. Electrochemical parameters from dynamic polarization tests performed in Ringer's solution indicate better anticorrosive properties for the TiAlZr alloy after nAg-HA electrodeposition. Bacteriological experiments performed in vitro demonstrate the efficacy of TiAlZr implants coated with nAg-HA against the growth of Escherichia coli bacteria quantified in a 98 % inhibition of Escherichia coli growth. The biocompatibility tests regarding cell adherence, proliferation, and viability of coating (also by means of Reverse Transcription Polymerase Chain Reaction-RT-PCR) completed the characterization of the coating, enabling us to discuss the merit and demerit effects of Ag nanoparticles (nAg) effects on bioperformance. Based on experimental and literature data, the coating could be considered a passive-active structure.

  7. Merit and demerit effects of silver nanoparticles in the bioperformance of an electrodeposited hydroxyapatite: nanosilver composite coating

    Science.gov (United States)

    Ionita, D.; Dilea, M.; Titorencu, I.; Demetrescu, I.

    2012-10-01

    For this research, TiAlZr specimens were covered with a hydroxyapatite-silver nanoparticles composite coatings (nAg-HA) prepared by pulse electrodeposition. The morphological texture of the nAg-HA nanoparticles on TiAlZr surface was investigated with scanning electron microscopy and energy dispersive X-ray spectroscopy. Electrochemical parameters from dynamic polarization tests performed in Ringer's solution indicate better anticorrosive properties for the TiAlZr alloy after nAg-HA electrodeposition. Bacteriological experiments performed in vitro demonstrate the efficacy of TiAlZr implants coated with nAg-HA against the growth of Escherichia coli bacteria quantified in a 98 % inhibition of Escherichia coli growth. The biocompatibility tests regarding cell adherence, proliferation, and viability of coating (also by means of Reverse Transcription Polymerase Chain Reaction—RT-PCR) completed the characterization of the coating, enabling us to discuss the merit and demerit effects of Ag nanoparticles (nAg) effects on bioperformance. Based on experimental and literature data, the coating could be considered a passive-active structure.

  8. POLYTETRAFLUOROETHYLENE-RICH POLYPHENLENESULFIDE BLEND TOP COATINGS FOR MITIGATING CORROSION OF CARBON STEEL IN 300 DEGREE CELCIUS BRINE.

    Energy Technology Data Exchange (ETDEWEB)

    SUGAMA, T.; JUNG, D.

    2006-06-01

    We evaluated usefulness of a coating system consisting of an underlying polyphenylenesulfide (PPS) layer and top polytetrafluoroethylene (PTFE)-blended PPS layer as low friction, water repellent, anti-corrosion barrier film for carbon steel steam separators in geothermal power plants. The experiments were designed to obtain information on kinetic coefficient of friction, surface free energy, hydrothermal oxidation, alteration of molecular structure, thermal stability, and corrosion protection of the coating after immersing the coated carbon steel coupons for up to 35 days in CO{sub 2}-laden brine at 300 C. The superficial layer of the assembled coating was occupied by PTFE self-segregated from PPS during the melt-flowing process of this blend polymer; it conferred an outstanding slipperiness and water repellent properties because of its low friction and surface free energy. However, PTFE underwent hydrothermal oxidation in hot brine, transforming its molecular structure into an alkylated polyfluorocarboxylate salt complex linked to Na. Although such molecular transformation increased the friction and surface free energy, and also impaired the thermal stability of PTFE, the top PTFE-rich PPS layer significantly contributed to preventing the permeation of moisture and corrosive electrolytes through the coating film, so mitigating the corrosion of carbon steel.

  9. Study of Nano-alumina Impact on the Performance of a CaCO3-Epoxy Composite Coating

    Directory of Open Access Journals (Sweden)

    Li Chen

    2016-06-01

    Full Text Available CaCO3-epoxy composite coatings containing different qualities of nano-Al2O3 were successfully prepared. Infrared spectroscopy was used to verify whether the nano- Al2O3 was modified successfully and scanning electron microscopic (SEM pictures were taken to study the inner morphology of the composite coatings. When tested by the hydraulic universal material testing system (MTS, it was found that the mechanical performances of composite coatings worsened after added nano-Al2O3. Thermo gravimetric analysis (TGA and differential scanning calorimetry (DSC indicated that the thermal stability of composite coatings increased after nano-Al2O3 was added; the abrasion resistance test explained that wear resistance also improved. Finally, it was found that the comprehen‐ sive performances of composite coatings for anticorrosion and adhesive strength were best after being tested under 63MPa and 165°C in an autoclave, when added at 10wt% nano-Al2O3.

  10. Highly flexible transparent self-healing composite based on electrospun core-shell nanofibers produced by coaxial electrospinning for anti-corrosion and electrical insulation

    Science.gov (United States)

    An, Seongpil; Liou, Minho; Song, Kyo Yong; Jo, Hong Seok; Lee, Min Wook; Al-Deyab, Salem S.; Yarin, Alexander L.; Yoon, Sam S.

    2015-10-01

    Coaxial electrospinning was used to fabricate two types of core-shell fibers: the first type with liquid resin monomer in the core and polyacrylonitrile in the shell, and the second type with liquid curing agent in the core and polyacrylonitrile in the shell. These two types of core-shell fibers were mutually entangled and embedded into two flexible transparent matrices thus forming transparent flexible self-healing composite materials. Such materials could be formed before only using emulsion electrospinning, rather than coaxial electrospinning. The self-healing properties of such materials are associated with release of healing agents (resin monomer and cure) from nanofiber cores in damaged locations with the subsequent polymerization reaction filing the micro-crack with polydimethylsiloxane. Transparency of these materials is measured and the anti-corrosive protection provided by them is demonstrated in electrochemical experiments.

  11. Effects of Ti-C:H coating and plasma nitriding treatment on tribological, electrochemical, and biocompatibility properties of AISI 316L.

    Science.gov (United States)

    Kao, W H; Su, Y L; Horng, J H; Zhang, K X

    2016-08-01

    Ti-C:H coatings were deposited on original, nitrided, and polished-nitrided AISI 316L stainless steel substrates using a closed field unbalanced magnetron sputtering system. Sliding friction wear tests were performed in 0.89 wt.% NaCl solution under a load of 30 N against AISI 316L stainless steel, Si3N4, and Ti6Al4V balls, respectively. The electrochemical properties of the various specimens were investigated by means of corrosion tests performed in 0.89 wt.% NaCl solution at room temperature. Finally, the biocompatibility properties of the specimens were investigated by performing cell culturing experiments using purified mouse leukemic monocyte macrophage cells (Raw264.7). In general, the results showed that plasma nitriding followed by Ti-C:H coating deposition provides an effective means of improving the wear resistance, anti-corrosion properties, and biocompatibility performance of AISI 316L stainless steel.

  12. 人工加速老化对聚脲涂科防护性能的影响%Influence of artificial accelerated aging on the protective performance of polyurea coatings

    Institute of Scientific and Technical Information of China (English)

    李全德; 孟惠民

    2011-01-01

    针对聚脲涂料防腐涂层进行紫外加速老化实验,采用光泽度计、扫描电子显微镜(SEM)以及傅里叶变换红外光谱仪(FTIR)分析并结合电化学阻抗谱(EIS)图谱,研究涂层的老化行为.结果表明:涂层的老化分为前期、中期和后期三阶段,涂层表面在老化中期变色较大.涂层的表面、断面SEM及EIS测试显示涂层中的微气泡阻止了涂层的老化裂纹向基体发展,涂层仍保持较好的防护性能.%UV accelerated aging was performed on polyurea anti-corrosion coatings. The aging behavior of the coatings was analyzed by gloss meter, scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) in combination with electrochemical impedance spectroscopy (EIS). Experiment results indicate that the coating accelerated aging is divided into early,middle and late stages. The color of the coating surface changes severely in the middle stage. SEM images of the coating surface and cross section show that the development of aging cracks to the substrate is terminated by tiny bubbles, and the anticorrosion performance of the coatings declines very slightly.

  13. Corrosion resistant coating

    Science.gov (United States)

    Wrobleski, Debra A.; Benicewicz, Brian C.; Thompson, Karen G.; Bryan, Coleman J.

    1997-01-01

    A method of protecting a metal substrate from corrosion including coating a metal substrate of, e.g., steel, iron or aluminum, with a conductive polymer layer of, e.g., polyaniline, coating upon said metal substrate, and coating the conductive polymer-coated metal substrate with a layer of a topcoat upon the conductive polymer coating layer, is provided, together with the resultant coated article from said method.

  14. Coatings and Corrosion Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — Purpose: The mission of the Coatings and Corrosion Laboratory is to develop and analyze the effectiveness of innovative coatings test procedures while evaluating the...

  15. Development of nanostructured coatings for protecting the surface of aluminum alloys against corrosion and ice accretion

    Science.gov (United States)

    Farhadi, Shahram

    Ice and wet snow accretion on outdoor structures is a severe challenge for cold climate countries. A variety of de-icing and anti-icing techniques have been developed so far to counter this problem. Passive approaches such as anti-icing or icephobic coatings that inhibit or retard ice accumulation on the surfaces are gaining in popularity. Metal corrosion should also be taken into account as metallic substrates are subject to corrosion problems when placed in humid or aggressive environments. Development of any ice-releasing coatings on aluminum structures, as they must be durable enough, is therefore closely related to anti-corrosive protection of that metal. Accordingly, series of experiments have been carried out to combine reduced ice adhesion and improved corrosion resistance on flat AA2024 substrates via thin films of single and double layer alkyl-terminated SAMs coatings. More precisely, alkyl-terminated aluminum substrates were prepared by depositing layer(s) of 18C-SAMs on BTSE-grafted AA2024 or mirror-polished AA2024 surfaces. This alloy is among the most widely used aluminum alloys in transportation systems (including aircraft), the military, etc. The stability of the coatings in an aggressive environment, their overall ice-repellent performance as well as their corrosion resistance was systematically studied. The stability of one-layer and two-layer coatings in different media was tested by means of CA measurements, demonstrating gradual loss of the hydrophobic property after ~1100-h-long immersion in water, associated by decrease in water CA. Surface corrosion was observed in all cases, except that the double-layer coating system provided improved anti-corrosive protection. All single layer coatings showed initial shear stress of ice detachment values of ~1.68 to 2 times lower than as-received aluminum surfaces and about ~1.22 to 1.5 times lower than those observed on mirror-polished surfaces. These values gradually increased after as many as 5 to 9

  16. Effects of Copper and Titanium Elements on the Coating's Properties of Hot-Dipping-Aluminum Steel

    Institute of Scientific and Technical Information of China (English)

    JIA Wei-ping; MA Yun-long; HU Lin; KE Wei

    2004-01-01

    The steel plates for testing obtained a clean and fresh surface after degreasing by alkali and acidity and to be protested from reoxidation by being dipped into liquid wax. The results after hot dipping experiments in lab. showed that a complete aluminized coat with a good property could be obtained under a condition of hot-dipping temperature at about 730 ℃, hot -dipping time at about 2 minutes. It was found that the transition layer was mainly composed of Fe2 Al5 intermetallic compound by SEM (Scanning Electronic Microscope) observation. Effects of elements copper and titanium in aluminum coating on adherence quality, corrosion resistance performance and thickness of the transition layer were investigated, the following results were drawn: The adherence quality is strongly enhancedby copper element and gives the best performance at the 2% mass percent content of copper, while it is almost indifferent with titanium content. The corrosion resistance property is enhanced by titanium and is deteriorated by copper, when the mass percent content of titaniumis 0.3% , the coating exhibits the best anti-corrosion performance. At present condition, both copper and titanium make transition layer thinner.

  17. Study on cerium-doped nano-TiO2 coatings for corrosion protection of 316 L stainless steel.

    Science.gov (United States)

    Li, Suning; Wang, Qian; Chen, Tao; Zhou, Zhihua; Wang, Ying; Fu, Jiajun

    2012-04-19

    Many methods have been reported on improving the photogenerated cathodic protection of nano-TiO2 coatings for metals. In this work, nano-TiO2 coatings doped with cerium nitrate have been developed by sol-gel method for corrosion protection of 316 L stainless steel. Surface morphology, structure, and properties of the prepared coatings were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The corrosion protection performance of the prepared coatings was evaluated in 3 wt% NaCl solution by using electrochemical techniques in the presence and absence of simulated sunlight illumination. The results indicated that the 1.2% Ce-TiO2 coating with three layers exhibited an excellent photogenerated cathodic protection under illumination attributed to the higher separation efficiency of electron-hole pairs and higher photoelectric conversion efficiency. The results also showed that after doping with an appropriate concentration of cerium nitrate, the anti-corrosion performance of the TiO2 coating was improved even without irradiation due to the self-healing property of cerium ions.

  18. 两种可应用于恶劣环境的空调高防腐粉末%Two types of High-anticorrosive Powder Applied in Air-conditioner in Severe Environment

    Institute of Scientific and Technical Information of China (English)

    林路; 江秀华

    2014-01-01

    本文介绍两种空调用高防腐粉末的设计及在空调钢板上的应用,并通过盐雾实验来评定其防腐性能。结果表明,高防腐粉末可以有效提高空调的防腐性,扩大空调的使用环境。%This paper introduces the design of high-anticorrosive powder and the time the salt spray test in the steel plate of air-conditioner that can be attained. The practical conditions indicates that high-anticorrosive powder effec-tively improves the corrosion resistance of air-conditioner, and expands the operating environment of it.

  19. CHARACTERIZATION AND PROCESSING OF SCALES FROM THE MECHANICAL DESCALING OF CARBON STEELS FOR RECYCLING AS COATING PIGMENTS

    Directory of Open Access Journals (Sweden)

    Anderson de Oliveira Fraga

    2014-10-01

    Full Text Available The large volume of solid wastes generated as scales in Steel Mills accounts to circa 1% to 2% of the total steel production and has led to studies aiming the recycling of scales, usually resulting in products of low added value. In this study, scales from the mechanical descaling of SAE 1045 steel were characterized by SEM and by quantitative X-Ray diffraction (Rietveld method, as well as by differential thermal analysis, aiming to develop its pretreatment for the further use as lamellar pigments in anticorrosive coatings of high added value. Aspect ratios between 1:50 and 1:100 were obtained by the processing of scales, which allows the replacement of other micaceous iron oxides.

  20. Multi-layer coatings

    Energy Technology Data Exchange (ETDEWEB)

    Maghsoodi, Sina; Brophy, Brenor L.; Abrams, Ze' ev R.; Gonsalves, Peter R.

    2016-06-28

    Disclosed herein are coating materials and methods for applying a top-layer coating that is durable, abrasion resistant, highly transparent, hydrophobic, low-friction, moisture-sealing, anti-soiling, and self-cleaning to an existing conventional high temperature anti-reflective coating. The top coat imparts superior durability performance and new properties to the under-laying conventional high temperature anti-reflective coating without reducing the anti-reflectiveness of the coating. Methods and data for optimizing the relative thickness of the under-layer high temperature anti-reflective coating and the top-layer thickness for optimizing optical performance are also disclosed.

  1. Synthesis of P(St-BA-MAA-SPAA) nano-latex and its application in high anti-corrisive coating

    Institute of Scientific and Technical Information of China (English)

    LIU Hai-feng; SHENG Ming-shuang; PAN Zhao-ji; QIU Da-jian; GUO Zhi-hua; GAN Fu-xing

    2008-01-01

    A novel zinc-rich pigment based on P(St-BA-MAA-SPAA) nano-latex was obtained, which is suitable for the use in hot alkali liquid medium. The nano-latex was synthesized by active emulsifier latex polymerization method with monomers of styrene(St), butylaerylate (BA), methylacrylic acid(MAA) in the presence of active emulsifier 3-sulfopropylaerylate(SPAA). The synthesis condition and properties of the latex were investigated. And the anti-corrosive property of the resultant zinc-rich coating was studied. The results show that the nano-latex is self-stabilized and has a narrow particle diameter distribution, the average diameter of the latex particles is 71 nm. Zinc powders can be evenly dispersed in the nano-latex, which indicates that the P(St-BA-MAA-SPAA)nano latex can be used as the binder of zinc-rich coating. The resultant zinc-rich coating is able to resist the invasion of hot alkali solution(the temperature is 95 ℃ and the pH value is 14) for 480 h and the exposure time in salt spray is 1 200 h. Moreover, the coating shows good thermal conductivity and static electricity properties, its thermal conductivity and electric resistivity are 21-37 W/(m·K) and 6.7×105-3.5×106 Ω.cm, respectively

  2. Electron beam processed plasticized epoxy coatings for surface protection

    Energy Technology Data Exchange (ETDEWEB)

    Ibrahim, Mervat S. [National Center for Radiation Research and Technology, Nasr City (Egypt); Mohamed, Heba A., E-mail: hebaamohamed@gmail.com [National Research Center, Dokki (Egypt); Kandile, Nadia G. [University College for Girls, Ain Shams University (Egypt); Said, Hossam M.; Mohamed, Issa M. [National Center for Radiation Research and Technology, Nasr City (Egypt)

    2011-10-17

    Highlights: {center_dot} Coating formulations with EA 70%, HD 20%, and castor oil 10% under 1 Mrad pass{sup -1} irradiation dose showed the best adhesion and passed bending tests. {center_dot} The prepared EP-SF-An adduct improve anti-corrosion properties of coatings without any significant effect on physical, mechanical and chemical properties of the cured film. The optimum amount of aniline adduct as corrosion inhibitor was found to be 0.4 g for 100 g of coating formulation. {center_dot} The corrosion inhibition efficiency of the prepared adduct competed the commercial efficiency. - Abstract: Epoxy acrylate oligomer (EA) was plasticized by adding different plasticizers such as epoxidized soybean oil, glycerol and castor oil and cured by electron beam (EB). Different irradiation doses (1, 2.5 and 5 Mrad pass{sup -1}) were used in the curing process. The effect of both different irradiation doses and plasticizers on the end use performance properties of epoxy acrylate coating namely, pencil hardness, bending test, adhesion test, acid and alkali resistance test were studied. It was observed that incorporation of castor oil in epoxy acrylate diluted by 1,6-hexanediol diacrylate (HD) monomer with a ratio (EA 70%, HD 20%, castor oil 10%) under 1 Mrad pass{sup -1} irradiation dose improved the physical, chemical and mechanical properties of cured films than the other plasticizer. Sunflower free fatty acid was epoxidized in situ under well established conditions. The epoxidized sunflower free fatty acids (ESFA) were subjected to react with aniline in sealed ampoules under inert atmosphere at 140 deg. C. The produced adducts were added at different concentrations to epoxy acrylate coatings under certain EB irradiation dose and then evaluated as corrosion inhibitors for carbon steel surfaces in terms of weight loss measurements and corrosion resistance tests. It was found that, addition of 0.4 g of aniline adduct to 100 g epoxy acrylate formula may give the best corrosion

  3. Titanium composite conversion coating formation on CRS In the presence of Mo and Ni ions: Electrochemical and microstructure characterizations

    Energy Technology Data Exchange (ETDEWEB)

    Eivaz Mohammadloo, H.; Sarabi, A.A., E-mail: Sarabi@aut.ac.ir

    2016-11-30

    Highlights: • Eco-friendly protective thin films for covering the CRS substrates were presented. • Comprehensive analyses were performed to evaluate the surface characteristics. • Promising approach for the surface modification of CRS substrate by Ti-based conversion coatings. - Abstract: There have been an increasing interest in finding a replacement for the chromating process due to environmental and health concerns. Hence, in this study Chrome-free chemical conversion coatings were deposited on the surface of cold-rolled steel (CRS) on the basis of Titanium (TiCC), Titanium-Nickel (TiNiCC) and titanium-molybdate (TiMoCC) based conversion coating solutions. The surface characterization was performed by field emission scanning electron microscope (FESEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and contact angle measuring device. Also, the corrosion behavior was assessed by the means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. FESEM and AFM study show that the TiNiCC is denser and more uniform than that TiCC and TiMoCC since, TiMoCC conversion coating presents network feature, and there were abundant micro-cracks on the surface of the coating. XPS results confirmed the precipitation of Ti and Ni oxide/hydroxide, Mn dioxide/trioxide on the surface of different Ti-based conversion coatings. Electrochemical results revealed that all Ti-based conversion coatings have better anti-corrosion properties than bare CRS. Moreover, TiNiCC treatment inhibited the corrosion of CRS to a significant degree (polarization resistance (R{sub p}) = 5510 Ω cm{sup 2}) in comparison with TiCC (R{sub p} = 2705 Ω cm{sup 2}) and TiMoCC (R{sub p} = 805 Ω cm{sup 2}).

  4. Coating of pumps; coating af pumper

    Energy Technology Data Exchange (ETDEWEB)

    Andersen, Hans; Moritzen, J.; Thoegersen, Jeanette

    2005-11-15

    Coating of pumps is a quite new activity. For many years pipes and containers have been coated inside in order to avoid corrosion, but the technology has only been used inside pumps for the last ten years. The technology comes from USA and is originally developed in the space technology industry as an exceptionally durable and corrosion constant coating. The project is a further development of results found in a previous R and D project in which measurements were performed before and after coating two different installations. Both installations showed large efficiency improvements. This project supplements the theory behind losses in pumps with measurements on more pumps. (BA)

  5. 溴碳树脂在防火涂料中的应用与发展%Application and Development of Bromine Carbon Resin Fire-retardant Coatings

    Institute of Scientific and Technical Information of China (English)

    吴纯.; 杨保平; 崔锦峰; 郭军红; 李军

    2012-01-01

    This paper reviews the achievements of the fire-retardant coatings research and utilization from the aspect of binder resins, introduces the application of bromine carbon resin in steel structure fire-retardant coatings, finishing fire-retardant coatings, fire- retardant anticorrosive floor coatings and water-borne environment-friendly fire-retardant coatings in details, and basing the actual situation of our country, gives the use prospect of the bromine carbon resin.%综述了近年来从基体树脂入手,在防火涂料的研究与应用中的成果,详细介绍了溴碳树脂在钢结构建筑防火涂料、饰面型防火涂料、防火防腐地坪涂料及水性环保型防火涂料中的应用情况,并结合我国的实际情况对溴碳树脂的应用前景进行了展望。

  6. Architectural optimization of an epoxy-based hybrid sol-gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

    Science.gov (United States)

    Murillo-Gutiérrez, N. V.; Ansart, F.; Bonino, J.-P.; Kunst, S. R.; Malfatti, C. F.

    2014-08-01

    An epoxy-based hybrid sol-gel coating was prepared in various architectural configurations has been studied for the corrosion protection of a cast Elektron21 magnesium alloy. The creation of a single layer of this coating presents defects consisting of macro-pores and protuberances, which opens access for corrosive species to reach the metallic substrate. These defects are suspected to result from the high reactivity of the substrate, as well as to the irregular topography of the substrate disrupted by the microstructure of the own magnesium alloy. Hence, a sol-gel coating in bilayer architecture is proposed, where the first layer would “inert” the surface of the magnesium substrate, and the second layer would cover the defects of the first layer and also thickening the coating. The morphological characteristics of the sol-gel coatings were analyzed by scanning electron microscopy (SEM), and their corrosion behavior was evaluated by OCP (open circuit potential) monitoring and electrochemical impedance spectroscopy (EIS) in chloride media. It is shown that both the architectural arrangement and the individual thickness of the first and second layers have an important influence on the anticorrosion performances of the protective system, just as much as its global thickness.

  7. Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

    Energy Technology Data Exchange (ETDEWEB)

    Murillo-Gutiérrez, N.V., E-mail: murillo@chimie.ups-tlse.fr [Université de Toulouse UPS-INP-CNRS, Institut Carnot CIRIMAT, Toulouse (France); Ansart, F.; Bonino, J-P. [Université de Toulouse UPS-INP-CNRS, Institut Carnot CIRIMAT, Toulouse (France); Kunst, S.R.; Malfatti, C.F. [Universidade Federal do Rio grande do Sul, Laboratory of Corrosion Research (LAPEC), Porto Alegre (Brazil)

    2014-08-01

    An epoxy-based hybrid sol–gel coating was prepared in various architectural configurations has been studied for the corrosion protection of a cast Elektron21 magnesium alloy. The creation of a single layer of this coating presents defects consisting of macro-pores and protuberances, which opens access for corrosive species to reach the metallic substrate. These defects are suspected to result from the high reactivity of the substrate, as well as to the irregular topography of the substrate disrupted by the microstructure of the own magnesium alloy. Hence, a sol–gel coating in bilayer architecture is proposed, where the first layer would “inert” the surface of the magnesium substrate, and the second layer would cover the defects of the first layer and also thickening the coating. The morphological characteristics of the sol–gel coatings were analyzed by scanning electron microscopy (SEM), and their corrosion behavior was evaluated by OCP (open circuit potential) monitoring and electrochemical impedance spectroscopy (EIS) in chloride media. It is shown that both the architectural arrangement and the individual thickness of the first and second layers have an important influence on the anticorrosion performances of the protective system, just as much as its global thickness.

  8. Analysis of electrochemical noise data in both time and frequency domains to evaluate the effect of ZnO nanopowder addition on the corrosion protection performance of epoxy coatings

    Directory of Open Access Journals (Sweden)

    H. Ashassi-Sorkhabi

    2016-11-01

    Full Text Available Epoxy–ZnO nanocomposite coatings have been developed for corrosion protection of steel. Structural characterization of the prepared nanocomposites was performed using scanning electron microscopy (SEM. The anti-corrosive properties of the coatings were evaluated by electrochemical noise (EN. On the basis of the EN results in both time and frequency domains, the nanocomposite material with low ZnO concentration (0.1% wt.% was found to be much superior in corrosion protection when tested in aqueous NaCl electrolyte. Finally, EIS measurements were carried out and the data fitted with suitable equivalent circuit. Resistance parameters obtained by both techniques were found to be in relatively good agreement.

  9. 除氧器安装与调试阶段的防腐保养%Deaerator Installation and Commissioning Stage of the Anti-corrosion Maintenance

    Institute of Scientific and Technical Information of China (English)

    孔全兴; 赵万祥; 常勤勤; 蒋林中; 龙磊军; 廖学波

    2014-01-01

    介绍国内某核电厂安装与调试阶段除氧器发生的腐蚀情况。通过对其腐蚀环境和机理进行分析,确认安装与调试阶段保养不当是产生腐蚀的原因。结合核电厂现场情况,提出了安装与调试阶段对除氧器进行防腐保养的方法。有效解决了除氧器在核电厂建设阶段的腐蚀问题,保证设备的使用寿命。%The article introduces a domestic nuclear power plant installation and commissioning stage of the corrosion situation of The deaerator. Through the analysis of its corrosion environment and mechanism, confirm maintain undeserved is the reasons for corrosion in installation and commissioning stage. Combined with field condition , Proposes the installation and commissioning stage of deaerator anti-corrosion maintenance method, effectively solve the deaerator stages of corrosion problems in nuclear power plant construction, ensure the service life of equipment.

  10. 基于城市燃气管道防腐设计的研究%Research on the Anticorrosion Design of Urban Gas Pipeline

    Institute of Scientific and Technical Information of China (English)

    王有之

    2015-01-01

    作为城市发展的重要燃气资源,天然气的正常输送是保障社会效益和企业经济效益的关键。为保证燃气资源的输送质量,必须采取有效措施控制燃气管道的腐蚀,尽可能减少燃气输送安全事故,降低管道输送成本,提高燃气输送的安全性。主要深入探究了城市燃气管道防腐设计的相关内容。%As the important gas resource of urban development, the normal transportation of natural gas is the key to protect the social benefit and the economic benefit of the enterprise. In order to ensure the transportation quality of gas resources, we must take effective measures to corrosion control of gas pipeline, as far as possible to reduce safety accidents in gas transportation, reducing the transportation cost of a pipeline, to improve the safety of gas transmission. The contents of anticorrosion design for urban gas pipeline are mainly explored in the main.

  11. Effect of electrolysis superheat degree on anticorrosion performance of 5Cu/(10NiO-NiFe2O4) cermet inert anode

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    5Cu/(10NiO-NiFe2O4) cermet inert anodes were prepared by cold-pressing and sintering process, and the effect of superheat degree of melting K3AIF6-Na3AlF6-AlF3 on their anticorrosion performance was studied under electrolysis conditions. The results show that, the fluctuation of cell becomes small with increasing of superheat degree, which is helpful to inhibit the formation of cathodic encrustation; the concentration of impurities from inert anode in bath goes up to certain degree, but it is far smaller than those in traditional high-temperature bath. Increasing the superheat degree of melting K3AlF6-Na3AlF6-AlF3 has unconspicuous effect on the contents of impurities in cathodic aluminum. The total mass fractions of Fe, Ni and Cu in aluminum are 15.38% and15.09% respectively under superheat degree of 95 and 195 ℃C. From micro-topography of anode used view, increasing the superheat degree can aggravate corrosion of metal Cu in inert anode, and has negative influence on electrical conductivity of electrode to some extent.

  12. 多重防腐锚杆在海底隧道施工中的应用%Application of Multiple Anticorrosive Anchors in Subsea Tunnel Construction

    Institute of Scientific and Technical Information of China (English)

    吴小珍

    2012-01-01

    This paper introduces the application of multiple anticorrosive anchors in the primary-stage construction support for sea segment according to the construction practice of Qingdao channel tunnel construction. The applications are divided into the following parts; the working principle, parameter selection, construction technology, quality control and so on. Suggestions are put forward on problems and their solutions, which can be referenced for similar projects.%依据青岛海底隧道第三施工合同段的施工实践,介绍了多重防腐锚杆在海域段初期支护中的应用.从系统锚杆的工作原理、锚杆参数选择、施工工艺、质量控制等方面做了详细的介绍,对期间遇到的问题及解决方法也提出了建议和意见,可为类似工程提供借鉴.

  13. Anti-corrosion Performance of a New Corrosion Inhibitor for Rebar%一种新型钢筋阻锈剂的阻锈性能

    Institute of Scientific and Technical Information of China (English)

    阚欣荣; 封孝信; 王晓燕

    2011-01-01

    The anti-corrosion performance of a new rebar inhibitor containing amino group and carboxylic group was evaluated by means of hardened mortar test and half cell potential method. The adsorption of corrosion inhibitor on rebar in concrete was analyzed. The results show that the corrosion inhibitor could delay the corrosion and reduce the corrosion rate of the rebar.%采用硬化砂浆和半电池电位法评价了一种自制的含有氨基和羧基的新型钢筋阻锈剂IH2的阻锈性能,并采用标准工作曲线法分析了混凝土中钢筋对阻锈剂的吸附性能。结果表明,IH2钢筋阻锈剂可以延长钢筋发生锈蚀的时间,降低钢筋的腐蚀速率,具有良好的阻锈性能。

  14. 综合防腐技术在肉制品生产中的应用%Comprehensive Anti-corrosion Technology in Meat Production

    Institute of Scientific and Technical Information of China (English)

    韩磊

    2016-01-01

    With the development of economy, the quality of people's daily life is increasing continuously. Consumer demand for food is also gradually strict, especially for meat quality requirements have become strict. At present, the emergence of comprehensive anti corrosion technology to meat production technology has been improved, but also on the meat of the anti-corrosion ability has been greatly improved. On the perception and freshness of meat products have been largely improved.%随着经济的发展,人们的日常生活质量不断提高,消费者对食品的要求也逐渐严格,特别是对肉制品质量要求也变得严格起来。目前,综合防腐技术的出现对肉制品制作技术得到了提高,同时也对肉制品的防腐能力得到了很大的提高。对肉类产品的观感与新鲜度得到了很大程度上的改善。

  15. Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

    Directory of Open Access Journals (Sweden)

    Rita B. Figueira

    2016-03-01

    Full Text Available Corrosion degradation of materials and metallic structures is one of the major issues that give rise to depreciation of assets, causing great financial outlays in their recovery and or prevention. Therefore, the development of active corrosion protection systems for metallic substrates is an issue of prime importance. The promising properties and wide application range of hybrid sol-gel-derived polymers have attracted significant attention over recent decades. The combination of organic polymers and inorganic materials in a single phase provides exceptional possibilities to tailor electrical, optical, anticorrosive, and mechanical properties for diverse applications. This unlimited design concept has led to the development of hybrid coatings for several applications, such as transparent plastics, glasses, and metals to prevent these substrates from permeation, mechanical abrasion, and corrosion, or even for decorative functions. Nevertheless, the development of new hybrid products requires a basic understanding of the fundamental chemistry, as well as of the parameters that influence the processing techniques, which will briefly be discussed. Additionally, this review will also summarize and discuss the most promising sol-gel coatings for corrosion protection of steel, aluminium, and their alloys conducted at an academic level.

  16. Commercial Fastener Coatings Doerken

    Science.gov (United States)

    2010-06-01

    Phosphating* *partly recommended Dip Spinning Dipping Spraying Spin coating Conveyor oven box oven Inductive drying Pretreatment Coating Preheating...Curing Cooling Application Techniques - Dip Spin Coating Gurtbnd Cross BarTranspo" Band beiCifteiE Vo12one Vent llated Pre .Zone Cros~ Bar T ransrt

  17. PIT Coating Requirements Analysis

    Energy Technology Data Exchange (ETDEWEB)

    MINTEER, D.J.

    2000-10-20

    This study identifies the applicable requirements for procurement and installation of a coating intended for tank farm valve and pump pit interior surfaces. These requirements are intended to be incorporated into project specification documents and design media. This study also evaluates previously recommended coatings and identifies requirement-compliant coating products.

  18. Surfaces, Coatings and Protection

    Science.gov (United States)

    Ferguson, I. F.

    1982-08-01

    Plasma sprayed ceramics, sputter ion plating, and sol-gel ceramic protective coatings for nuclear reactors are discussed. The influence of such coatings on the behavior of reactor fuel elements is noted. The investigation of such coatings by diffraction methods is described. Laser and nuclear microprobes, scanning transmission electron microscopes, neutron scattering, and image analysis are summarized.

  19. Hard and superhard nanocomposite coatings

    Energy Technology Data Exchange (ETDEWEB)

    Musil, J. [Univ. of West Bohemia, Plzen (Czech Republic). Dept. of Phys.

    2000-03-01

    This article reviews the development of hard coatings from a titanium nitride film through superlattice coatings to nanocomposite coatings. Significant attention is devoted to hard and superhard single layer nanocomposite coatings. A strong correlation between the hardness and structure of nanocomposite coatings is discussed in detail. Trends in development of hard nanocomposite coatings are also outlined. (orig.)

  20. PROPERTIES OF ORGANIC COATINGS CONTAINING PIGMENTS WITH SURFACE MODIFIED WITH A LAYER OF ZnFe2O4

    Directory of Open Access Journals (Sweden)

    Kateřina Nechvílová

    2015-11-01

    Full Text Available This work is focussed on the properties of organic coatings containing pigments whose surface was chemically coated with zinc ferrite (ZnFe2O4 layer. Four silicate types with different particle shapes were selected as the cores: diatomite, talc, kaolin and wollastonite. The untreated particles exhibit a barrier effect. The aim of this project was to apply the surface treatment approach with a view to enhancing not only the model paint films’ anticorrosion properties but also their resistance to physico- mechanical tests pursuant to ISO standards (cupping, bending, impact, adhesion. Other parameters examined included: particle size and morphology, density of the modified pigment, oil consumption, pH, conductivity, and electrochemical properties of the paint film. A solvent-based epoxy-ester resin was used as the binder and also served as the reference material. The pigment volume concentration (PVC was 1% and 10%. During the last stage of the experiment, the paint films were exposed to a corrosive environment stimulating seaside conditions or conditions roads treated with rock salt. The accelerated cyclic corrosion test in a neutral salt mist atmosphere was conducted for 864 hours. The results served to ascertain a suitable environment for organic coatings.

  1. Vegetable-Oil-Based Hyperbranched Polyester-Styrene Copolymer Containing Silver Nanoparticle as Antimicrobial and Corrosion-Resistant Coating Materials

    Directory of Open Access Journals (Sweden)

    Manawwer Alam

    2013-01-01

    Full Text Available Pongamia oil (PO was converted to Pongamia oil hydroxyl (POH via epoxidation process. The esterification of POH with linolenic acid was carried out to form hyperbranched polyester (HBPE, and further styrenation was performed at the conjugated double bond in the chain of linolenic acid. After styrenation, silver nanoparticle was added in different weight percentages (0.1–0.4 wt%. The structural elucidation of POH, HBPE, and HBPE-St was carried out by FT-IR, 1H-NMR, and 13C-NMR spectroscopic techniques. Physicochemical and physicomechanical analyses were performed by standard method. Thermal behavior of the HBPE-St was analyzed by using thermogravimetric analysis (TGA and differential scanning calorimetry (DSC. The coatings of HBPE-St were prepared on mild steel strips. The anticorrosive behavior of HBPE-St resin-based coatings in acid, saline, and tap water was evaluated, and the molecular weight of HBPE-St was determined by gel permeation chromatography (GPC. The antibacterial activities of the HBPE-St copolymers were tested in vitro against bacteria and fungi by disc diffusion method. The HBPE-St copolymers exhibited good antibacterial activities and can be used as antimicrobial and corrosion-resistant coating materials.

  2. Present Status and Development Trend of Research on Organic Coating System for Mg Alloy%镁合金有机涂层体系研究现状及发展趋势

    Institute of Scientific and Technical Information of China (English)

    陶军; 龙思远; 刘榆; 宋东福

    2011-01-01

    The advantages and disadvantages, anti-corrosion strategy, organic coatings and pretreatment processes of Mg alloy were described. The features and present research status of several organic coating system for Mg alloys, including chemical conversion/organic coating system, micro-arc oxidation/organic coating system, double organic coating system etc, were introduced. The development trends of organic coating system for Mg alloy were pointed out.%叙述了镁合金的优缺点、镁合金的防腐蚀策略、镁合金常用的有机涂料和预处理工艺.介绍了几种镁合金有机涂层体系(包括化学转化/有机涂层体系、微弧氧化/有机涂层体系、复合有机涂层体系等)的特点及研究现状.指出了今后镁合金有机涂层体系的发展趋势.

  3. 6061铝合金表面无铬稀土镧转化膜性能的研究%Research on Performance of Chrome-free Rare Earth Lanthanum Conversion Coating on 6061 Aluminum Alloy Surface

    Institute of Scientific and Technical Information of China (English)

    李红玲; 刘清玲

    2013-01-01

    [摘 要] 利用极化曲线方法,研究了以La(NO3)3·6H2O为促进剂的磷酸盐转化膜的耐蚀性,同时与铬磷化膜及无稀土促进的单纯磷酸盐膜的耐蚀性进行了对比;通过划格法和全浸腐蚀试验,研究了这三种转化膜与有机涂层间的结合力.结果发现:与单纯磷酸盐膜相比,稀土促进生成的磷酸盐膜中的传输阻力增加,耐蚀性明显增强,而与铬磷化膜相比,二者在弱极化区的耐蚀性能相近;稀土促进生成的磷酸盐膜与有涂层间的结合力明显优于铬磷化膜.%The anti-corrosion of the conversion coating which is formed by La(NO3) 3 · 6H2O was evaluated with polarization curve,and also compared the chromium phosphate film and non-rare phosphate conversion coating.Adhesion force between the conversion coatings and the organic coating were studied through crossing grid method and immersing corrosion test.The results showed that the transmission resistance of conversion coating with rare earth additive was increased by comparing with non-rare phosphate conversion coating; The anti-corrosion of the conversion coating was increased noticeably.But comparing with chromium phosphting,in the weak polarized scope,both of the corrosion resistances were close.Adhesion force between the conversion coating with rare earth as additive and the organic coating was obviously superior to that of chromate phosphate process.

  4. Antibacterial polymer coatings.

    Energy Technology Data Exchange (ETDEWEB)

    Wilson, Mollye C.; Allen, Ashley N.; Barnhart, Meghan; Tucker, Mark David; Hibbs, Michael R.

    2009-09-01

    A series of poly(sulfone)s with quaternary ammonium groups and another series with aldehyde groups are synthesized and tested for biocidal activity against vegetative bacteria and spores, respectively. The polymers are sprayed onto substrates as coatings which are then exposed to aqueous suspensions of organisms. The coatings are inherently biocidal and do not release any agents into the environment. The coatings adhere well to both glass and CARC-coated coupons and they exhibit significant biotoxicity. The most effective quaternary ammonium polymers kills 99.9% of both gram negative and gram positive bacteria and the best aldehyde coating kills 81% of the spores on its surface.

  5. Design of Norway HAKRDANGER Steel Box Girder Bridge Coating Process%挪威HAKRDANGER大桥钢箱梁涂装工艺设计

    Institute of Scientific and Technical Information of China (English)

    李连缀; 李敏风

    2011-01-01

    The anti-corrosion matching scheme and performance of the Norwegian HAKRDANGER bridge steel box girder inside and outside were introduced. The design of coating process including surface treatment, arc spraying zinc process, spray construction process equipment and related technical parameters requirements were introduced in detail.%介绍了挪威HAKRDANGER大桥钢箱梁内外侧防腐配套方案及性能。着重介绍了涂装工艺设计,包括表面处理、电弧喷锌工艺、喷漆施工等工艺设备及相关技术参数要求等。

  6. Combustion chemical vapor desposited coatings for thermal barrier coating systems

    Energy Technology Data Exchange (ETDEWEB)

    Hampikian, J.M.; Carter, W.B. [Georgia Institute of Technology, Atlanta, GA (United States)

    1995-10-01

    The new deposition process, combustion chemical vapor deposition, shows a great deal of promise in the area of thermal barrier coating systems. This technique produces dense, adherent coatings, and does not require a reaction chamber. Coatings can therefore be applied in the open atmosphere. The process is potentially suitable for producing high quality CVD coatings for use as interlayers between the bond coat and thermal barrier coating, and/or as overlayers, on top of thermal barrier coatings.

  7. Mechanism of (NH{sub 4})S{sub 2}O{sub 8} to enhance the anti-corrosion performance of Mo-Ce inhibitor on X80 steel in acid solution

    Energy Technology Data Exchange (ETDEWEB)

    Zhu, Yanhua [School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500 (China); Zhuang, Jia, E-mail: zj-656@163.com [School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500 (China); Zeng, Xianguang [Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000 (China); Institute of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000 (China)

    2014-09-15

    Highlights: • The 1000 mg/L Na{sub 2}MoO{sub 4} and 500 mg/L Ce(NO{sub 3}){sub 3} has best synergistic effect. • The (NH{sub 4}){sub 2}S{sub 2}O{sub 8} made the valence transformation of cerium (Ce{sup 3+} → Ce{sup 4+}) come true. • The anti-corrosion performance of Mo-Ce inhibitor was improved by (NH{sub 4}){sub 2}S{sub 2}O{sub 8}. • The coordination ability of inhibitor complexes was improved by (NH{sub 4}){sub 2}S{sub 2}O{sub 8}. • The bonding force and adsorption between inhibitor and steel surface was enhanced. - Abstract: Ce(NO{sub 3}){sub 3} and Na{sub 2}MoO{sub 4} are adopted to form (Mo-Ce) composite corrosion inhibitor in allusion to the corrosion problem of steel in acidic conditions. The experimental results showed that the anticorrosion effects were enhanced and the inhibition efficiencies were increased by (NH{sub 4}){sub 2}S{sub 2}O{sub 8}. The reason of enhancement is the increase of coordination bonds amount between Ce{sup 4+} and MoO{sub 4}{sup 2−}, the augment of combining sites of interface between anti-corrosion film and steel, and the reinforce of adsorption caused by the transformation of Ce{sup 3+} to Ce{sup 4+} by oxidants. The process and conditions for transformation of Ce{sup 3+} to Ce{sup 4+} and formation of complexes are discussed. The related thermodynamic and kinetic parameters are calculated and the possibility for (NH{sub 4}){sub 2}S{sub 2}O{sub 8} to improve the performance of Mo-Ce corrosion inhibitor is proved.

  8. Bioinspired anchoring AgNPs onto micro-nanoporous TiO2 orthopedic coatings: Trap-killing of bacteria, surface-regulated osteoblast functions and host responses.

    Science.gov (United States)

    Jia, Zhaojun; Xiu, Peng; Li, Ming; Xu, Xuchen; Shi, Yuying; Cheng, Yan; Wei, Shicheng; Zheng, Yufeng; Xi, Tingfei; Cai, Hong; Liu, Zhongjun

    2016-01-01

    The therapeutic applications of silver nanoparticles (AgNPs) against biomedical device-associated infections (BAI), by local delivery, are encountered with risks of detachment, instability and nanotoxicity in physiological milieus. To firmly anchor AgNPs onto modified biomaterial surfaces through tight physicochemical interactions would potentially relieve these concerns. Herein, we present a strategy for hierarchical TiO2/Ag coating, in an attempt to endow medical titanium (Ti) with anticorrosion and antibacterial properties whilst maintaining normal biological functions. In brief, by harnessing the adhesion and reactivity of bioinspired polydopamine, silver nanoparticles were easily immobilized onto peripheral surface and incorporated into interior cavity of a micro/nanoporous TiO2 ceramic coating in situ grown from template Ti. The resulting coating protected the substrate well from corrosion and gave a sustained release of Ag(+) up to 28 d. An interesting germicidal effect, termed "trap-killing", was observed against Staphylococcus aureus strain. The multiple osteoblast responses, i.e. adherence, spreading, proliferation, and differentiation, were retained normal or promoted, via a putative surface-initiated self-regulation mechanism. After subcutaneous implantation for a month, the coated specimens elicited minimal, comparable inflammatory responses relative to the control. Moreover, this simple and safe functionalization strategy manifested a good degree of flexibility towards three-dimensional sophisticated objects. Expectedly, it can become a prospective bench to bedside solution to current challenges facing orthopedics.

  9. Excellent anti-corrosive pretreatment layer on iron substrate based on three-dimensional porous phytic acid/silane hybrid

    Science.gov (United States)

    Gao, Xiang; Lu, Ke; Xu, Lei; Xu, Hua; Lu, Haifeng; Gao, Feng; Hou, Shifeng; Ma, Houyi

    2016-01-01

    A novel, highly effective and environmentally friendly film-forming material, phytic acid (PA)/silane (denoted as PAS) hybrid with a three-dimensional (3D) network structure, was prepared through a condensation reaction of PA with methyltrihydroxysilane generated from the hydrolysis of methyltriethoxysilane (MTES). Two kinds of PAS-based pretreatment layers, namely NaBrO3-free and NaBrO3-doped PAS layers, were fabricated on iron substrates using the dip-coating method. SEM and AFM observations showed that the as-fabricated PAS-based layers possessed a 3D porous microstructure at the nanoscale and a rough surface morphology. X-ray photoelectron spectroscopic (XPS) and attenuated total reflection infrared (ATR-IR) spectroscopic characterization demonstrated that the above PAS layers bound to the iron surface via the -P-O- bond. Moreover, analyses of steady-state polarization curves and electrochemical impedance spectroscopic (EIS) data indicated that the corrosion rates of the iron substrates decreased considerably in the presence of the two PAS-based pretreatment layers. In particular, the NaBrO3-dosed PAS layer displayed the better corrosion resistance ability as well as maintaining the original microstructure and surface morphology. The PAS-based pretreatment layers are expected to act as substitutes for chromate and phosphate conversion layers and will find widespread application in the surface pretreatment of iron and steel materials due to the advantages of being environmentally friendly, the rapid film-forming process, and, especially, the nanoporous microstructure and rough surface morphology.A novel, highly effective and environmentally friendly film-forming material, phytic acid (PA)/silane (denoted as PAS) hybrid with a three-dimensional (3D) network structure, was prepared through a condensation reaction of PA with methyltrihydroxysilane generated from the hydrolysis of methyltriethoxysilane (MTES). Two kinds of PAS-based pretreatment layers, namely Na

  10. Electrospark deposition coatings

    Science.gov (United States)

    Sheely, W. F.

    1986-11-01

    Hard surfacing for wear resistant and low-friction coatings has been improved by means of advances in the computer controls in electronic circuitry of the electrospark deposition (ESD) process. coatings of nearly any electrically conductive metal alloy or cermet can be deposited on conductive materials. Thickness is usually two mils or less, but can be as high as 10 mils. ESD coatings can quadrupole cutting tool life.

  11. Oxide coating development

    Energy Technology Data Exchange (ETDEWEB)

    Stinton, D.P.

    1995-06-01

    Monolithic SiC heat exchangers and fiber-reinforced SiC-matrix composite heat exchangers and filters are susceptible to corrosion by alkali metals at elevated temperatures. Protective coatings are currently being developed to isolate the SiC materials from the corrodants. Unfortunately, these coatings typically crack and spall when applied to SiC substrates. The purpose of this task is to determine the feasibility of using a compliant material between the protective coating and the substrate. The low-modulus compliant layer could absorb stresses and eliminate cracking and spalling of the protective coatings.

  12. Superhard Nanocomposite Coatings

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The recent development in the field of nanocomposite coatings with good mechanical properties is critically reviewed in this paper. The design principle and materials selection for the nanocomposite coatings are introduced. Different methods for the preparation of superhard nanocomposite coatings are described with emphasis on the magnetron sputtering. Based on recent theoretical and experimental results regarding the appearance of superhardness in nanocomposite coating, lattice parameter changes, crystallite size, microstructure and morphology are reviewed in detail. Also emphasized are the mechanical properties (especially on hardness) and the ways by which the properties are derived.

  13. Anti-corrosion Lining of Wet Stack in the FGD System of Coal-ifred Power Plant%燃煤火力电厂烟气脱硫系统湿烟囱防腐内衬概述

    Institute of Scientific and Technical Information of China (English)

    欧阳明辉; 刘焕安; 叶际宣

    2014-01-01

    The corrosion in wet stack was analyzed and discussed. The corrosion in wet stack is a muti-phase(gas, liquid and solid etc) effected corrosion. The common used anti-corrosion linings such as glass flake, FRP, borosilicate foamed glass block and metals were characterized and analyzed. From the LCC index point of view, metals are the long life and cost-effective anti-corrosion lining of wet stack.%本文分析和讨论了湿烟囱的腐蚀特性,指出湿烟囱的腐蚀是气体、液体、固体等多相作用下的腐蚀。介绍和分析了常用的湿烟囱防腐内衬玻璃鳞片、玻璃钢、泡沫玻璃砖以及金属材料,从LCC的指标来说,金属材料是长效且经济的湿烟囱防腐内衬。

  14. Combustion chemical vapor deposited coatings for thermal barrier coating systems

    Energy Technology Data Exchange (ETDEWEB)

    Hampikian, J.M.; Carter, W.B. [Georgia Institute of Technology, Atlanta, GA (United States). School of Materials Science and Engineering

    1995-12-31

    The new deposition process, combustion chemical vapor deposition, shows a great deal of promise in the area of thermal barrier coating systems. This technique produces dense, adherent coatings, and does not require a reaction chamber. Coatings can therefore be applied in the open atmosphere. The process is potentially suitable for producing high quality CVD coatings for use as interlayers between the bond coat and thermal barrier coating, and/or as overlayers, on top of thermal barrier coatings. In this report, the evaluation of alumina and ceria coatings on a nickel-chromium alloy is described.

  15. Coated electroactive materials

    Energy Technology Data Exchange (ETDEWEB)

    Amine, Khalil; Abouimrane, Ali

    2016-08-30

    A process includes suspending an electroactive material in a solvent, suspending or dissolving a carbon precursor in the solvent; and depositing the carbon precursor on the electroactive material to form a carbon-coated electroactive material. Compositions include a graphene-coated electroactive material prepared from a solution phase mixture or suspension of an electroactive material and graphene, graphene oxide, or a mixture thereof.

  16. Rock-hard coatings

    NARCIS (Netherlands)

    Muller, M.

    2007-01-01

    Aircraft jet engines have to be able to withstand infernal conditions. Extreme heat and bitter cold tax coatings to the limit. Materials expert Dr Ir. Wim Sloof fits atoms together to develop rock-hard coatings. The latest invention in this field is known as ceramic matrix composites. Sloof has sign

  17. Coating of graphene

    NARCIS (Netherlands)

    Schneider, G.F.; Dekker, C.

    2014-01-01

    The present invention is in the field of highly crystalline graphene and coating said graphene with a layer. Said graphene may have further structures, such as nanopores, nanogaps, and nanoribbons. The coated graphene can be used for biomolecular analysis and modification, such as DNA-sequencing, as

  18. Mechanically Invisible Polymer Coatings

    DEFF Research Database (Denmark)

    2014-01-01

    phase comprises particles, said particles comprising a filler material and an encapsulating coating of a second polymeric material, wherein the backbones of the first and second polymeric materials are the same. The composition may be used in electroactive polymers (EAPs) in order to obtain mechanically...... invisible polymer coatings....

  19. Chinese Decorative Coatings Market

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Growth prospects The Chinese market for decorative coatings, excluding non-architectural products such as industrial varnishes,marine paint and other industrially applied coatings, has been growing byaround 10% annually and was estimated to be worth Eurol.3 billion a year, with an annual per capita consumption of just less than 1 liter ofpaint.

  20. Nanostructured Protective Coatings

    Science.gov (United States)

    2006-01-01

    stresses induce strain fatigue with subsequent formation of cracks. Cracking in coatings leads to materials failure observed physically as spallation or...elevated temperatures. In this test a hole is drilled into the substrate before coating it. This allows a fixed amount of air to be trapped at the

  1. Composite coating with synergistic effect of biomimetic epoxy thermoset morphology and incorporated superhydrophobic silica for corrosion protection

    Directory of Open Access Journals (Sweden)

    W. F. Ji

    2016-11-01

    Full Text Available In this work, potential anticorrosive coating resulted from the composite with synergistic effect of biomimetic epoxy thermoset (BET morphology and incorporated superhydrophobic silica microspheres was presented. First of all, superhydrophobic methyl-modified silica (MS microspheres were synthesized by performing the conventional base-catalyzed sol-gel process of MTMS and APTMS. The as-prepared MS microspheres were identified as having an average particle size of ~1 µm in diameter. The as-prepared MS microspheres were characterized by Fourier transform infrared spectrometry (FTIR, 29Si and 13C solid-state nuclear magnetic resonance (NMR spectroscopy. Morphological properties of MS microspheres and BET-silica composite coating were studied by scanning electron microscopy (SEM. Subsequently, 3 wt% of MS microspheres were incorporated into an epoxy slurry of DGEBA/T-403 in dimetyl acetamide (DMAc, followed by performing the programmed heating through nanocasting technique with PDMS as soft template materials for pattern transfer by using leaf of Xanthosoma Sagittifolium as natural template, leading to the formation of artificial biomimetic composite coating. The appearance/dispersion capability of silica microspheres in BET coating was confirmed by the energy dispersive X-ray spectroscopy (EDX and Si-mapping. The roughness level of BET and BEC-3% were detected by AFM. The BETsilica composite was found to exhibit a contact angle (CA of ~153°, revealing the synergistic effect of biomimetic epoxy morphology and incorporated superhydrophobic MS microspheres, which is found to be more hydrophobic than that of neat epoxy thermoset (CA = 81°. Corrosion protection of as-prepared coatings was demonstrated by performing a series of electrochemical measurements (Tafel, Nyquists and Bode plots upon CRS electrodes in saline condition. It should be noted that the BET coatings upon CRS electrode revealed an effectively enhanced corrosion protection as compared

  2. Heavy-duty automotive aluminum tank anti-corrosion film%重型汽车铝水箱的防腐蚀成膜研究

    Institute of Scientific and Technical Information of China (English)

    王庆国; 白培谦

    2012-01-01

    This paper investigates and analyzes the Shaanxi Auto heavy truck aluminum tank corrosion leakage, through the experimental analysis of aluminum alloy corrosion inhibitor in different, to promote the film-forming agent, pH, and other conditions, as well as a variety of membranes in the salt spray, salt watercorrosion test under the soaking conditions. The results showed that: in acidic solution, molybdate is satisfied that good inhibition of aluminum corrosion inhibition mechanism of the radical ion adsorbed on the surface of the aluminum to prevent the dissolution of the aluminum, play a protective role. In addition, molybdate weak oxidants, aluminum reduction in acid solution, to generate dark blue molybdenum blue, molybdenum blue also adsorbed onto the aluminum surface, thus inhibiting the anodic reaction [1]; its anti-corrosion effect, the aluminum tank leaking prevention and treatment provides a viable solution.%本文调查分析了陕汽重卡铝水箱腐蚀渗漏情况,通过实验分析了铝合金在不同缓蚀剂、促进剂、pH值等条件下的成膜情况,以及各种膜在盐雾、盐水浸泡等条件下的腐蚀实验。结果表明:在酸性溶液中,钼酸纳对铝有着良好的缓蚀作用,其缓蚀机理主要是酸根离子会吸附在铝的表面,阻止了铝的溶解,起到保护的作用。另外钼酸盐是弱氧化剂,在酸溶液中被铝还原,生成深蓝色的钼蓝,钼蓝也会吸附到铝的表面,从而抑制阳极反应[1];其防腐效果明显,给铝水箱漏水防治提供了可行方案。

  3. Preparation of Organic Phosphate Modified Styrene-Acrylate Grafted Epoxy Resins Latex and Its Anti-Corrosion Property%磷酸酯改性苯丙接枝环氧树脂胶乳的制备及其防腐蚀性能

    Institute of Scientific and Technical Information of China (English)

    毛正和; 钟涛; 朱爱萍; 夏中高; 杨芳芳

    2012-01-01

    采用乳液聚合方法制备了一种用于水性金属防腐蚀涂料的磷酸酯改性苯丙接枝环氧树脂胶乳,其中环氧树脂占胶乳固体含量30%,磷酸酯占胶乳固体含量1.2%.制备的胶乳可室温交联固化.采用透射电镜表征了胶乳的形貌,红外光谱表征胶乳的结构,偏光显微镜研究金属的闪锈行为,拉开法测定附着力.结果表明:胶乳粒子呈现规则的球型形貌,粒径为130 ~ 150 nm,粒径分布均匀;磷酸酯以共价键的方式连接在苯丙接枝环氧树脂胶乳中;胶乳具有优异的防闪锈性,干/湿附着力优异,同时乳胶膜具有优异的机械力学性能、耐盐水性能以及防腐蚀性能.%Emulsion polymerization was used to prepare the organic phosphate modified styrene — acrylate grafted epoxy resins latex for preparation of the waterborne metal anticorrosive coatings, in which epoxy resin content was 30% and organic phosphate content was 1.2%. The resulting latex could be crosslinked at room temperature. The latex morphology was characterized with TEM; the structure was measured with FT - IR; the flash rust behaviors on metals were studied with the polarizing microscope; and the adhesion was measured with the pull - off method. The results indicated that the latex particles showed regular spheroidal morphology, with 130-150 nm in diameter and uniform particle size distribution; the organic phosphate linked with styrene - acrylate grafted epoxy resins latex by covalent bond; the latex was excellent in flash rust resistance and drying/wet adhesion. And the latex film could provide good mechanical properties, salt water resistance and anti - corrosion property.

  4. Antibacterial inorganic-organic hybrid coatings on stainless steel via consecutive surface-initiated atom transfer radical polymerization for biocorrosion prevention.

    Science.gov (United States)

    Yuan, S J; Pehkonen, S O; Ting, Y P; Neoh, K G; Kang, E T

    2010-05-04

    To enhance the corrosion resistance of stainless steel (SS) and to impart its surface with antibacterial functionality for inhibiting biofilm formation and biocorrosion, well-defined inorganic-organic hybrid coatings, consisting of a polysilsesquioxane inner layer and quaternized poly(2-(dimethyamino)ethyl methacrylate) (P(DMAEMA)) outer blocks, were prepared via successive surface-initiated atom transfer radical polymerization (ATRP) of 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). The cross-linked P(TMASPMA), or polysilsesquioxane, inner layer provided a durable and resistant coating to electrolytes. The pendant tertiary amino groups of the P(DMAEMA) outer block were quaternized with alkyl halide to produce a high concentration of quaternary ammonium groups with biocidal functionality. The so-synthesized inorganic-organic hybrid coatings on the SS substrates exhibited good anticorrosion and antibacterial effects and inhibited biocorrosion induced by sulfate-reducing bacteria (SRB) in seawater media, as revealed by antibacterial assay and electrochemical analyses, and they are potentially useful to steel-based equipment under harsh industrial and marine environments.

  5. Phenol-formaldehyde intumescent coating composition and coating prepared therefrom

    Science.gov (United States)

    Salyer, Ival O. (Inventor); Fox, Bernard L. (Inventor)

    1986-01-01

    Intumescent coatings which form a thick, uniform, fine celled, low density foam upon exposure to a high intensity heat flux or flame are disclosed, the invention coatings comprise phenolic resin prepolymer containing a blowing agent and a nucleating agent; in the preferred embodiments the coatings also contains a silicone surfactant, the coatings are useful in thermal and fire protection systems.

  6. Fluorine Based Superhydrophobic Coatings

    Directory of Open Access Journals (Sweden)

    Jean-Denis Brassard

    2012-05-01

    Full Text Available Superhydrophobic coatings, inspired by nature, are an emerging technology. These water repellent coatings can be used as solutions for corrosion, biofouling and even water and air drag reduction applications. In this work, synthesis of monodispersive silica nanoparticles of ~120 nm diameter has been realized via Stöber process and further functionalized using fluoroalkylsilane (FAS-17 molecules to incorporate the fluorinated groups with the silica nanoparticles in an ethanolic solution. The synthesized fluorinated silica nanoparticles have been spin coated on flat aluminum alloy, silicon and glass substrates. Functionalization of silica nanoparticles with fluorinated groups has been confirmed by Fourier Transform Infrared spectroscopy (FTIR by showing the presence of C-F and Si-O-Si bonds. The water contact angles and surface roughness increase with the number of spin-coated thin films layers. The critical size of ~119 nm renders aluminum surface superhydrophobic with three layers of coating using as-prepared nanoparticle suspended solution. On the other hand, seven layers are required for a 50 vol.% diluted solution to achieve superhydrophobicity. In both the cases, water contact angles were more than 150°, contact angle hysteresis was less than 2° having a critical roughness value of ~0.700 µm. The fluorinated silica nanoparticle coated surfaces are also transparent and can be used as paint additives to obtain transparent coatings.

  7. 钛白冷冻结晶罐钛材包覆搅拌器的应用技术%Application of Titanium Coated Agitator in Freezing and Crystallization Vessels for Titanium Dioxide

    Institute of Scientific and Technical Information of China (English)

    夏步前

    2001-01-01

    本文探讨了钛材在钛白冷冻结晶罐中防腐蚀的机理,提出了钛材用作防腐蚀层的搅拌包覆层的结构设计,制造技术及成本和可靠性分析。%The anticorrosion mechanism of titanium naterial in the freezingand crystallization vessels for titanium dioxide was discussed in this article.The structural design of using titanium as the coated layer to protect corrosion for the agitator,the fabrication thechnique and the method for the cost analysis and reliability analysis were also introduced.

  8. KY-2缓蚀剂的研制及在中原油田的应用%The Study of KY-2 Anti-corrosive Agent and Application in Zhongyuan Oil Field

    Institute of Scientific and Technical Information of China (English)

    刘生福; 丁其杰

    2013-01-01

    It is about water’s corrosion from Zhongyuan production system. According to the situation that anti-corrosive is good at oil-soluble but bad at inhibition of corrosion. We composed five kinds of water-soluble and oil-microsoluble anti-corrosive agent in lab. In this paper, The corrosion inhibitor KY-2 ware synthesied with oleic acids, diethylenetriamine and other materials and It shows good corrosion protection property to sour sewage in oil fields. The chemical structural formula of corrosion inhibitor KY-2 ware studied by infrared spectrogram. The corrosion inhibition performance were investigated by weight-loss measurement and electrochemical polarization curves. When the cocentration of corrosion inhibitor is 100 mg/L, the corrosion protection rate is about 90%, and the corrosion rate is less than 0.076 mm/a, the iron ion in the production water and times for corrosive well repair was reduced. After KY-2 used a significant economic effect and anti-corrosion effect is good, and application prospect is good.%  要:通过中原油田生产系统产出液的腐蚀性调查,以油酸、二乙烯三胺和二甲苯为原料,通过合成、复配与评价试验,室内合成了适用于中原油田油井产出液的缓蚀剂KY-2.应用静态、动态挂片,电化学极化曲线评价其缓蚀性能及缓蚀机理.自2009年中原油田六个采油厂的现场应用表明,KY-2缓蚀剂的加入量在100mg/L时,腐蚀速率明显降低,其缓蚀效果可达90%左右,平均静态腐蚀速率小于0.076mm/a,并且总铁降低,趟井次数降低,经济效果显著,防腐效果良好,具有较好的推广应用前景.

  9. Advanced thermal barrier coating systems

    Science.gov (United States)

    Dorfman, M. R.; Reardon, J. D.

    1985-01-01

    Current state-of-the-art thermal barrier coating (TBC) systems consist of partially stabilized zirconia coatings plasma sprayed over a MCrAlY bond coat. Although these systems have excellent thermal shock properties, they have shown themselves to be deficient for a number of diesel and aircraft applications. Two ternary ceramic plasma coatings are discussed with respect to their possible use in TBC systems. Zirconia-ceria-yttria (ZCY) coatings were developed with low thermal conductivities, good thermal shock resistance and improved resistance to vanadium containing environments, when compared to the baseline yttria stabilized zirconia (YSZ) coatings. In addition, dense zirconia-titania-yttria (ZTY) coatings were developed with particle erosion resistance exceeding conventional stabilized zirconia coatings. Both coatings were evaluated in conjunction with a NiCr-Al-Co-Y2O3 bond coat. Also, multilayer or hybrid coatings consisting of the bond coat with subsequent coatings of zirconia-ceria-yttria and zirconia-titania-yttria were evaluated. These coatings combine the enhanced performance characteristics of ZCY with the improved erosion resistance of ZTY coatings. Improvement in the erosion resistance of the TBC system should result in a more consistent delta T gradient during service. Economically, this may also translate into increased component life simply because the coating lasts longer.

  10. Aluminum phosphate coatings

    Science.gov (United States)

    Sambasivan, Sankar; Steiner, Kimberly A.; Rangan, Krishnaswamy K.

    2007-12-25

    Aluminophosphate compounds and compositions as can be used for substrate or composite films and coating to provide or enhance, without limitation, planarization, anti-biofouling and/or anti-microbial properties.

  11. Inorganic Coatings Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — The inorganic Coatings Lab provides expertise to Navy and Joint Service platforms acquisition IPTs to aid in materials and processing choices which balance up-front...

  12. Friction surfaced Stellite6 coatings

    Energy Technology Data Exchange (ETDEWEB)

    Rao, K. Prasad; Damodaram, R. [Department of Metallurgical and Materials Engineering - Indian Institute of Technology Madras, Chennai 600 036 (India); Rafi, H. Khalid, E-mail: khalidrafi@gmail.com [Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036 (India); Ram, G.D. Janaki [Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036 (India); Reddy, G. Madhusudhan [Metal Joining Group, Defence Metallurgical Research Laboratory (DMRL) Kanchanbagh, Hyderabad 500 058 (India); Nagalakshmi, R. [Welding Research Institute, Bharat Heavy Electricals Limited, Tiruchirappalli 620 014 (India)

    2012-08-15

    Solid state Stellite6 coatings were deposited on steel substrate by friction surfacing and compared with Stellite6 cast rod and coatings deposited by gas tungsten arc and plasma transferred arc welding processes. Friction surfaced coatings exhibited finer and uniformly distributed carbides and were characterized by the absence of solidification structure and compositional homogeneity compared to cast rod, gas tungsten arc and plasma transferred coatings. Friction surfaced coating showed relatively higher hardness. X-ray diffraction of samples showed only face centered cubic Co peaks while cold worked coating showed hexagonally close packed Co also. - Highlights: Black-Right-Pointing-Pointer Stellite6 used as coating material for friction surfacing. Black-Right-Pointing-Pointer Friction surfaced (FS) coatings compared with casting, GTA and PTA processes. Black-Right-Pointing-Pointer Finer and uniformly distributed carbides in friction surfaced coatings. Black-Right-Pointing-Pointer Absence of melting results compositional homogeneity in FS Stellite6 coatings.

  13. Nanostructured Superhydrophobic Coatings

    Energy Technology Data Exchange (ETDEWEB)

    None

    2009-03-01

    This factsheet describes a research project that deals with the nanostructured superhydrophobic (SH) powders developed at ORNL. This project seeks to (1) improve powder quality; (2) identify binders for plastics, fiberglass, metal (steel being the first priority), wood, and other products such as rubber and shingles; (3) test the coated product for coating quality and durability under operating conditions; and (4) application testing and production of powders in quantity.

  14. Spin coating apparatus

    Science.gov (United States)

    Torczynski, John R.

    2000-01-01

    A spin coating apparatus requires less cleanroom air flow than prior spin coating apparatus to minimize cleanroom contamination. A shaped exhaust duct from the spin coater maintains process quality while requiring reduced cleanroom air flow. The exhaust duct can decrease in cross section as it extends from the wafer, minimizing eddy formation. The exhaust duct can conform to entrainment streamlines to minimize eddy formation and reduce interprocess contamination at minimal cleanroom air flow rates.

  15. Coated 4340 Steel

    Science.gov (United States)

    2013-08-26

    alternative coatings qualified to MIL-PRE-23377 Class N and an electroplated zinc - nickel alloy passivated with a trivalent chromium solution which is...effect of a non-chromate primer and zinc - nickel plating with non-chromate passivation as alternatives to the chromate primer and cadmium plating with...NAWCADPAX/TR-2013/252 COATED 4340 STEEL by E. U. Lee C. Lei M. Stanley B. Pregger C. Matzdorf 26 August 2013

  16. Residual stresses within sprayed coatings

    Institute of Scientific and Technical Information of China (English)

    JIANG Yi; XU Bin-shi; WANG Hai-dou

    2005-01-01

    Some important developments of residual stress researches for coating-based systems were studied. The following topics were included the sources of residual stresses in coatings: error analysis of Stoney's equation in the curvature method used for the measurement of coating residual stress, the modeling of residual stress and some analytical models for predicting the residual stresses in coatings. These topics should provide some important insights for the fail-safe design of the coating-based systems.

  17. Hydroxyapatite coatings for biomedical applications

    CERN Document Server

    Zhang, Sam

    2013-01-01

    Hydroxyapatite coatings are of great importance in the biological and biomedical coatings fields, especially in the current era of nanotechnology and bioapplications. With a bonelike structure that promotes osseointegration, hydroxyapatite coating can be applied to otherwise bioinactive implants to make their surface bioactive, thus achieving faster healing and recovery. In addition to applications in orthopedic and dental implants, this coating can also be used in drug delivery. Hydroxyapatite Coatings for Biomedical Applications explores developments in the processing and property characteri

  18. Biocompatibility of Niobium Coatings

    Directory of Open Access Journals (Sweden)

    René Olivares-Navarrete

    2011-09-01

    Full Text Available Niobium coatings deposited by magnetron sputtering were evaluated as a possible surface modification for stainless steel (SS substrates in biomedical implants. The Nb coatings were deposited on 15 mm diameter stainless steel substrates having an average surface roughness of 2 mm. To evaluate the biocompatibility of the coatings three different in vitro tests, using human alveolar bone derived cells, were performed: cellular adhesion, proliferation and viability. Stainless steel substrates and tissue culture plastic were also studied, in order to give comparative information. No toxic response was observed for any of the surfaces, indicating that the Nb coatings act as a biocompatible, bioinert material. Cell morphology was also studied by immune-fluorescence and the results confirmed the healthy state of the cells on the Nb surface. X-ray diffraction analysis of the coating shows that the film is polycrystalline with a body centered cubic structure. The surface composition and corrosion resistance of both the substrate and the Nb coating were also studied by X-ray photoelectron spectroscopy and potentiodynamic tests. Water contact angle measurements showed that the Nb surface is more hydrophobic than the SS substrate.

  19. Application of Bridge Comprehensive Anti-corrosion Technology in Coastal Saline Areas%桥梁综合防腐技术在滨海盐碱地区的应用

    Institute of Scientific and Technical Information of China (English)

    李贤松

    2012-01-01

    滨海盐碱地区混凝土结构的腐蚀破坏严重影响桥梁的使用寿命和运营安全,通过对混凝土腐蚀机理进行分析,并结合工程实例,对桥梁综合防腐技术进行介绍和探讨。%The corrosion damage of concrete structures in coastal saline areas seriously affect the service life and operational safety of the bridge. After an analysis of the mechanism of concrete corrosion, this paper presnets and discusses the bridge comprehensive anti-corrosion technology in connection with real engineering cases.

  20. 曼尼希碱的结构与其缓蚀性能的关系%The relationship between the structures of Mannich bases and the anti-corrosion performances

    Institute of Scientific and Technical Information of China (English)

    战风涛; 丁鹏鹏; 吕志凤; 高统海; 周昕媛

    2016-01-01

    利用曼尼希反应制得了曼尼希碱1-苯基-3-二乙氨基-1-丙酮( DPO),再利用DPO和伯胺(苄胺、对甲基苯胺、苯胺)进行胺交换反应,制得了结构不同的曼尼希碱:1-苯基-3-苄氨基-1-丙酮( BPO )、1-苯基-3-对甲苯氨基-1-丙酮( TPO)和1-苯基-3-苯氨基-1-丙酮( PPO)。静态失重法和极化曲线法研究结果表明,其在15%盐酸中90℃时对N80钢的缓蚀性能大小顺序为:DPO<BPO<TPO<PPO。四种曼尼希碱缓蚀剂在N80钢表面上的吸附遵循Langmuir吸附模型,吸附能力大小顺序为:DPO<BPO<TPO<PPO,这说明当曼尼希碱分子中氨基与苯环形成富电子共轭体系时,其吸附能力较强,可表现出较强的缓蚀性能。%Mannich bases,3-diethylamino-1-phenylpropan-1-one (DPO),was prepared by Mannich reac-tion.Mannich bases , 3-benzylamino-1-phenylpropan-1-one ( BPO ) , 3-p-toluidino-1-phenylpropan-1-one (TPO) and 3-phenylamino-1-phenylpropan-1-one (PPO),were prepared by amine exchange reactions between DPO and primary amines ( benzylamine , p-toluidine and aniline ) .The anti-corrosion perform-ances of the four Mannich bases as inhibitors in 15%hydrochloric acid at 90℃were investigated by stat-ic gravimetric measurement and the polarization curves method .The four Mannich bases can be arranged ( in order of increasing anti-corrosion performance ):DPOanti-corrosion performance .These results showed that the Mannich bases could present preferable anti-corrosion performance when the conjugated system with rich electrons was formed between amino and phenyl in the Mannich bases .

  1. DR/2010型分光光度计在防腐分析技术上的应用%The Type of DR/2010 Spectrophotometer Using in Anticorrosion Analysis

    Institute of Scientific and Technical Information of China (English)

    黄彩容

    2012-01-01

    Detailed introduction Production Device Monitor Center of the new development three anticorrosive analysis of project: iron ion,chloride ion,sulfur ion new method for the determination of and the type of 2010 spectrophotometer performance.The facts proved that the three new methods were most suitable analysis methods for analysis sulfur wate water.%详细介绍了茂名石化生产设备监测中心新开发的3个防腐分析项目:铁离子、氯离子、硫离子测定的新方法以及DR/2010型分光光度计的性能。事实证明,这3个新方法是目前众多分析方法中最适合分析含硫污水的分析方法。

  2. Controlled Thermal Expansion Coat for Thermal Barrier Coatings

    Science.gov (United States)

    Brindley, William J. (Inventor); Miller, Robert A. (Inventor); Aikin, Beverly J. M. (Inventor)

    1999-01-01

    A improved thermal barrier coating and method for producing and applying such is disclosed herein. The thermal barrier coating includes a high temperature substrate, a first bond coat layer applied to the substrate of MCrAlX, and a second bond coat layer of MCrAlX with particles of a particulate dispersed throughout the MCrAlX and the preferred particulate is Al2O3. The particles of the particulate dispersed throughout the second bond coat layer preferably have a diameter of less then the height of the peaks of the second bond coat layer, or a diameter of less than 5 microns. The method of producing the second bond coat layer may either include the steps of mechanical alloying of particles throughout the second bond coat layer, attrition milling the particles of the particulate throughout the second bond coat layer, or using electrophoresis to disperse the particles throughout the second bond coat layer. In the preferred embodiment of the invention, the first bond coat layer is applied to the substrate, and then the second bond coat layer is thermally sprayed onto the first bond coat layer. Further, in a preferred embodiment of die invention, a ceramic insulating layer covers the second bond coat layer.

  3. SCR脱硝空预器防腐及柔性接触密封改造%Anticorrosion and Flexible Contact Seal Transformation of the SCR Denitration Air Heater

    Institute of Scientific and Technical Information of China (English)

    欧阳葵

    2014-01-01

    After using SCR denitration in thermal power enterprises, low temperature corrosion will also occur on rotary air heater. In this paper the rotary air heater corrosion protection technology reform measures are studied, the principle and characteristics of flexible contact seal technology are analyzed, the modification of air heater anticor-rosion and the air leakage reduction is completed, and the seal transformation efficiency analysis is conducted. The running results show that prevent anticorrosion and flexible contact seal modification can prevent the corrosion at low temperature, reduce the air leakage in air heater, and obtain remarkable economic and social benefits.%火力发电企业在采用SCR脱硝后,回转式空预器也会发生低温腐蚀。研究了回转式空预器防腐改造技术措施,分析了柔性接触式密封技术的原理及特点,进行了空预器防腐及减小漏风改造,并进行了密封改造的效益分析。运行结果表明,经过防腐及柔性接触式密封改造后,可防止低温腐蚀,且大幅度降低空气预热器漏风,获得较显著的经济效益和社会效益。

  4. Effect of Coated PHB on Properties of Abradable Seal Coating

    Institute of Scientific and Technical Information of China (English)

    CHENG Xudong; XIANG Hongyu; YE Weiping; MENG Xiaoming; MIN Jie; LIU Minzhi; ZHANG Pu; LU Wei

    2014-01-01

    As pore-forming materials, the coated poly-p-hydroxybenzoate(short for PHB) and h-BN can be applied in the preparation of abradable seal coatings at high temperature. The characteristics of coating such as morphology, thermal stability and composition were studied by SEM, EDS and FTIR. The results show that the modified PHB will change the remained carbon amount, porosity and pore morphology of the coating, which can affect the properties of coatings. If the pore is small enough in uniform distribution, the coating with 5 MPa bond strength, 30-55 HR45Y superficial hardness and certain of carbon can be suitable to well abradability.

  5. Coatings for directional eutectics

    Science.gov (United States)

    Rairden, J. R.; Jackson, M. R.

    1976-01-01

    Coatings developed to provide oxidation protection for the directionally-solidified eutectic alloy NiTaC-B (4.4 weight percent Cr) were evaluated. Of seven Co-, Fe- and Ni-base coatings that were initially investigated, best resistance to cyclic oxidation was demonstrated by duplex coatings fabricated by depositing a layer of NiCrAl(Y) by vacuum evaporation from an electron beam source followed by deposition of an Al overlayer using the pack cementation process. It was found that addition of carbon to the coating alloy substantially eliminated the problem of fiber denudation in TaC-type eutectic alloys. Burner rig cycled NiTaC-B samples coated with Ni-20Cr-5Al-0.1C-0.1Y+Al and rupture-tested at 1100 deg C performed as well as or better than uncoated, vacuum cycled and air-tested NiTaC-13; however, a slight degradation with respect to uncoated material was noted in air-stress rupture tests at 870 deg C for both cycled and uncycled samples.

  6. Based Adaptive Nanocomposite Coatings

    Science.gov (United States)

    Ramazani, M.; Ashrafizadeh, F.; Mozaffarinia, R.

    2014-08-01

    A promising Ni(Al)-Cr2O3-Ag-CNT-WS2 self-lubricating wear-resistant coating was deposited via atmospheric plasma spray of Ni(Al), nano Cr2O3, nano silver and nano WS2 powders, and CNTs. Feedstock powders with various compositions prepared by spray drying were plasma sprayed onto carbon steel substrates. The tribological properties of coatings were tested by a high temperature tribometer in a dry environment from room temperature to 400 °C, and in a natural humid environment at room temperature. It was found that all nanocomposite coatings have better frictional behavior compared with pure Ni(Al) and Ni(Al)-Cr2O3 coatings; the specimen containing aproximately 7 vol.% Ag, CNT, and WS2 had the best frictional performance. The average room temperature friction coefficient of this coating was 0.36 in humid atmosphere, 0.32 in dry atmosphere, and about 0.3 at high temperature.

  7. Tribology and coatings

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-06-01

    The future use of fuel-efficient, low-emission, advanced transportation systems (for example, those using low-heat-rejection diesel engines or advanced gas turbines) presents new challenges to tribologists and materials scientists. High service temperatures, corrosive environments, and extreme contact pressures are among the concerns that make necessary new tribological designs, novel materials, and effective lubrication concepts. Argonne is working on methods to reduce friction, wear and corrosion, such as soft metal coatings on ceramics, layered compounds, diamond coatings, and hard surfaces.

  8. HA-Coated Implant

    DEFF Research Database (Denmark)

    Daugaard, Henrik; Søballe, Kjeld; Bechtold, Joan E

    2014-01-01

    The goal of osseointegration of orthopedic and dental implants is the rapid achievement of a mechanically stable and long lasting fixation between living bone and the implant surface. In total joint replacements of cementless designs, coatings of calcium phosphates were introduced as a means...... of improving the fixation of implants. Of these, hydroxyapatite (HA) is the most widely used and most extensively investigated. HA is highly osseoconductive, and the positive effect is well documented in both basic and long-term clinical research [1–6]. This chapter describes experimental and clinical studies...... evaluating bone-implant fixation with HA coatings....

  9. Bioceramics for implant coatings

    Directory of Open Access Journals (Sweden)

    Allison A Campbell

    2003-11-01

    Early research in this field focused on understanding the biomechanical properties of metal implants, but recent work has turned toward improving the biological properties of these devices. This has led to the introduction of calcium phosphate (CaP bioceramics as a bioactive interface between the bulk metal impart and the surrounding tissue. The first CaP coatings were produced via vapor phase processes, but more recently solution-based and biomimetic methods have emerged. While each approach has its own intrinsic materials and biological properties, in general CaP coatings promise to improve implant biocompatibility and ultimately implant longevity.

  10. Advanced Coating Removal Techniques

    Science.gov (United States)

    Seibert, Jon

    2006-01-01

    An important step in the repair and protection against corrosion damage is the safe removal of the oxidation and protective coatings without further damaging the integrity of the substrate. Two such methods that are proving to be safe and effective in this task are liquid nitrogen and laser removal operations. Laser technology used for the removal of protective coatings is currently being researched and implemented in various areas of the aerospace industry. Delivering thousands of focused energy pulses, the laser ablates the coating surface by heating and dissolving the material applied to the substrate. The metal substrate will reflect the laser and redirect the energy to any remaining protective coating, thus preventing any collateral damage the substrate may suffer throughout the process. Liquid nitrogen jets are comparable to blasting with an ultra high-pressure water jet but without the residual liquid that requires collection and removal .As the liquid nitrogen reaches the surface it is transformed into gaseous nitrogen and reenters the atmosphere without any contamination to surrounding hardware. These innovative technologies simplify corrosion repair by eliminating hazardous chemicals and repetitive manual labor from the coating removal process. One very significant advantage is the reduction of particulate contamination exposure to personnel. With the removal of coatings adjacent to sensitive flight hardware, a benefit of each technique for the space program is that no contamination such as beads, water, or sanding residue is left behind when the job is finished. One primary concern is the safe removal of coatings from thin aluminum honeycomb face sheet. NASA recently conducted thermal testing on liquid nitrogen systems and found that no damage occurred on 1/6", aluminum substrates. Wright Patterson Air Force Base in conjunction with Boeing and NASA is currently testing the laser remOval technique for process qualification. Other applications of liquid

  11. Active Packaging Coatings

    Directory of Open Access Journals (Sweden)

    Luis J. Bastarrachea

    2015-11-01

    Full Text Available Active food packaging involves the packaging of foods with materials that provide an enhanced functionality, such as antimicrobial, antioxidant or biocatalytic functions. This can be achieved through the incorporation of active compounds into the matrix of the commonly used packaging materials, or by the application of coatings with the corresponding functionality through surface modification. The latter option offers the advantage of preserving the packaging materials’ bulk properties nearly intact. Herein, different coating technologies like embedding for controlled release, immobilization, layer-by-layer deposition, and photografting are explained and their potential application for active food packaging is explored and discussed.

  12. Preparation of hydrophobic coatings

    Science.gov (United States)

    Branson, Eric D.; Shah, Pratik B.; Singh, Seema; Brinker, C. Jeffrey

    2009-02-03

    A method for preparing a hydrophobic coating by preparing a precursor sol comprising a metal alkoxide, a solvent, a basic catalyst, a fluoroalkyl compound and water, depositing the precursor sol as a film onto a surface, such as a substrate or a pipe, heating, the film and exposing the film to a hydrophobic silane compound to form a hydrophobic coating with a contact angle greater than approximately 150.degree.. The contact angle of the film can be controlled by exposure to ultraviolet radiation to reduce the contact angle and subsequent exposure to a hydrophobic silane compound to increase the contact angle.

  13. Methods and means for coating paper by film coating

    NARCIS (Netherlands)

    van der Maarel, Marc; Ter Veer, Arend Berend Cornelis; Vrieling-Smit, Annet; Delnoye, Pierre

    2015-01-01

    This invention relates to the field of paper coating, more in particular to means and methods for providing paper with at least one layer of pigment using film coating to obtain a well printable surface. Provided is a method for preparing coated paper comprising the steps of: a) providing a pigmente

  14. Anti-corrosion Painting of Corroded Transmission Towers%锈蚀输电铁塔涂装体系耐蚀性

    Institute of Scientific and Technical Information of China (English)

    陈颖敏; 俞立; 侯玉婧

    2012-01-01

    The performance of phosphating solution used as pretreatment agent of corroded transmission towers was studied and the matchable coating system was developed.The results of treatment of corroded transmission towers by phosphating solution showed that in forming the process of a dense protection film of phosphate on the surface of corroded steel,the phosphating liquid cleaning,rust conversion,zinc phosphating and surface conditioning were finished at the same time.The results also showed that using organic coatings as primer,the coating system had a good performance in mechanical properties and corrosion resistance with the matchable phosphating solution.%采用磷化技术处理锈蚀输电铁塔,并在此基础上设计出与磷化液配套的防腐蚀涂装体系。试验结果表明,使用磷化技术处理锈蚀铁塔时,磷化液在锈蚀金属表面形成致密磷酸盐膜,清洗、锈层转化、锌层磷化以及表面调整可以一步完成;配制的涂装体系中,以有机涂料为底漆的涂装体系与磷化液配套使用机械性能与耐蚀性能良好。

  15. Chromate-free Passivation Technology for Electrodeposited Nickel Coating%电沉积镀镍层的无铬钝化工艺

    Institute of Scientific and Technical Information of China (English)

    堵艳艳; 潘勇; 周兆锋; 李玮; 惠建科

    2012-01-01

    采用正交试验法筛选了一种以植酸、钼酸钠和缓蚀添加剂为基本组成的无铬钝化液。通过电化学阻抗谱测试,确定了最佳成膜时间;通过5%CusO4。点滴试验、10%NaCl浸泡试验和极化曲线测试,对电沉积镀镍层无铬钝化后的耐蚀性能进行了研究。结果表明,采用本无铬钝化工艺后,镀镍层耐蚀性能良好。%In order to improve the corrosion resistance of electrodeposited nickel coating and subsititute the carcinogenic hexavalent chromium passivation, a new chromate free passivation solution was screened out by means of orthogonal analysis experiments. Fhe solution was composed of phytic acid, sodium molybdate and corrosion inhibitor. The optimal time for conversion film formation was determined by electrochemical impedance spectroscopy. The corrosion resistant properties of electrodeposited nickel coating were studied by dropping corrosion test in 5% CuSO4, immersion test in 10% NaC1 and polarization curves. The results showed that the film passivated by the technology has good anti-corrosion performance.

  16. Optical coatings for fiber lasers

    Institute of Scientific and Technical Information of China (English)

    HONG Dong-mei; ZHU Zhen; YUE Wei

    2005-01-01

    Fiber laser is the future development direction for the high energy lasers. This paper describs two kinds of optical coatings for fiber laser, including long and short wave pass filters. The one characteristic of fiber laser coatings lies in that coatings should separate two closely wavelength light including laser pump wavelength (980 nm) and laser irradiation wavelength(1 050~1 100 nm). At the same time, the coatings should have high laser damage threshold.

  17. Coatings and Tints of Spectacle Lenses

    OpenAIRE

    H. Zeki Büyükyıldız

    2012-01-01

    Spectacle lenses are made of mineral or organic (plastic) materials. Various coatings and tints are applied to the spectacle lenses according to the characteristic of the lens material, and for the personal needs and cosmetic purpose. The coatings may be classified in seven groups: 1) Anti-reflection coatings, 2) Hard coatings, 3) Clean coat, 4) Mirror coatings, 5) Color tint coating (one of coloring processes), 6) Photochromic coating (one of photochromic processes), and 7) Anti-fog...

  18. Tribological characterization of selected hard coatings

    OpenAIRE

    Karlsson, Patrik

    2009-01-01

    Hard coatings are often used for protection of tool surfaces due to coating properties like low friction and high wear resistance. Even though many of the hard coatings have been tested for wear, it is important to try new wear test setups to fully understand tribological mechanisms and the potential of hard coatings. Few experiments have been performed with dual-coated systems where the sliding contact surfaces are coated with the same, or different, hard coating. The dual-coated system coul...

  19. Structure, tribological and electrochemical properties of low friction TiAlSiCN/MoSeC coatings

    Energy Technology Data Exchange (ETDEWEB)

    Bondarev, A.V.; Kiryukhantsev-Korneev, Ph.V.; Sheveyko, A.N.; Shtansky, D.V., E-mail: shtansky@shs.misis.ru

    2015-02-01

    counterpart material. This was attributed to the presence of MoSe{sub 2} and free carbon-based phases in the tribological contact. The TiAlSiCN/MoSeC coating with a maximal amount of MoSeC also demonstrated superior tribological characteristics in distilled water (CoF ∼ 0.1) and at moderate temperatures up to 300 °C (CoF < 0.1). The electrochemical tests showed that, in general, doping with MoSeC did not negatively affect the coating electrochemical behavior. On the contrary, the MoSeC phase demonstrated small positive effect on the anti-corrosive properties of TiAlSiCN coatings under small polarizations.

  20. Chitin-based coatings

    OpenAIRE

    1995-01-01

    A chitosan starting material is combined with a dilute organic acid to produce a chitosonium ion complex. The chitosonium ion complex is then cast, sprayed, extruded, or otherwise processed to produce filaments, coatings, fibers, or the like. Heat is then used to convert the chitosonium ion complex into a N-(C.sub.1-30)acyl glucose amine polymer.

  1. ATHENA optimized coating design

    DEFF Research Database (Denmark)

    Ferreira, Desiree Della Monica; Christensen, Finn Erland; Jakobsen, Anders Clemen

    2012-01-01

    The optimization of coating design for the ATHENA mission si described and the possibility of increasing the telescope effective area in the range between 0.1 and 10 keV is investigated. An independent computation of the on-axis effective area based on the mirror design of ATHENA is performed in ...

  2. Effect of benzotriazole content on anti-corrosion propertise of protective coatings over bronze culture heritage%苯并三唑的用量对青铜文物封护剂耐蚀性能的影响

    Institute of Scientific and Technical Information of China (English)

    于淼; 许淳淳

    2004-01-01

    采用缓蚀剂苯并三唑(BTA)等对丙烯酸酯聚合物乳液进行改性,研制成青铜文物防蚀封护剂.采用浸泡试验,盐雾试验,原子吸收分光光度法等试验方法,研究BTA用量对封护剂耐蚀性能的影响.结果表明,BTA对防蚀封护剂的耐酸性、耐碱性、耐盐水性、耐水性、耐盐雾性等性能均有很大影响.

  3. 水性聚氨酯丙烯酸酯/氧化石墨烯防腐涂层的制备与性能%Preparation and Properties of Waterborne Polyurethane Acrylate/Graphene Oxide Anti-Corrosion Coating

    Institute of Scientific and Technical Information of China (English)

    费贵强; 王佼; 王海花; 朱科; 王东

    2016-01-01

    为进一步改善水性聚氨酯丙烯酸酯涂层的防腐性能,采用原位聚合法制备了系列水性聚氨酯丙烯酸酯/氧化石墨烯(WPUA/GO)复合乳液.利用X射线衍射、拉曼光谱、红外光谱表征了自制GO的结构与形貌;运用透射电镜、扫描电子显微镜分析了复合乳液的微观形貌;并通过耐盐雾试验及电化学工作站测试了涂层的防腐性能.结果表明,通过改进的Hummers法制备出氧化程度高、分散性较好的GO;WPUA/GO乳液粒径随着GO含量的增加呈现先增大后减小的趋势;当GO的质量分数为0.5%时,涂层的热稳定性提高了140℃,耐盐雾时间比纯WPUA延长了10 d,腐蚀电流密度减小了1个数量级.

  4. Optimum Seeking and Application of the Anti-corrosion Protection Coatings of Water-wall Tubes in Boilers of Electric Station%电站锅炉水冷壁腐蚀防护涂层优选和应用

    Institute of Scientific and Technical Information of China (English)

    刘谦; 马世宁; 李长青

    2003-01-01

    采用高速电弧喷涂技术制备了FeCrNi、Fe-Cr-Al、Cr-Ni、45CT涂层,并进行了抗氧化和热腐蚀试验,发现Cr-Ni涂层具有优良的防腐蚀效果.通过在天津大港电厂和邯郸电厂等锅炉水冷壁的实际应用,发现高速电弧喷涂Cr-Ni涂层加高温封孔剂涂层体系的防腐蚀效果明显,在治理热电厂锅炉水冷壁热腐蚀方面具有良好的应用前景.

  5. 闭孔珍珠岩在热反射隔热重防腐涂料中的应用%Application of Closed Cell Perlite in Reflective Thermo-Insulation Heavy-Duty Anticorrosive Coatings

    Institute of Scientific and Technical Information of China (English)

    施铭德; 刘思平; 梁基码

    2013-01-01

    根据热反射隔热原理,本配套体系采用底漆防锈防腐,中间漆隔热与热储存,面漆具有较高的反射率和持久装饰的特性,通过与膨胀珍珠岩、玻化微珠的隔热性能比较,结果表明:采用闭孔珍珠岩制得的隔热中间漆,由于其具有较低的导热系数和优异的综合性能,隔热性能和屏蔽效果较好,在石油石化防腐领域具有广泛的应用前景.

  6. Influences of New Compound Corrosion Inhibitor on Anticorrosion Performance of Waterborne Epoxy Coatings%新型缓蚀剂对水性环氧涂料防腐性能的影响

    Institute of Scientific and Technical Information of China (English)

    王晓艳; 高延敏; 孟祥玲; 缪文桦

    2009-01-01

    新型无机缓蚀剂已成为目前研究的热点.国内外对磷酸盐系缓蚀剂的缓蚀机理和缓蚀效果的研究已很充分[1-2].但该类缓蚀剂也存在一定的缺点,如颗粒较粗大,在涂料中分散性能较差等[3].为解决这一问题,现在的主要发展方向是开发出高效、低价、高性能化、高同体化、水性化、微细粉末产品[4].复合磷钛粉就是基于这一要求发展起来的一类新型缓蚀剂.本文利用极化曲线对复合磷钛粉的缓蚀机理进行了初步的探索,并通过电化学阻抗技术研究了复合磷钛粉用量对涂层耐蚀件的影响.

  7. Thermoplastic coating of carbon fibers

    Science.gov (United States)

    Edie, D. D.; Lickfield, G. C.; Drews, M. J.; Ellison, M. S.; Gantt, B. W.

    1989-01-01

    A process is being developed which evenly coats individual carbon fibers with thermoplastic polymers. In this novel, continuous coating process, the fiber tow bundle is first spread cover a series of convex rollers and then evenly coated with a fine powder of thermoplastic matrix polymer. Next, the fiber is heated internally by passing direct current through the powder coated fiber. The direct current is controlled to allow the carbon fiber temperature to slightly exceed the flow temperature of the matrix polymer. Analysis of the thermoplastic coated carbon fiber tows produced using this continuous process indicates that 30 to 70 vol pct fiber prepregs can be obtained.

  8. Coatings for improved corrosion resistance

    Energy Technology Data Exchange (ETDEWEB)

    Natesan, K.

    1992-05-01

    Several coating approaches are being developed to resist attack in coal-fired environments and thereby minimize corrosion of underlying substrate alloys and extend the time for onset of breakaway corrosion. In general, coating systems can be classified as either diffusion or overlay type, which are distinguished principally by the method of deposition and the structure of the resultant coating-substrate bond. The coating techniques examined are pack cementation, electrospark deposition, physical and chemical vapor deposition, plasma spray, and ion implantation. In addition, ceramic coatings are used in some applications.

  9. Infrared optical coatings in SITP

    Institute of Scientific and Technical Information of China (English)

    LIU Ding-quan; ZHANG Feng-shan

    2005-01-01

    Infrared optical coatings in SITP (Shanghai Institute of Technical Physics) mainly cover the spectrum range from 0.7 μm to 15 μm, and visible and near-UV range are also been included. The coatings are mainly used for metal-reflectance mirrors, Anti-reflection(AR) lens and windows, filters, and dichroic beam splitters. Coatings passed some dependability tests. These optical coated devices usually consist in a remote observing instrument. Most coating materials are commercial products. And one kind of special material PbTe is made by ourselves. Some main results of our research department are reported.

  10. BIODEGRADABLE COATING FROM AGATHIS ALBA

    Directory of Open Access Journals (Sweden)

    NORYAWATI MULYONO

    2012-11-01

    Full Text Available The adhesive property of copal makes it as a potential coating onto aluminum foil to replace polyethylene. This research aimed to develop copal-based coating. The coating was prepared by extracting the copal in ethyl acetate and dipping the aluminium foil in ethyl acetate soluble extract of copal. The characterization of coating included its thickness, weight, thermal and chemical resistance, and biodegradation. The results showed that the coating thickness and weight increased as the copal concentration and dipping frequency increased. Thermal resistance test showed that the coating melted after being heated at 110°C for 30 min. Copal-based coating wasresistant to acidic solution (pH 4.0, water, and coconut oil, but was deteriorated in detergent 1% (w/v and basic solution (pH 10.0. Biodegradability test using Pseudomonas aeruginosa showed weight reduction of 76.82% in 30 days.

  11. Methods for Coating Particulate Material

    Science.gov (United States)

    Littman, Howard (Inventor); Plawsky, Joel L. (Inventor); Paccione, John D. (Inventor)

    2013-01-01

    Methods and apparatus for coating particulate material are provided. The apparatus includes a vessel having a top and a bottom, a vertically extending conduit having an inlet in the vessel and an outlet outside of the vessel, a first fluid inlet in the bottom of the vessel for introducing a transfer fluid, a second fluid inlet in the bottom of the vessel for introducing a coating fluid, and a fluid outlet from the vessel. The method includes steps of agitating a material, contacting the material with a coating material, and drying the coating material to produce a coated material. The invention may be adapted to coat aerogel beads, among other materials. A coated aerogel bead and an aerogel-based insulation material are also disclosed.

  12. Flow accelerated organic coating degradation

    Science.gov (United States)

    Zhou, Qixin

    Applying organic coatings is a common and the most cost effective way to protect metallic objects and structures from corrosion. Water entry into coating-metal interface is usually the main cause for the deterioration of organic coatings, which leads to coating delamination and underfilm corrosion. Recently, flowing fluids over sample surface have received attention due to their capability to accelerate material degradation. A plethora of works has focused on the flow induced metal corrosion, while few studies have investigated the flow accelerated organic coating degradation. Flowing fluids above coating surface affect corrosion by enhancing the water transport and abrading the surface due to fluid shear. Hence, it is of great importance to understand the influence of flowing fluids on the degradation of corrosion protective organic coatings. In this study, a pigmented marine coating and several clear coatings were exposed to the laminar flow and stationary immersion. The laminar flow was pressure driven and confined in a flow channel. A 3.5 wt% sodium chloride solution and pure water was employed as the working fluid with a variety of flow rates. The corrosion protective properties of organic coatings were monitored inline by Electrochemical Impedance Spectroscopy (EIS) measurement. Equivalent circuit models were employed to interpret the EIS spectra. The time evolution of coating resistance and capacitance obtained from the model was studied to demonstrate the coating degradation. Thickness, gloss, and other topography characterizations were conducted to facilitate the assessment of the corrosion. The working fluids were characterized by Fourier Transform Infrared Spectrometer (FTIR) and conductivity measurement. The influence of flow rate, fluid shear, fluid composition, and other effects in the coating degradation were investigated. We conclude that flowing fluid on the coating surface accelerates the transport of water, oxygen, and ions into the coating, as

  13. Photochromic mesoporous hybrid coatings

    Science.gov (United States)

    Raboin, L.; Matheron, M.; Gacoin, T.; Boilot, J.-P.

    2008-09-01

    Spirooxazine (SO) photochromic molecules were trapped in sol-gel matrices. In order to increase the colourability and improve mechanical properties of sol-gel photochromic films, we present an original strategy in which SO photochromic molecules were dispersed in mesoporous organized films using the impregnation technique. Well-ordered organosilicate mesoporous coatings with the 3D-hexagonal symmetry were prepared by the sol-gel technique. These robust mesoporous films, which contain high amounts of hydrophobic methyl groups at the pore surface, offer optimized environments for photochromic dyes dispersed by impregnation technique. After impregnation by a spirooxazine solution, the photochromic response is only slightly slower when compared with mesostructured or soft sol-gel matrices, showing that mesoporous organized hybrid matrix are good host for photochromic dyes. Moreover, the molecular loading in films is easily adjustable in a large range using multi-impregnation procedure and increasing the film thickness leading to coatings for optical switching devices.

  14. Permeability of edible coatings.

    Science.gov (United States)

    Mishra, B; Khatkar, B S; Garg, M K; Wilson, L A

    2010-01-01

    The permeabilities of water vapour, O2 and CO2 were determined for 18 coating formulations. Water vapour transmission rate ranged from 98.8 g/m(2).day (6% beeswax) to 758.0 g/m(2).day (1.5% carboxymethyl cellulose with glycerol). O2 permeability at 14 ± 1°C and 55 ± 5% RH ranged from 1.50 to 7.95 cm(3)cm cm(-2)s(-1)Pa(-1), with CO2 permeability 2 to 6 times as high. Permeability to noncondensable gases (O2 and CO2) was higher for hydrophobic (peanut oil followed by beeswax) coatings as compared to hydrophilic (whey protein concentrate and carboxymethyl cellulose).

  15. Permeability of edible coatings

    OpenAIRE

    B Mishra; Khatkar, B. S.; Garg, M. K.; Wilson, L.A.

    2010-01-01

    The permeabilities of water vapour, O2 and CO2 were determined for 18 coating formulations. Water vapour transmission rate ranged from 98.8 g/m2.day (6% beeswax) to 758.0 g/m2.day (1.5% carboxymethyl cellulose with glycerol). O2 permeability at 14 ± 1°C and 55 ± 5% RH ranged from 1.50 to 7.95 cm3cm cm−2s−1Pa−1, with CO2 permeability 2 to 6 times as high. Permeability to noncondensable gases (O2 and CO2) was higher for hydrophobic (peanut oil followed by beeswax) coatings as compared to hydrop...

  16. Superelastic Orthopedic Implant Coatings

    Science.gov (United States)

    Fournier, Eric; Devaney, Robert; Palmer, Matthew; Kramer, Joshua; El Khaja, Ragheb; Fonte, Matthew

    2014-07-01

    The demand for hip and knee replacement surgery is substantial and growing. Unfortunately, most joint replacement surgeries will fail within 10-25 years, thereby requiring an arduous, painful, and expensive revision surgery. To address this issue, a novel orthopedic implant coating material ("eXalt") has been developed. eXalt is comprised of super elastic nitinol wire that is knit into a three-dimensional spacer fabric structure. eXalt expands in vivo to conform to the implantation site and is porous to allow for bone ingrowth. The safety and efficacy of eXalt were evaluated through structural analysis, mechanical testing, and a rabbit implantation model. The results demonstrate that eXalt meets or exceeds the performance of current coating technologies with reduced micromotion, improved osseointegration, and stronger implant fixation in vivo.

  17. Design of optical coatings

    Science.gov (United States)

    Gunkel, Claus W.

    1990-08-01

    A highly sophisticated antireflection coating and a cut-on-filter - designed by the Leitz program "RDP" - will be pointed out. The program runs on a VAX 8530 and allows to calculate reflectance, transmittance and phase of randomly polarized light which interacts with marginal surfaces. The number of layers is not limited. Some or even all layers are allowed to be anistropic. Up to four layers may be inhomogeneous both in refractive indices and absorption constants. At a time two thicknesses, two refractive indices and absorption constants as well as the angles of incidence may be varied independently in each run. The calculated values will be compared with the results of measurements. The antireflection coating is evaporated in a Balzers high vacuum evaporation plant, controlled by the process unit BPU 420, whereas the cut-on filter is evaporated in a Leybold box coater with Leycom III and two electron-beam guns.

  18. The Failure Mechanisms and Solutions of Anti-wear Thermal Spray Coatings for Solid Waste Incineration Circulating Fluidized Bed Boiler%垃圾焚烧循环流化床锅炉防磨热喷涂涂层失效机理及对策

    Institute of Scientific and Technical Information of China (English)

    胡金力; 陈国星; 黄科峰; 吴树辉; 盛洪产; 楼军; 章平衡; 薛猛

    2012-01-01

    本文分析了垃圾焚烧炉循环流化床(CFB)锅炉水冷壁管防磨热喷涂涂层的失效机理:S及碱金属等引起的S腐蚀导致涂层鼓泡,在炉内高温物料的磨损下涂层逐渐破损、剥落直至加速剥落失效。热喷涂防腐抗磨双效复合涂层能很好的解决了垃圾焚烧炉水冷壁同时存在的高温腐蚀和磨损的问题。%This paper analyzes the failure mechanisms of anti-wear thermal spray coatings on water wall tube of the wastes incineration Circulating Fluidized Bed (CFB) boiler. Sulfur corrosion caused by alkali, S and the Compound above lead to coatings bubbling, which are then gradually abraded by the high temperature flowing objects in the boiler. The coatings would be peeled off faster and faster once they are breaking. Composite thermal spray coatings of double-effect,corrosion, both abrasion resistant anticorrosive, is a good solution to high temperature corrosion and wear problems simultaneously.

  19. Thermal barrier coating materials

    Directory of Open Access Journals (Sweden)

    David R. Clarke

    2005-06-01

    Full Text Available Improved thermal barrier coatings (TBCs will enable future gas turbines to operate at higher gas temperatures. Considerable effort is being invested, therefore, in identifying new materials with even better performance than the current industry standard, yttria-stabilized zirconia (YSZ. We review recent progress and suggest that an integrated strategy of experiment, intuitive arguments based on crystallography, and simulation may lead most rapidly to the development of new TBC materials.

  20. for zeolite coating

    Directory of Open Access Journals (Sweden)

    Carlos Renato Rambo

    2006-01-01

    Full Text Available Biotemplating is the processing of microcellular ceramics by reproduction of natural morphologies, where the microstructural features of the biotemplate are maintained in the biomorphic ceramic. Different biotemplates with distinct pore anatomies were used to produce biomorphic supports for the zeolite coating: wood, cardboard, sea-sponge and sisal. The biomorphic ceramics were produced by distinguished processing routes: Al-gas infiltration-reaction, liquid-metal infiltration, dip-coating and sol-gel synthesis, in order to produce nitrides, carbides and oxides, depending on the processing conditions. The zeolite coating was performed by hydrothermal growth of MFI-type (Silicalite-1 and ZSM-5 zeolite crystals onto the internal pore walls of the biomorphic templates. The final biomorphic ceramic-zeolite composites were physically characterized, evaluated in terms of their gas adsorption capabilities and correlated to their microstructure and specific pore anatomy. The combination of the properties of the biomorphic ceramics with the adsorption properties of zeolites results in materials with distinct properties as potential candidates for adsorption and catalytic applications due to their characteristic porosity, molecular sieving capabilities and high thermo-mechanical strength.

  1. Coating and curing apparatus and methods

    Energy Technology Data Exchange (ETDEWEB)

    Brophy, Brenor L.; Gonsalves, Peter R.; Maghsoodi, Sina; Colson, Thomas E.; Yang, Yu S.; Abrams, Ze' ev R.

    2016-04-19

    Disclosed is a coating apparatus including flow coating and roll-coating that may be used for uniform sol-gel coating of substrates such as glass, solar panels, windows or part of an electronic display. Also disclosed are methods for substrate preparation, flow coating and roll coating. Lastly, systems and methods for curing sol-gel coatings deposited onto the surface of glass substrates using high temperature air-knives, infrared emitters and direct heat applicators are disclosed.

  2. High-temperature protective coatings on superalloys

    Institute of Scientific and Technical Information of China (English)

    刘培生; 梁开明; 周宏余

    2002-01-01

    Protective coatings are essential for superalloys to serve as blades of gas turb ines at high temperatures, and they primarily include aluminide coating, MCrAlY overlay coating, thermal barrier coating and microcrystalline coating. In this paper, all these high-temperature coatings are reviewed as well as their preparing techniques. Based on the most application and the main failure way, the importance is then presented for further deepgoing study on the high-temperature oxidation law of aluminide coatings.

  3. A New Coating Process for Production of Coated Magnesium Powders

    Science.gov (United States)

    2008-04-16

    TGA data for magnesium hydroxide content. TGA analysis of the as-coated powders is a reproducible and accurate method for the determination of... TGA analysis of the as-coated powder, there is approximately 3wt% magnesium hydroxide present in the material due to the process variation compared...11: Magnesium hydroxide content as measured by TGA analysis for the 1-lb batches of as-coated ground powder Figure 12: Nitrometer analysis of

  4. Nanoparticle/Polymer Nanocomposite Bond Coat or Coating

    Science.gov (United States)

    Miller, Sandi G.

    2011-01-01

    This innovation addresses the problem of coatings (meant to reduce gas permeation) applied to polymer matrix composites spalling off in service due to incompatibility with the polymer matrix. A bond coat/coating has been created that uses chemically functionalized nanoparticles (either clay or graphene) to create a barrier film that bonds well to the matrix resin, and provides an outstanding barrier to gas permeation. There is interest in applying clay nanoparticles as a coating/bond coat to a polymer matrix composite. Often, nanoclays are chemically functionalized with an organic compound intended to facilitate dispersion of the clay in a matrix. That organic modifier generally degrades at the processing temperature of many high-temperature polymers, rendering the clay useless as a nano-additive to high-temperature polymers. However, this innovation includes the use of organic compounds compatible with hightemperature polymer matrix, and is suitable for nanoclay functionalization, the preparation of that clay into a coating/bondcoat for high-temperature polymers, the use of the clay as a coating for composites that do not have a hightemperature requirement, and a comparable approach to the preparation of graphene coatings/bond coats for polymer matrix composites.

  5. Dense protective coatings, methods for their preparation and coated articles

    Energy Technology Data Exchange (ETDEWEB)

    Tulyani, Sonia; Bhatia, Tania; Smeggil, John G.

    2015-12-29

    A method for depositing a protective coating on a complex shaped substrate includes the steps of: (1) dipping a complex shaped substrate into a slurry to form a base coat thereon, the slurry comprising an aqueous solution, at least one refractory metal oxide, and at least one transient fluid additive present in an amount of about 0.1 percent to 10 percent by weight of the slurry; (2) curing the dipped substrate; (3) dipping the substrate into a precursor solution to form a top barrier coat thereon; and (4) heat treating the dipped, cured substrate to form a protective coating.

  6. Low Conductivity Thermal Barrier Coatings

    Science.gov (United States)

    Zhu, Dong-Ming

    2005-01-01

    Thermal barrier coatings will be more aggressively designed to protect gas turbine engine hot-section components in order to meet future engine higher fuel efficiency and lower emission goals. In this presentation, thermal barrier coating development considerations and requirements will be discussed. An experimental approach is established to monitor in real time the thermal conductivity of the coating systems subjected to high-heat-flux, steady-state and cyclic temperature gradients. Advanced low conductivity thermal barrier coatings have also been developed using a multi-component defect clustering approach, and shown to have improved thermal stability. The durability and erosion resistance of low conductivity thermal barrier coatings have been improved utilizing advanced coating architecture design, composition optimization, in conjunction with more sophisticated modeling and design tools.

  7. Pipeline integrity : control by coatings

    Energy Technology Data Exchange (ETDEWEB)

    Khanna, A.S. [Indian Inst. of Technology, Bombay (India)

    2008-07-01

    This presentation provided background information on the history of cross-country pipelines in India. It discussed the major use of gas. The key users were described as being the power and fertilizer industries, followed by vehicles using compressed natural gas to replace liquid fuels and thereby reduce pollution. The presentation also addressed the integrity of pipelines in terms of high production, safety, and monitoring. Integrity issues of pipelines were discussed with reference to basic design, control of corrosion, and periodic health monitoring. Other topics that were outlined included integrity by corrosion control; integrity by health monitoring; coatings requirements; classification of UCC pipeline coatings; and how the pipeline integrity approach can help to achieve coatings which give design life without any failure. Surface cleanliness, coating conditions, and the relationship between temperature of Epoxy coating and the time of adhesive coating were also discussed. Last, the presentation provided the results of an audit of the HBJ pipeline conducted from 1999 to 2000. tabs., figs.

  8. Causticity and Anti-corrosion Measures for Soil in Northwest Gobi Region%西北戈壁地区岩土腐蚀性与防腐措施分析

    Institute of Scientific and Technical Information of China (English)

    任治军; 任亚群; 宋志远

    2013-01-01

      本文针对±800kV哈密南-郑州特高压直流输电线路工程的岩土工程勘测实践,对西北戈壁地区特高压送电线路工程的场地土腐蚀性评价工作方法进行了论述,主要包括样本采取原则、取样点布置、试验结果分析等。在分析试验成果的基础上,根据规范对线路地基土的腐蚀性进行了综合评价,并提出了相应的防腐处理建议。%This thesis focuses on the geotechnical engineering practice of the 800kV direct-current (DC) transmission line project from south of Hami to Zhengzhou. Corrosive evaluation methods for site soil of the ultra-high voltage transmission line engineering in Northwest Gobi region are discussed, mainly including sampling principle, sampling point layout and test result analysis, etc. Based on the analysis of test results, comprehensive foundation soil corrosive evaluation is conducted and corresponding suggestions on anti-corrosive treatment are put forward according to relevant codes.

  9. Study on anti-corrosion of penstock of Kozjak Hydropower Station in Macedonia%马其顿科佳水电站压力钢管防腐问题研究

    Institute of Scientific and Technical Information of China (English)

    张军; 赵春; 刘景运

    2012-01-01

    During the construction of Kozjak Hydropower Station in Macedonia contracted by a Chinese company, a largeramount of air bubble occurs on the surface of the anti-corrosion layer of the penstock of the underground headrace tunnel, and then not only the construction quality is seriously impacted, but the construction progress is also restricted. Through the analysis on the causation of the problem, a scheme of project alternation is put forward herein, and it is successfully implemented on the basis of the relevant site test and adoption of the mature technologies concerned The result shows that a better effect is obtained with this construction scheme and the hydropower station is ensured to be put into operation in time.%中国公司承接的马其顿科佳水电站工程在施工过程中,地下隧洞的钢管防腐层出现了大量表面气泡,严重影响工程质量和制约工程进度.通过对问题发生原因进行分析,基于现场试验并采用成熟技术,提出了工程变更方案并成功进行了实施.结果表明,本文提出的施工方案取得了良好的效果,保障了该水电站的如期发电.

  10. Functional Coatings with Polymer Brushes

    OpenAIRE

    König, Meike

    2013-01-01

    The scope of this work is to fathom different possibilities to create functional coatings with polymer brushes. The immobilization of nanoparticles and enzymes is investigated, as well as the affection of their properties by the stimuli-responsiveness of the brushes. Another aspect is the coating of 3D-nanostructures by polymer brushes and the investigation of the resulting functional properties of the hybrid material. The polymer brush coatings are characterized by a variety of microscopic a...

  11. Article Including Environmental Barrier Coating System

    Science.gov (United States)

    Lee, Kang N. (Inventor)

    2015-01-01

    An enhanced environmental barrier coating for a silicon containing substrate. The enhanced barrier coating may include a bond coat doped with at least one of an alkali metal oxide and an alkali earth metal oxide. The enhanced barrier coating may include a composite mullite bond coat including BSAS and another distinct second phase oxide applied over said surface.

  12. Protective coatings on extensible biofibres

    Science.gov (United States)

    Holten-Andersen, Niels; Fantner, Georg E.; Hohlbauch, Sophia; Waite, J. Herbert; Zok, Frank W.

    2007-09-01

    Formulating effective coatings for use in nano- and biotechnology poses considerable technical challenges. If they are to provide abrasion resistance, coatings must be hard and adhere well to the underlying substrate. High hardness, however, comes at the expense of extensibility. This property trade-off makes the design of coatings for even moderately compliant substrates problematic, because substrate deformation easily exceeds the strain limit of the coating. Although the highest strain capacity of synthetic fibre coatings is less than 10%, deformable coatings are ubiquitous in biological systems. With an eye to heeding the lessons of nature, the cuticular coatings of byssal threads from two species of marine mussels, Mytilus galloprovincialis and Perna canaliculus, have been investigated. Consistent with their function to protect collagenous fibres in the byssal-thread core, these coatings show hardness and stiffness comparable to those of engineering plastics and yet are surprisingly extensible; the tensile failure strain of P. canaliculus cuticle is about 30% and that of M. galloprovincialis is a remarkable 70%. The difference in extensibility is attributable to the presence of deformable microphase-separated granules within the cuticle of M. galloprovincialis. The results have important implications in the design of bio-inspired extensible coatings.

  13. Corrosion behavior of duplex coatings

    Directory of Open Access Journals (Sweden)

    K. Raghu Ram Mohan Reddy

    2016-07-01

    Full Text Available The titanium alloys are used in defense, aerospace, automobile, chemical plants and biomedical applications due to their very high strength and lightweight properties. However, corrosion is a life-limiting factor when Ti alloys are exposed to different chemical environments at high temperatures. In the present paper, duplex NiCrAlY/WC–Co coating is coated onto Ti6Al4V substrate to investigate the corrosion behavior of both coated samples and the substrate. The duplex coating was performed with NiCrAlY as the intermediate coat of 200 μm thickness deposited by HVOF process and WC–Co ceramic top coat with varying thicknesses of 250 μm, 350 μm and 450 μm deposited by DS process. Potentiodynamic polarization tests were employed to investigate the corrosion performance of duplex coated samples and substrate in Ringer’s solution at 37 °C and pH value was set to 5.7. Finally the results reveal that 350 μm thick coated samples showed highest corrosion resistance compared to 250 μm thick samples as well as bare substrate. However, the 450 μm thick coated sample showed poor corrosion resistance compared to the substrate. The scale formed on the samples upon corrosion was characterized by using SEM analysis to understand the degree of corrosion behavior.

  14. Coatings Technology Integration Office (CTIO)

    Data.gov (United States)

    Federal Laboratory Consortium — CTIO serves as the Air Force's central resource for aircraft coating systems and their applications. CTIO's primary objectives are pollution prevention and improved...

  15. Electrochemically switchable polypyrrole coated membranes

    Energy Technology Data Exchange (ETDEWEB)

    Weidlich, Claudia, E-mail: weidlich@dechema.d [DECHEMA e.V., Karl-Winnacker-Institut, Theodor-Heuss-Allee 25, D-60486 Frankfurt am Main (Germany); Mangold, Klaus-Michael [DECHEMA e.V., Karl-Winnacker-Institut, Theodor-Heuss-Allee 25, D-60486 Frankfurt am Main (Germany)

    2011-04-01

    A method for coating membranes with polypyrrole (PPy) has been developed. Different membranes, such as microfiltration as well as ion exchanger membranes have been coated with PPy to yield electrical conductivity of the membranes. The coated membranes have been investigated by cyclic voltammetry and scanning electron microscopy and their permeability and permselectivity have been tested. The results show that PPy can be tailored as cation or anion exchanger and its porosity can be controlled to avoid any impairment of the membrane by the polymer layer. These PPy coated membranes can be applied as electrochemically switchable, functionalised membranes with controllabel and variable separation properties.

  16. Studies on Nanocomposite Conducting Coatings

    Directory of Open Access Journals (Sweden)

    Amitava Bhattacharyya

    2013-01-01

    Full Text Available Nanocomposite conducting coatings can impart stable surface electrical conductivity on the substrate. In this paper, carbon nanofiber (CNF and nanographite (NG are dispersed in thermoplastic polyurethane matrix and coated on the surface of glass and polyethylene terephthalate (PET film. The nanoparticles dispersion was studied under TEM. The coating thicknesses were estimated. Further, their resistance and impedance were measured. It has been observed that the 5 wt% CNF dispersed nanocomposite coatings show good conductivity. The use of NG can bring down the amount of CNF; however, NG alone has failed to show significant improvement in conductivity. The nanocomposite coating on PET film using 2.5 wt% of both CNF and NG gives frequency-independent impedance which indicates conducting network formation by the nanoparticles. The study was carried out at different test distances on nanocomposite coated PET films to observe the linearity and continuity of the conducting network, and the result shows reasonable linearity in impedance over total test length (from 0.5 cm to 4.5 cm. The impedance of nanocomposite coatings on glass is not frequency independent and also not following linear increase path with distance. This indicates that the dispersion uniformity is not maintained in the coating solution when it was coated on glass.

  17. Mold and Crucible Coatings

    Science.gov (United States)

    1986-04-28

    34;" -"""-"’" " " ""’’ "" "" ’"" ’ j * AD I. AT)-E 9 7 W CONTRACTOR REPORT ARCCD-CR-86007 MOLD AND CRUCIBLE COATINGS Sylvia J. Canino Arthur L. Geary Nuclear...IFnlRpr April 1984_-_December 198, .. AUTNORfo) S. CONTRACT on CRAM? # "I MWef(e)I Sylvia J. Canino and Arthur L. Geary DAAK1O-84-C-0056 PERFORMING

  18. USAF Inorganic Coating Successes

    Science.gov (United States)

    2012-08-01

    in2 (Marginal Fail) 7 or more pits were seen in a total of 30 in2 (Fail) Aluminum CFCC Screening Test Results Conversion Coating Alloy OC-ALC... 6061 168+ Hours 7075 168+ Hours 2024 48 Hours 5052 48-72 Hours 72-168+ Hours (5 pits on one panel at 48 hours, but then no more ) 6061 72...Dichromate Sealer Test Results Sealer Substrate Quality Thickness Corrosion Primer Dry Tape Adhesion Wet Tape Adhesion Baseline 1 Al 2024-T3 PASS

  19. Thermal Protective Coatings

    Science.gov (United States)

    1976-03-31

    within 2 minutes for the No. 4. Sodiurn silicate was tested with alumnnunm hydroxide, nerlite, vermiculite and borax filler systems. None of the systems...1.27 cm) thick, 3/16 inch (0.48 cm) cell size, 5.5 lbs/ft 3 (88.1 kg/m 3 ) glass/phenolic honey - p comib set into the fire retardant maLerial. The sheets...COATING SPECIMEN PERCENT BY WEIGHT THICKNESS WEIGHT ANO. MATRIX FILLrR 1’fLS (CM) LBS/FT. (kg,’-), 26 50% Shell 828 Epoxy Resin Borax - 54 (.14) .39

  20. Microplasma sprayed hydroxyapatite coatings

    CERN Document Server

    Dey, Arjun

    2015-01-01

    ""This unique book on development of microplasma sprayed HAp coating has been organized in a very compact yet comprehensive manner. This book also highlights the horizons of future research that invites the attention of global community, particularly those in bio-medical materials and bio-medical engineering field. This book will surely act as a very useful reference material for both graduate/post-graduate students and researchers in the field of biomedical, orthopedic and manufacturing engineering and research. I truly believ that this is the first ever effort which covers almost all the

  1. Dry coating, a novel coating technology for solid pharmaceutical dosage forms.

    Science.gov (United States)

    Luo, Yanfeng; Zhu, Jesse; Ma, Yingliang; Zhang, Hui

    2008-06-24

    Dry coating is a coating technology for solid pharmaceutical dosage forms derived from powder coating of metals. In this technology, powdered coating materials are directly coated onto solid dosage forms without using any solvent, and then heated and cured to form a coat. As a result, this technology can overcome such disadvantages caused by solvents in conventional liquid coating as serious air pollution, high time- and energy-consumption and expensive operation cost encountered by liquid coating. Several dry coating technologies, including plasticizer-dry-coating, electrostatic-dry-coating, heat-dry-coating and plasticizer-electrostatic-heat-dry-coating have been developed and extensively reported. This mini-review summarized the fundamental principles and coating processes of various dry coating technologies, and thoroughly analyzed their advantages and disadvantages as well as commercialization potentials.

  2. Alternative HTS coated conductors

    Science.gov (United States)

    Blaugher, R. D.; Bhattacharya, R. N.; Chen, J.; Padmanabhan, R.

    2002-10-01

    The availability of Bi-2223 high-temperature-superconductor (HTS) powder-in-tube (PIT) tape, with acceptable performance for long lengths, has provided the ability to construct a wide range of HTS electric power components. As a result, there are major worldwide projects in developing HTS electric power components for demonstration in a utility environment. Utility acceptance for superconducting power equipment will depend on several key factors: improved system performance, lower life-cycle costs, higher efficiency versus conventional technology, reliability and maintenance comparable to conventional power equipment, and a competitive installed cost. The latter is impacted by the current high cost of HTS conductors, which must be lowered to costs comparable to conventional Nb-Ti wire, i.e., $2-5/kAm. The present performance and cost of state-of-the-art Bi-2223 HTS tape, although acceptable for prototype construction, is viewed as a major deterrent that may compromise eventual commercialization for most of these electric power devices. The so-called second-generation coated conductor development, with emphasis on conductors employing HTS YBCO films, is viewed as the solution to this performance and cost issue. The potential for the Tl, Hg, and Bi-oxide superconductors for producing an HTS tape as alternatives to Bi-2223 PIT (and YBCO) will be discussed with some recent results on Bi-2212 “coated conductor” development.

  3. Westinghouse thermal barrier coatings development

    Energy Technology Data Exchange (ETDEWEB)

    Goedjen, J.G.; Wagner, G. [Westinghouse Electric Corp., Orlando, FL (United States)

    1995-10-01

    Westinghouse, in conjunction with the Department of Energy and Oak Ridge National Laboratory, has embarked upon a program for the development of advanced thermal barrier coatings for industrial gas turbines. Development of thermal barrier coatings (TBC`s) for industrial gas turbines has relied heavily on the transfer of technology from the aerospace industry. Significant differences in the time/temperature/stress duty cycles exist between these two coating applications. Coating systems which perform well in aerospace applications may not been optimized to meet power generation performance requirements. This program will focus on development of TBC`s to meet the specific needs of power generation applications. The program is directed at developing a state-of-the-art coating system with a minimum coating life of 25,000 hours at service temperatures required to meet increasing operating efficiency goals. Westinghouse has assembled a team of university and industry leaders to accomplish this goal. Westinghouse will coordinate the efforts of all program participants. Chromalloy Turbine Technologies, Inc. and Sermatech International, Inc. will be responsible for bond coat and TBC deposition technology. Praxair Specialty Powders, Inc. will be responsible for the fabrication of all bond coat and ceramic powders for the program. Southwest Research Institute will head the life prediction modelling effort; they will also be involved in coordinating nondestructive evaluation (NDE) efforts. Process modelling will be provided by the University of Arizona.

  4. Pack cementation coatings for alloys

    Energy Technology Data Exchange (ETDEWEB)

    He, Yi-Rong; Zheng, Minhui; Rapp, R.A. [Ohio State Univ., Columbus, OH (United States)

    1996-08-01

    The halide-activated pack cementation process was modified to produce a Ge-doped silicide diffusion coating on a Cr-Cr{sub 2}Nb alloy in a single processing step. The morphology and composition of the coating depended both on the composition of the pack and on the composition and microstructure of the substrate. Higher Ge content in the pack suppressed the formation of CrSi{sub 2} and reduced the growth kinetics of the coating. Ge was not homogeneously distributed in the coatings. In cyclic and isothermal oxidation in air at 700 and 1050{degrees}C, the Ge-doped silicide coating protected the Cr-Nb alloys from significant oxidation by the formation of a Ge-doped silica film. The codeposition and diffusion of aluminum and chromium into low alloy steel have been achieved using elemental Al and Cr powders and a two-step pack cementation process. Sequential process treatments at 925{degrees}C and 1150{degrees}C yield dense and uniform ferrite coatings, whose compositions are close to either Fe{sub 3}Al or else FeAl plus a lower Cr content, when processed under different conditions. The higher content of Al in the coatings was predicted by thermodynamic calculations of equilibrium in the gas phase. The effect of the particle size of the metal powders on the surface composition of the coating has been studied for various combinations of Al and Cr powders.

  5. POWDER COATINGS: A TECHNOLOGY REVIEW

    Science.gov (United States)

    In 1995, surface coatings accounted for nearly 2.55 million Mg of volatile organic compound (VOC) emissions nationally, which is more than 12% of VOC emissions from all sources. In recent years, powder coatings have been steadily gaining popularity as an alternative to solvent-bo...

  6. Foundry Coating Technology: A Review

    DEFF Research Database (Denmark)

    Nwaogu, Ugochukwu Chibuzoh; Tiedje, Niels Skat

    2011-01-01

    is important. In this review, a detailed description of these topics and examples are provided where necessary. A potential area of research in foundry coating development, using sol-gel process is suggested. The application of sol-gel technology in the development of foundry coatings is a novel approach....

  7. External coating of colonic anastomoses

    DEFF Research Database (Denmark)

    Pommergaard, Hans-Christian; Achiam, Michael Patrick; Rosenberg, Jacob

    2012-01-01

    Colon anastomotic leakage remains both a frequent and serious complication in gastrointestinal surgery. External coating of colonic anastomoses has been proposed as a means to lower the rate of this complication. The aim of this review was to evaluate existing studies on external coating of colonic...

  8. Bright Prospects for Fluorine Coatings

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ Fluorine coatings are a category of new coatings with fluorine-containing resins as the major film forming substances.They have excellent weather resistance,solvent resistance, acid/alkali resistance, no toxicity and no hazards,and they contribute to film stability.

  9. Intumescent coatings under fast heating

    DEFF Research Database (Denmark)

    Nørgaard, Kristian Petersen; Dam-Johansen, Kim; Català, Pere

    2012-01-01

    Intumescent coatings are widely used to delay or minimise the destructive effects of fire. They are usually tested under conditions that simulate the relatively slow build-up of heat in a normal fire. Here, the effects of damage during a fire causing sudden heating of the coating were studied....

  10. Lignin based controlled release coatings

    NARCIS (Netherlands)

    Mulder, W.J.; Gosselink, R.J.A.; Vingerhoeds, M.H.; Harmsen, P.F.H.; Eastham, D.

    2011-01-01

    Urea is a commonly used fertilizer. Due to its high water-solubility, misuse easily leads to excess nitrogen levels in the soil. The aim of this research was to develop an economically feasible and biodegradable slow-release coating for urea. For this purpose, lignin was selected as coating material

  11. Moisture transport in coated wood

    NARCIS (Netherlands)

    Meel, P.A. van; Erich, S.J.F.; Huinink, H.P.; Kopinga, K.; Jong, J. DE; Adan, O.C.G.

    2011-01-01

    Moisture accumulation inside wood causes favorable conditions for decay. Application of a coating alters the moisture sorption of wood and prevents accumulation of moisture. This paper presents the results of a nuclear magnetic resonance (NMR) study on the influence of a coating on the moisture abso

  12. Coating of silicon pore optics

    DEFF Research Database (Denmark)

    Cooper-Jensen, Carsten P.; Ackermann, M.; Christensen, Finn Erland;

    2009-01-01

    For the International X-ray observatory (IXO), a mirror module with an effective area of 3 m2 at 1.25 keV and at least 0.65 m2 at 6 keV has to be realized. To achieve this goal, coated silicon pore optics has been developed over the last years. One of the challenges is to coat the Si plates...... and still to realize Si-Si bonding. It has been demonstrated that ribbed silicon plates can be produced and assembled into stacks. All previously work has been done using uncoated Si plates. In this paper we describe how to coat the ribbed Si plates with an Ir coating and a top C coating through a mask so...

  13. Dynamic residual stress in thermal sprayed coatings

    Institute of Scientific and Technical Information of China (English)

    Wang Zhiping; Yang Yuanyuan

    2005-01-01

    With the modified Almen method, the forming and development process of residual stress in a thermal sprayed coating has been obtained. The test results identify that the residual stress in a coating is depend on coating material properties, technique and coating thickness. The paper pays much attention to the hysteresis between the coating temperature and residual stress in the coating or between the applied stress and the strain of the coating, and confirms that the fact is resulted from the"Gas Fix" character of a thermal sprayed coating.

  14. Study and Practice of Anti-corrosion Painting Systems for Exposed Steel Structures at the Top of the Shanghai Tower%上海中心大厦塔冠外露钢结构防腐涂装体系的研究与实践

    Institute of Scientific and Technical Information of China (English)

    宋伟宁

    2014-01-01

    The top of the Shanghai Tower is the first tower structure ever reached 600 meters high in domestic architecture history.Routine techniques in anti-corrosion of steel structure are not proper in this case due to the structure complexity,numerous related equipment,harsh environment and difficult construction proce-dures.After analysing the nature as well as construction conditions of the top of the tower and repeating steps of denying,adjusting and re-denying,a new anti-corrosion system aimed to achieve long effective corrosion prevention was proposed.Furthermore,the effectiveness of this system was verified by experiments.Combi-ning with strict quality control,this anti-corrosion system was finally applied in the corrosion prevention for ex-posed steel structures at the top of the Shanghai Tower.%上海中心大厦塔冠是国内房屋建筑史上第一次达到600 m 以上高度的塔顶建筑,由于其结构复杂、关联设备众多、环境条件严酷、施工难度大,常规的钢结构防腐经验难以适用。通过对塔冠自然条件和施工条件的深入分析,陈述了原方案的否定、调整和再否定,并在大量工程调研的基础上,提出了新的长效防腐体系。通过试验检验,结合严格的工艺质量控制,使这一新的组合配套防腐体系在大厦塔冠钢结构防腐实践中得到落实应用。

  15. Effects of different polypyrrole/TiO2 nanocomposite morphologies in polyvinyl butyral coatings for preventing the corrosion of mild steel

    Science.gov (United States)

    Mahmoudian, M. R.; Alias, Y.; Basirun, W. J.; Ebadi, M.

    2013-03-01

    This study addresses the synthesis and comparison of the corrosion protective properties of two different polypyrrole/TiO2 nanocomposite (PPy/TiO2 NC) morphologies in a polyvinyl butyral coating on mild steel. The polymerization was performed via low-temperature in situ chemical oxidative polymerization in the presence of methyl orange (MO) and dodecyl benzene sulfonic acid (DBSA). The field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results show two different spherical and tube shapes in the core-shell structure of the PPy/TiO2 NCs synthesized in the presence DBSA and MO, respectively. The TEM results indicate that a thinner polypyrrole (PPy) shell is synthesized on the PPy/TiO2 NCs in the presence of MO than that synthesized in the presence of DBSA. Thermogravimetric analysis (TGA) results indicate that the mass percentages of the TiO2 NPs in the PPy/TiO2 NCs synthesized in the presence of MO and DBSA are 29.71 and 33.84%, respectively. The PPy/TiO2 NCs synthesized in the presence of MO were found to yield better anti-corrosion performance than those synthesized in the presence of DBSA. This result is due to the effect of the PPy surface area, which has more influence over corrosion control than the percentage of TiO2 nanoparticles in the nanocomposites.

  16. Tribological Performance of Coated Surfaces

    Institute of Scientific and Technical Information of China (English)

    Kenneth Holmberg; Anssi Laukkanen

    2004-01-01

    The fundamentals of coating tribology is presented in a generalised holistic approach to friction and wear mechanisms of coated surfaces in dry sliding contacts. It is based on a classification of the tribological contact process into macromechanical, micromechanical, tribochemical contact mechanisms and material transfer. The tribological contact process is dominated by the macromechanical mechanisms, which have been systematically analysed by using four main parameters: the coating-to-substrate hardness relationship, the film thickness, the surface roughness and the debris in the contact. In this paper special attention is given to the microlevel mechanisms, and in particular new techniques for modelling the elastic, plastic and brittle behaviour of the surface by finite element (FEM) computer simulations. The contact condition with a sphere sliding over a plate coated with a very thin hard coating is analysed. A three dimensional FEM model has been developed for calculating the first principal stress distribution in the scratch tester contact of a diamond spherical tip moving with increased load on a 2 μm thick titanium nitride (TiN) coated steel surface. The model is comprehensive in that sense that it considers elastic, plastic and fracture behaviour of the contact surfaces. By identifying from a scratch experiment the location of the first crack and using this as input data can the fracture toughness of the coating be determined.

  17. 牙用镍铬合金表面不同涂层电化学腐蚀研究%A research on the corrosion resistance of Ni-Cr alloy with different coatings

    Institute of Scientific and Technical Information of China (English)

    张丽仙; 赵铱民; 邵龙泉; 柳玉晓

    2009-01-01

    目的:通过电化学腐蚀法测试镍铬合金表面不同涂层在中性及酸性环境中的抗腐蚀性能.方法:分别以中性和酸性人工唾液为电解液,测量不同涂层的镍铬合金试件电极的自然腐蚀电位Ecorr、极化电阻Rp.结果:在中性和酸性人工唾液中,无论镀膜与否的镍铬合金的自腐蚀电位(Ecorr)均为正值,不易发生电化学腐蚀和电偶腐蚀.结论:氮化钛膜、电镀金膜、金泥涂层及金瓷涂层的镍铬合金具有较强抗腐蚀性和美观性,可提高基体金属的耐腐蚀性能.%Objective: To evaluate the corrosion resistance of Ni-Cr alloy with different coatings in neutral and acid saliva by electrochemistry method. Methods: Measured the self-corrosion potential (Ecorr) and polarization resistance(Rp) curves of Ni-Cr alloy models with different coatings in neutral and acid artificial salivas. Results: The Ecorr of the Ni-Cr alloys all showed positive values, the electrochemistry corrosion and galvanic corrosion were not detected. Conclusion: Ni-Cr alloy with titanium nitride coating, gold electroplating coating, gold-paste layer and gold-porcelain blended layer have both anti-corrosion and esthetical function without changing its own property.

  18. Preparation of Free-passivating Painting Nano-materials Composite Powder Coating%可免钝化涂装的纳米材料复合粉末涂料研制

    Institute of Scientific and Technical Information of China (English)

    张宝忠; 严素荣; 张立德; 方克明

    2012-01-01

    用SiO2、ZnO、TiO2 3种纳米材料复合改性粉末涂料,显著改进涂膜的附着力和防蚀性,制得的纳米材料复合粉末涂料在铝合金型材上无铬钝化涂装,产品性能完全达到有关国标和行标的要求,某些性能超过对应的传统涂装的产品性能。对涂膜形态、涂膜与铝合金的界面结构用扫描电镜、透射电镜进行了表征。并介绍了该产品在减少六价铬的污染、节约成本上的重大意义及推广前景。%Nano-material compound modification powder coatings was prepared by using nano SiO2, ZnO and TiO2 three nano-material, the film adhesion and anticorrosion were improved significantly, the prepared nano-material compound powder coating was painting on the surface of aluminium alloy profile by chromium-free passivating coating process, the product properties fully meet the relevant national standard and industry standard, and some properties of the coating more than corresponding traditional product performance. The film conformation, film and the interface of aluminum alloy structure were characterized by scanning electron microscope and transmission electron microscopy. And the major significance and promotion prospects of the products in reducing the hexavalent chromium pollution and cost saving were introduced.

  19. PATINA Network - Performance of coil coating in natural atmospheres of Ibero-America

    Directory of Open Access Journals (Sweden)

    Rosales, B. M.

    2003-12-01

    Full Text Available The research work performed on 12 coil coating materials in the frame of the PATINA Network (Anticorrosive Protection in the Atmosphere sponsored by CYTED is discussed. It includs the task accomplished by Science and Technology institutions of Ibero-America on formulations supplied by different prcoduction Sector companies from the participating countries, between 1996 and 2000. Coil coating schemes were exposed outdoors, according to ISO 2810 standards, in 9 ambient conditions of the MICAT (Ibero-American Test Stations Network, CYTED. The protective characteristics on the steel base metal was determined as a function of time, following ISO 4628 and ASTM D 3274 standards. Electrochemical impedance spectroscopy (EIS was applied on various materials after 1, 2, 3 years and 42 months exposure, to evaluate the weathering effect in different atmospheric conditions.

    Se discute el trabajo realizado sobre 12 diferentes recubrimientos para banda continua en el marco de la Red PATINA (Protección Anticorrosiva en la Atmósfera, patrocinada por el CYTED. Incluye las actividades llevadas a cabo por instituciones de Ciencia y Técnica de Iberoamérica, sobre distintas formulaciones provistas por empresas productoras de los países participantes, entre 1996 y 1999. Se expusieron a la intemperie, en distintas condiciones ambientales de la Red de Estaciones MICAT, CYTED, siguiendo la norma ISO 2810, recubrimientos de diferentes formulaciones. Se evaluaron las características protectoras sobre el acero de base en función de los parámetros medio-ambientales y los tiempos de exposición programados, según la normas ISO 4628, 4623 y ASTM D 3274. Se aplicaron dos esquemas de protección orgánicos sobre las muestras de acero, otros cuatro sobre muestras de acero previamente protegido con Zn y otros seis sobre acero galvanizado (2 y recubierto con galvalume (4, con y sin incisión en cada esquema hasta llegar el acero. Se discuten los resultados obtenidos

  20. Integrated Glass Coating Manufacturing Line

    Energy Technology Data Exchange (ETDEWEB)

    Brophy, Brenor [Enki Technology Inc., San Jose, CA (United States)

    2015-09-30

    This project aims to enable US module manufacturers to coat glass with Enki’s state of the art tunable functionalized AR coatings at the lowest possible cost and highest possible performance by encapsulating Enki’s coating process in an integrated tool that facilitates effective process improvement through metrology and data analysis for greater quality and performance while reducing footprint, operating and capital costs. The Phase 1 objective was a fully designed manufacturing line, including fully specified equipment ready for issue of purchase requisitions; a detailed economic justification based on market prices at the end of Phase 1 and projected manufacturing costs and a detailed deployment plan for the equipment.

  1. Intumescent Coatings as Fire Retardants

    Science.gov (United States)

    Parker, J. A.; Fohlen, G. M.; Sawko, P. M.; Fish, R. H.

    1970-01-01

    The development of fire-retardant coatings to protect surfaces which may be exposed to fire or extreme heat is a subject of intense interest to many industries. A fire-retardant paint has been developed which represents a new chemical approach for preparing intumescent coatings, and potentially, is very important to fire-prevention authorities. The requirements for a superior coating include ease of application, suitability to a wide variety of surfaces and finishes, and stability over an extended period of time within a broad range of ambient temperature and humidity conditions. These innovative coatings, when activated by the heat of a fire, react to form a thick, low-density, polymeric coating or char layer. Water vapor and sulphur dioxide are released during the intumescent reaction. Two fire-protection mechanisms thus become available: (1) the char layer retards the flow of heat, due to the extremely low thermal conductivity; and (2) water vapor and sulfur dioxide are released, providing fire quenching properties. Still another mechanism functions in cases where the char, by virtue of its high oxidation resistance and low thermal conductivity, reaches a sufficiently high temperature to re-radiate much of the incident heat load. The coatings consist of dispersions of selective salts of a nitro-amino-arornatic compound. Specifically, para-nitroaniline bisulfate and the ammonium salt of para-nitroaniline-ortho sulphuric acid (2-amino-5-nitrobenzenesulphuric acid) are used. Suitable vehicles are cellulose nitrate of lacquer grade, a nitrite-phenolic modified rubber, or epoxy-polysulfide copolymer. Three separate formulations have been developed. A solvent is usually employed, such as methylethyl ketone, butyl acetate, or toluene, which renders the coatings suitably thin and which evaporates after the coatings are applied. Generally, the intumescent material is treated as insoluble in the vehicle, and is ground and dispersed in the vehicle and solvent like an

  2. Inhomogeneous interface laser mirror coatings.

    Science.gov (United States)

    Ledger, A M

    1979-09-01

    Methods of improving the durability of thin-film laser mirror coatings for 10.6 microm using thorium fluoride, zinc selenide, and zinc sulfide materials have been investigated. The largest improvement in film durability was obtained by using inhomogeneous interface fabrication for all the dielectric-dielectric interfaces and by incorporating cerium fluoride protective overcoating material into the film design. Experimental results are given for enhanced reflectors, polarization-selective coatings, and buried-grating aperture-sharing coatings designed for high-power laser applications.

  3. Laser-based coatings removal

    Energy Technology Data Exchange (ETDEWEB)

    Freiwald, J.G.; Freiwald, D.A. [F2 Associates, Inc., Albuquerque, NM (United States)

    1995-10-01

    Over the years as building and equipment surfaces became contaminated with low levels of uranium or plutonium dust, coats of paint were applied to stabilize the contaminants in place. Most of the earlier paint used was lead-based paint. More recently, various non-lead-based paints, such as two-part epoxy, are used. For D&D (decontamination and decommissioning), it is desirable to remove the paints or other coatings rather than having to tear down and dispose of the entire building. This report describes the use of pulse-repetetion laser systems for the removal of paints and coatings.

  4. 憎水剂对钢铁表面不同涂层破损处的修复行为研究%Study of the Restoration Behavior of Breakage of Different Coatings on the Surface of Steel by a Hydrophobic Agent

    Institute of Scientific and Technical Information of China (English)

    陈袁; 李卫平; 刘慧丛; 朱立群

    2012-01-01

    Surface coatings of aircraft components can possibly be broken and scratched during assembly and transportation, and gap junctions of some fitting parts are channels of corrosion medium's erosion and sensitive areas of corrosion. The restoration behaviors of the hydrophobic agent (BH-102) used in aircraft components for the breakages of three basic coatings (the epoxy silicone coating, the polyurethane coating and the AV15 coating) are investigated. Furthermore, the corrosion properties of coatings after restoration are also researched under the neutral salt spray environment and the hy-drothermal environment. Results are presented that hydrophobic layer which can effectively prevent corrosion at coating breakage areas formed on the restoration areas of basic coatings. The restoration effect (anti-corrosion property) on the AV15 coating breakage is better than the other two coating-breakages by the hydrophobic agent, and that is because the hydrophobic agent can cause synergistic effect with the film formers and the inhibitor components of AV15 coating.%飞机部件在组装、运输等过程中易造成表面涂层的破损划伤,一些零部件的连接形成的缝隙等都是环境介质侵蚀的通道和发生腐蚀的敏感区域.为此以环氧有机硅涂层、聚氨酯涂层、AV15涂层(国外产品)为基础,用航空零件用憎水剂(BH-102)对涂层破损划伤处进行修复,考察了修复后的涂层在中性盐雾、湿热环境中的腐蚀特性.结果表明:憎水剂在这三种涂层的破损划伤处修复都能得到具有明显憎水效果的表面膜层,可以有效抑制破损划伤处的腐蚀过程;相比憎水剂对环氧有机硅涂层、聚氨酯涂层破损处的修复来说,憎水剂对AV15涂层的修复效果(防腐蚀性能)优异是因为憎水剂与这种涂层中的成膜物和阻蚀成分产生协同作用的缘故.

  5. A novel trilayer antireflection coating using dip-coating technique

    Institute of Scientific and Technical Information of China (English)

    Jian Xu; Yi Yin; Haiming Ma; Hui Ye; Xu Liu

    2011-01-01

    We report a new structure for broadband antireflection coating by dip-coating technique,which has minimal cost and is compatible with large-scale manufacturing.The coatings are prepared by depositing SiO2 sol-gel film on a glass substrate,subsequently depositing SiO2 single-layer particle coating through electrostatic attraction,and depositing a final very thin Si02 sol-gel film to improve the mechanical strength of the whole coating structure.The refractive index of the structure changes gradually from the top to the substrate.The transmittance of a glass substrate has been experimentally found to be improved in the spectral range of 400-1400 nn and in the incidence angle range from 0° to at least 45°.The mechanical strength is immensely improved because of the additional thin Si02 sol-gel layer.The surface texture can be applied to the substrates of different materials and shapes as an add-on coating.

  6. Water permeability of pigmented waterborne coatings

    NARCIS (Netherlands)

    Donkers, P.A.J.; Huinink, H.P.; Erich, S.J.F.; Reuvers, N.J.W.; Adan, O.C.G.

    2013-01-01

    Coatings are used in a variety of applications. Last decades more and more coating systems are transforming from solvent to waterborne coating systems. In this study the influence of pigments on the water permeability of a waterborne coating system is studied, with special interest in the possible i

  7. Sustainability of renewable fuel infrastructure: a screening LCA case study of anticorrosive graphene oxide epoxy liners in steel tanks for the storage of biodiesel and its blends.

    Science.gov (United States)

    Chilkoor, Govinda; Upadhyayula, Venkata K K; Gadhamshetty, Venkataramana; Koratkar, Nikhil; Tysklind, Mats

    2017-02-22

    Biodiesel is a widely used fuel that meets the renewable fuel standards developed under the Energy Policy Act of 2005. However, biodiesel is known to pose a series of abiotic and biotic corrosion risks to storage tanks. A typical practice (incumbent system) used to protect the tanks from these risks include (i) coating the interior surface of the tank with a solvent-free epoxy (SFE) liner, and (ii) adding a biocide to the tank. Herein, we present a screening-level life-cycle assessment study to compare the environmental performance of a graphene oxide (GO)-epoxy (GOE) liner with the incumbent system. TRACI was used as an impact assessment tool to model the midpoint environmental impacts in ten categories: global warming potential (GWP, kg CO2 eq.); acidification potential (AP, kg SO2 eq.); potential human health damage impacts due to carcinogens (HH-CP, CTUh) and non-carcinogens (HH-NCP, CTUh); potential respiratory effects (REP, kg PM2.5 eq.); eutrophication potential (EP, kg N eq.); ozone depletion potential (ODP kg CFC-11 eq.); ecotoxicity potential (ETXP, CTUe); smog formation potential (SFP kg O3 eq.) and fossil fuel depletion potential (FFDP MJ surplus). The equivalent functional unit of the LCA study was designed to protect 30 m(2) of the interior surface (unalloyed steel sheet) of a 10 000 liter biodiesel tank against abiotic and biotic corrosion during its service life of 20 years. Overall, this LCA study highlights the improved environmental performance for the GOE liner compared to the incumbent system, whereby the GOE liner showed 91% lower impacts in ODP impact category, 59% smaller in REP, 62% smaller in AP, 67-69% smaller in GWP and HH-CP, 72-76% smaller in EP, SFP, and FFDP, and 81-83% smaller ETXP and HH-NCP category results. The scenario analysis study revealed that these potential impacts change by less than 15% when the GOE liners are functionalized with silanized-GO nanosheets or GO-reinforced polyvinyl carbazole to improve the antimicrobial

  8. Overlay metallic-cermet alloy coating systems

    Science.gov (United States)

    Gedwill, M. A.; Levine, S. R.; Glasgow, T. K. (Inventor)

    1984-01-01

    A substrate, such as a turbine blade, vane, or the like, which is subjected to high temperature use is coated with a base coating of an oxide dispersed, metallic alloy (cermet). A top coating of an oxidation, hot corrosion, erosion resistant alloy of nickel, cobalt, or iron is then deposited on the base coating. A heat treatment is used to improve the bonding. The base coating serves as an inhibitor to interdiffusion between the protective top coating and the substrate. Otherwise, the protective top coating would rapidly interact detrimentally with the substrate and degrade by spalling of the protective oxides formed on the outer surface at elevated temperatures.

  9. Protective coatings for commercial particulates

    DEFF Research Database (Denmark)

    Kindl, B.; Teng, Y.H.; Liu, Y.L.

    1994-01-01

    SiC/Al composites are in large-scale production with Al-Si alloy matrices. The same composites with pure Al or low Si matrices need diffusion barriers on the SiC reinforcement to control the interfacial reaction. The present paper describes various approaches taken to obtain protective coatings...... of alumina and zirconia on SiC particulates by sol-gel techniques. Aqueous and organic precursors have been used. The extent of the reaction, i.e., the Si and Al4C3 content in the matrix, was determined by differential thermal analysis and X-ray diffraction. The reaction rates of some coated particulates...... in liquid Al are decreased by as much as one order of magnitude during the first 15 min of immersion. Pretreatments of the SiC surface, the composition and thickness of the coating interphase and heat treatments of the coated materials have been studied, and are discussed in relation to their effect...

  10. DLC coatings for hydraulic applications

    Institute of Scientific and Technical Information of China (English)

    Luca NOBILI; Luca MAGAGNIN

    2009-01-01

    Replacement of lubricating oils with water or low-viscosity fluids is highly desirable in many industrial fields, on account of the environmental and economical advantages. Low lubricity of water might be insufficient for proper operation of hydraulic components, and diamond-like carbon(DLC) coatings are very attractive as solid lubricant films. A remote-plasma PACVD process was utilized to deposit hydrogenated DLC coatings (a-C:H) on different substrates. Microindentation measurements show that the coating hardness is around 35 GPa. Tribological behavior was evaluated by block-on-ring tests performed in water and water with alumina. The wear rate was calculated after measuring the wear volume by a laser profilemeter. Morphological and compositional analysis of the wear tracks reveal that coating failure may occur by abrasive wear or delamination, depending on the substrate properties. Hard and smooth substrates give the best results and dispersed alumina particles increase the wear rate.

  11. Corrosion-resistant metallic coatings

    Directory of Open Access Journals (Sweden)

    F. Presuel-Moreno

    2008-10-01

    Full Text Available We describe recent computational and experimental studies on the corrosion properties of metallic coatings that can be tailored (tuned to deliver up to three corrosion-inhibiting functions to an underlying substrate. Attributes are tuned by a selection of alloy compositions and nanostructures, ideally in alloy systems that offer flexibility of choice to optimize the corrosion-resisting properties. An amorphous Al-based coating is tuned for corrosion protection by on-demand release of ionic inhibitors to protect defects in the coating, by formation of an optimized barrier to local corrosion in Cl− containing environments, as well as by sacrificial cathodic prevention. Further progress in this field could lead to the design of the next generation of adaptive or tunable coatings that inhibit corrosion of underlying substrates.

  12. Smart Coatings for Corrosion Protection

    Science.gov (United States)

    Calle, Luz Marina; Li, Wendy; Buhrow, Jerry W.; Johnsey, Marissa N.

    2016-01-01

    Nearly all metals and their alloys are subject to corrosion that causes them to lose their structural integrity or other critical functionality. It is essential to detect corrosion when it occurs, and preferably at its early stage, so that action can be taken to avoid structural damage or loss of function. Protective coatings are the most commonly used method of corrosion control. However, progressively stricter environmental regulations have resulted in the ban of many commercially available corrosion protective coatings due to the harmful effects of their solvents or corrosion inhibitors. This work concerns the development of a multifunctional, smart coating for the autonomous control of corrosion. This coating is being developed to have the inherent ability to detect the chemical changes associated with the onset of corrosion and respond autonomously to indicate it and control it.

  13. Cementless Hydroxyapatite Coated Hip Prostheses

    Directory of Open Access Journals (Sweden)

    Antonio Herrera

    2015-01-01

    Full Text Available More than twenty years ago, hydroxyapatite (HA, calcium phosphate ceramics, was introduced as a coating for cementless hip prostheses. The choice of this ceramic is due to its composition being similar to organic apatite bone crystals. This ceramic is biocompatible, bioactive, and osteoconductive. These qualities facilitate the primary stability and osseointegration of implants. Our surgical experience includes the implantation of more than 4,000 cementless hydroxyapatite coated hip prostheses since 1990. The models implanted are coated with HA in the acetabulum and in the metaphyseal area of the stem. The results corresponding to survival and stability of implants were very satisfactory in the long-term. From our experience, HA-coated hip implants are a reliable alternative which can achieve long term survival, provided that certain requirements are met: good design selection, sound choice of bearing surfaces based on patient life expectancy, meticulous surgical technique, and indications based on adequate bone quality.

  14. Low Temperature Cure Powder Coatings

    Science.gov (United States)

    2013-05-01

    within the JTP. These requirements included a final coating thickness range, a minimum product shelf life, and finished surface quality as measured...additional drawbacks of PC technology. Technology innovations such as Ultraviolet ( UV ) curable powders, which are not constrained by physical oven size due... Thickness Film thickness measurements were also taken from the same color measurement locations across each component’s coated surface. During field

  15. Hermetic Coating of Optical Fibers

    Science.gov (United States)

    1987-11-01

    of 450A/min. A number of bulk samples were coated with a-C:H including microscope slides, NaCl plates, ZBLAN fluoride glass and sapphire blanks. IR...deposition were identified. Bulk NaCl, sapphire and glass samples coated with - 1 micron thick films were tested analytically. With the information gathered...1.0 INTRODUCTION: The surface of a freshly drawn glass fiber while seemingly smooth has many imperfections which when under stress, can grow and

  16. Corrosion resistant neutron absorbing coatings

    Science.gov (United States)

    Choi, Jor-Shan [El Cerrito, CA; Farmer, Joseph C [Tracy, CA; Lee, Chuck K [Hayward, CA; Walker, Jeffrey [Gaithersburg, MD; Russell, Paige [Las Vegas, NV; Kirkwood, Jon [Saint Leonard, MD; Yang, Nancy [Lafayette, CA; Champagne, Victor [Oxford, PA

    2012-05-29

    A method of forming a corrosion resistant neutron absorbing coating comprising the steps of spray or deposition or sputtering or welding processing to form a composite material made of a spray or deposition or sputtering or welding material, and a neutron absorbing material. Also a corrosion resistant neutron absorbing coating comprising a composite material made of a spray or deposition or sputtering or welding material, and a neutron absorbing material.

  17. Corrosion-resistant metallic coatings

    OpenAIRE

    F. Presuel-Moreno; M.A. Jakab; N. Tailleart; Goldman, M.; J. R. Scully

    2008-01-01

    We describe recent computational and experimental studies on the corrosion properties of metallic coatings that can be tailored (tuned) to deliver up to three corrosion-inhibiting functions to an underlying substrate. Attributes are tuned by a selection of alloy compositions and nanostructures, ideally in alloy systems that offer flexibility of choice to optimize the corrosion-resisting properties. An amorphous Al-based coating is tuned for corrosion protection by on-demand release of ionic i...

  18. Material Science Smart Coatings

    Energy Technology Data Exchange (ETDEWEB)

    Rubinstein, A. I. [Univ. of Nebraska Medical Center, Omaha, NE (United States); Sabirianov, R. F. [Univ. of Nebraska Medical Center, Omaha, NE (United States); Namavar, Fereydoon [Univ. of Nebraska Medical Center, Omaha, NE (United States)

    2014-07-01

    The contribution of electrostatic interactions to the free energy of binding between model protein and a ceramic implant surface in the aqueous solvent, considered in the framework of the nonlocal electrostatic model, is calculated as a function of the implant low-frequency dielectric constant. We show that the existence of a dynamically ordered (low-dielectric) interfacial solvent layer at the protein-solvent and ceramic-solvent interface markedly increases charging energy of the protein and ceramic implant, and consequently makes the electrostatic contribution to the protein-ceramic binding energy more favorable (attractive). Our analysis shows that the corresponding electrostatic energy between protein and oxide ceramics depends nonmonotonically on the dielectric constant of ceramic, εC. Obtained results indicate that protein can attract electrostatically to the surface if ceramic material has a moderate εC below or about 35 (in particularly ZrO2 or Ta2O5). This is in contrast to classical (local) consideration of the solvent, which demonstrates an unfavorable electrostatic interaction of protein with typical metal oxide ceramic materials (εC>10). Thus, a solid implant coated by combining oxide ceramic with a reduced dielectric constant can be beneficial to strengthen the electrostatic binding of the protein-implant complex.

  19. Composite hydrophilic coating for conditioner aluminum fins

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    To solve the so-called "white rust" and 'water bridge" problems of the aluminum fins for heat exchanger of automobile air conditioner, aimed at nationalizing the art of hydrophilic coating technology, the choice of coating forming and curing materials was investigated. By measuring the water contact angle, SEM surface scanning and ingredients analysis of the coating, optimal parameters and composition are acquired. The coating forming mechanisms of the composition was also expatiated. The coating obtained has good hydrophilic and other properties.

  20. Switchable antifouling coatings and uses thereof

    Energy Technology Data Exchange (ETDEWEB)

    Denton, Michele L. Baca; Dirk, Shawn M.; Johnson, Ross Stefan

    2017-02-28

    The present invention relates to antifouling coatings capable of being switched by using heat or ultraviolet light. Prior to switching, the coating includes an onium cation component having antimicrobial and antibacterial properties. Upon switching, the coating is converted to a conjugated polymer state, and the cationic component is released with any adsorbed biofilm layer. Thus, the coatings herein have switchable and releasable properties. Methods of making and using such coatings are also described.

  1. Coating, Titanium Dioxide and Solar Cell

    OpenAIRE

    Yang, Aohan

    2011-01-01

    The objective of this bachelor’s thesis is to get basic ideas about coating and a deep understanding of properties of titanium dioxide pigments as well as their application and performance in solar electricity energy technology. This thesis consists of three main parts, eight chapters. The first part is about basic knowledge of coating and tests of coated paper. Coating pigments are generally introduced in the part. In the second part, coating additives are introduced in details from ...

  2. Graphene: corrosion-inhibiting coating.

    Science.gov (United States)

    Prasai, Dhiraj; Tuberquia, Juan Carlos; Harl, Robert R; Jennings, G Kane; Rogers, Bridget R; Bolotin, Kirill I

    2012-02-28

    We report the use of atomically thin layers of graphene as a protective coating that inhibits corrosion of underlying metals. Here, we employ electrochemical methods to study the corrosion inhibition of copper and nickel by either growing graphene on these metals, or by mechanically transferring multilayer graphene onto them. Cyclic voltammetry measurements reveal that the graphene coating effectively suppresses metal oxidation and oxygen reduction. Electrochemical impedance spectroscopy measurements suggest that while graphene itself is not damaged, the metal under it is corroded at cracks in the graphene film. Finally, we use Tafel analysis to quantify the corrosion rates of samples with and without graphene coatings. These results indicate that copper films coated with graphene grown via chemical vapor deposition are corroded 7 times slower in an aerated Na(2)SO(4) solution as compared to the corrosion rate of bare copper. Tafel analysis reveals that nickel with a multilayer graphene film grown on it corrodes 20 times slower while nickel surfaces coated with four layers of mechanically transferred graphene corrode 4 times slower than bare nickel. These findings establish graphene as the thinnest known corrosion-protecting coating.

  3. Polyester based hybrid organic coatings

    Science.gov (United States)

    Wang, Xiaojiang

    Polyesters are a class of polymers widely used in organic coatings applications. In this work, four types of organic coatings based on polyester polyols were prepared: UV-curable polyester/poly(meth)acrylate coatings, thermal curable polyester polyurethane-urea coatings, thermal curable non-isocyanate polyurethane coatings, and UV-curable non-isocyanate polyurethane coatings. Polyester/poly(meth)acrylate block copolymers are synthesized using a combination of polycondensation and Atom-Transfer Radical Polymerization (ATRP). All block copolymers are characterized by means of Nuclear Magnetic Resonance (NMR) and Gel Permeation Chromatography (GPC). In the case of unsaturated-polyester-based block copolymers the main chain double bond in the polyester backbone remains almost unaffected during ATRP. The unsaturated block copolymers are crosslinkable and can form networks upon photo-irradiation in the presence of a suitable photoinitiator. These copolymers might be interesting candidates for coatings with better overall properties than those based on neat polyesters. Thermal curable polyester polyol based Polyurethane-Urea (PUU) coatings were formulated using Partially Blocked HDI isocyanurate (PBH), Isophorone Diamine (IPDA), and polyester polyol. As a comparison, the polyurethane coatings (PU) without adding IPDA were also prepared. The mechanical and viscoelastic properties of the PUU and PU coating were investigated by using tensile test and Dynamic Mechanical Thermal Analyzer (DMTA). It was found that PUU coating exhibited higher crosslink density, Tg, tensile modulus and strength than the corresponding PU coating. Thermal curable non-isocyanate polyurethane coatings were prepared by using polyamine and cyclic carbonate terminated polyester. Cyclic carbonate terminated polyester was synthesized from the reaction of the carbon dioxide and epoxidized polyester which was prepared from the polyester polyol. The properties of the epoxidized and cyclic carbonate

  4. Coatings and Tints of Spectacle Lenses

    Directory of Open Access Journals (Sweden)

    H. Zeki Büyükyıldız

    2012-10-01

    Full Text Available Spectacle lenses are made of mineral or organic (plastic materials. Various coatings and tints are applied to the spectacle lenses according to the characteristic of the lens material, and for the personal needs and cosmetic purpose. The coatings may be classified in seven groups: 1 Anti-reflection coatings, 2 Hard coatings, 3 Clean coat, 4 Mirror coatings, 5 Color tint coating (one of coloring processes, 6 Photochromic coating (one of photochromic processes, and 7 Anti-fog coatings. Anti-reflection coatings reduce unwanted reflections from the lens surfaces and increase light transmission. Hard coatings are applied for preventing the plastic lens surface from scratches and abrasion. Hard coatings are not required for the mineral lenses due to their hardness. Clean coat makes the lens surface smooth and hydrophobic. Thus, it prevents the adherence of dust, tarnish, and dirt particles on the lens surface. Mirror coatings are applied onto the sunglasses for cosmetic purpose. Color tinted and photochromic lenses are used for sun protection and absorption of the harmful UV radiations. Anti-fog coatings make the lens surface hydrophilic and prevent the coalescence of tiny water droplets on the lens surface that reduces light transmission. (Turk J Ophthalmol 2012; 42: 359-69

  5. Analysis and Experiment Research on Dehumidification and Anti-corrosion System of Main Cable of Suspension Bridge Based on Waste Heat Recovery%基于余热回收的悬索桥主缆除湿防腐系统节能分析与实验研究

    Institute of Scientific and Technical Information of China (English)

    彭关中; 缪小平; 范良凯; 贾代勇; 刘文杰; 马喜斌

    2011-01-01

    Main cable is one of the most important bearing components of suspension bridge, and also the irreplaceable component, known as the “lifeline” of the suspension bridge. The main cable is exposed to the atmosphere for a long time, and withstands the erosion of various adverse environments, which results in the rust and corrosion of steel wire of main cable. The dehumidification and anti-corrosion system will send dry air into the main cable,reduce the air relative humidity,so as to avoid rust and corrosion of steel wire, and improve the service life. In this paper, the principle and composition of the dehumidification and anticorrosion system of main cable were described, and a dehumidification and anti-corrosion system of main cable of suspension bridge based on the waste heat recovery was proposed. The test rig for testing the performance of heat exchanger was built up, and the experiment results indicated that when the regenerated air flowrate of the rotary dehumidifier was 1/3 of the rotary dehumidification air flowrate,with the increase of the rotary dehumidification air flowrate, the heat exchange efficiency of the heat exchanger would be improved,the temperature of the regenerated air would rise through the heat exchanger, which would reduce the heating capacity of regeneration electric heater, and save the energy consumption of the dehumidification and anti-corrosion system of main cable.Therefore, the waste beat recovery technology was favorable for the energy conservation of the dehumidification and anti-corrosion system of main cable.%主缆是悬索桥最重要的受力构件之一,且是不可更换构件,被称为悬索桥的"生命线".主缆长期暴露在大气环境中,经受着各种不利环境的侵蚀,导致主缆钢丝易产生锈蚀.主缆除湿防腐系统将干燥空气送入主缆,降低主缆内的空气湿度,从而避免主缆钢丝锈蚀.提高了主缆钢丝的使用寿命.本文阐述了主缆除湿防腐系统的原理及组

  6. Structure and characterization of Sn, Al co-doped zinc oxide thin films prepared by sol–gel dip-coating process

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Min-I [Institute of Materials Science and Engineering, National Central University, Taiwan (China); Laboratoire de Nanotechnologie et d' Instrumentation Optique, Institut Charles Delaunay, CNRS - UMR STMR 6279, Université de Technologie de Troyes (France); Huang, Mao-Chia [Institute of Materials Science and Engineering, National Central University, Taiwan (China); Legrand, David [Institute of Materials Science and Engineering, National Central University, Taiwan (China); Laboratoire de Nanotechnologie et d' Instrumentation Optique, Institut Charles Delaunay, CNRS - UMR STMR 6279, Université de Technologie de Troyes (France); Lerondel, Gilles [Laboratoire de Nanotechnologie et d' Instrumentation Optique, Institut Charles Delaunay, CNRS - UMR STMR 6279, Université de Technologie de Troyes (France); Lin, Jing-Chie, E-mail: jclin4046@gmail.com [Institute of Materials Science and Engineering, National Central University, Taiwan (China)

    2014-11-03

    Transparent conductive zinc oxide co-doped with tin and aluminum (TAZO) thin films were prepared via sol–gel dip-coating process. Non-toxic ethanol was used in this study instead of 2-methoxyethanol used in conventional work. Dip-coating was repeated several times to obtain relatively thick films consisting of six layers. The films were then annealed at 500 °C for 1 h in air or in vacuum and not subsequently as employed in other studies. The X-ray diffraction patterns indicated that all the samples revealed a single phase of hexagonal ZnO polycrystalline structure with a main peak of (002). The optical band gap and resistivity of the TAZO films were in the ranges of 3.28 to 3.32 eV and 0.52 to 575.25 Ω cm, respectively. The 1.0 at.% Sn, 1.0 at.% Al co-doped ZnO thin film annealed in vacuum was found to have a better photoelectrochemical performance with photocurrent density of about 0.28 mA/cm{sup 2} at a bias of 0.5 V vs. SCE under a 300 W Xe lamp illumination with the intensity of 100 mW/cm{sup 2}. Compared to the same dopant concentration but annealed in air (∼ 0.05 mA/cm{sup 2} bias 0.5 V vs. SCE), the photocurrent density of the film annealed in vacuum was 5 times higher than the film annealed in air. Through electrochemical measurements, we found that the dopant concentration of Sn plays an important role in TAZO that affected photocurrent density, stability of water splitting and anti-corrosion. - Highlights: • Al, Sn co-doped ZnO (TAZO) films was synthesized by sol–gel process. • The parameters of TAZO films were dopant concentration and annealed ambient. • The photoelectrochemical characteristics of TAZO films were investigated.

  7. Coating Carbon Fibers With Platinum

    Science.gov (United States)

    Effinger, Michael R.; Duncan, Peter; Coupland, Duncan; Rigali, Mark J.

    2007-01-01

    A process for coating carbon fibers with platinum has been developed. The process may also be adaptable to coating carbon fibers with other noble and refractory metals, including rhenium and iridium. The coated carbon fibers would be used as ingredients of matrix/fiber composite materials that would resist oxidation at high temperatures. The metal coats would contribute to oxidation resistance by keeping atmospheric oxygen away from fibers when cracks form in the matrices. Other processes that have been used to coat carbon fibers with metals have significant disadvantages: Metal-vapor deposition processes yield coats that are nonuniform along both the lengths and the circumferences of the fibers. The electrical resistivities of carbon fibers are too high to be compatible with electrolytic processes. Metal/organic vapor deposition entails the use of expensive starting materials, it may be necessary to use a furnace, and the starting materials and/or materials generated in the process may be hazardous. The present process does not have these disadvantages. It yields uniform, nonporous coats and is relatively inexpensive. The process can be summarized as one of pretreatment followed by electroless deposition. The process consists of the following steps: The surfaces of the fiber are activated by deposition of palladium crystallites from a solution. The surface-activated fibers are immersed in a solution that contains platinum. A reducing agent is used to supply electrons to effect a chemical reduction in situ. The chemical reduction displaces the platinum from the solution. The displaced platinum becomes deposited on the fibers. Each platinum atom that has been deposited acts as a catalytic site for the deposition of another platinum atom. Hence, the deposition process can also be characterized as autocatalytic. The thickness of the deposited metal can be tailored via the duration of immersion and the chemical activity of the solution.

  8. Kinetic regulation of coated vesicle secretion

    CERN Document Server

    Foret, Lionel

    2008-01-01

    The secretion of vesicles for intracellular transport often rely on the aggregation of specialized membrane-bound proteins into a coat able to curve cell membranes. The nucleation and growth of a protein coat is a kinetic process that competes with the energy-consuming turnover of coat components between the membrane and the cytosol. We propose a generic kinetic description of coat assembly and the formation of coated vesicles, and discuss its implication to the dynamics of COP vesicles that traffic within the Golgi and with the Endoplasmic Reticulum. We show that stationary coats of fixed area emerge from the competition between coat growth and the recycling of coat components, in a fashion resembling the treadmilling of cytoskeletal filaments. We further show that the turnover of coat components allows for a highly sensitive switching mechanism between a quiescent and a vesicle producing membrane, upon a slowing down of the exchange kinetics. We claim that the existence of this switching behaviour, also tri...

  9. Design of Polymer Coatings in Automotive Engines

    Institute of Scientific and Technical Information of China (English)

    LIAO Han-lin; ZHANG Ga; BORDES Jean-Michel; CHRISTIAN Coddet

    2004-01-01

    Driven by economical and ecological reasons, thermoplastics based coatings were more and more used in automotive engines. Two design concepts, flame spraying and serigraphy PEEK coatings on light metal substrate, were introduced in this paper. The friction and wear behavior of PEEK based coatings were investigated systematically. Coatings with different crystallinities can be obtained when cooling speed is controlled. Among three sprayed coatings considered with different crystallinities, the one with highest crystallinity exhibits best friction and wear behavior under dry sliding condition. Under lubricated sliding condition, however, the amorphous coating gives lower friction coefficient. The micron particles such as SiC,MoS2 and graphite in composite coatings can improve significantly the coating wear resistance and have a impact on coating friction behavior.

  10. Microstructure and Residual Stress of Shot Coating

    Science.gov (United States)

    Itoh, Yoshiyasu; Suyama, Shoko; Fuse, Toshiaki

    A shot coating process for metalizing at the surface of ceramics has been newly developed as the shot peening treatment. However, microstructure and residual stress of shot coatings, which have an important effect on the adherent strength of coatings and the strength of ceramic substrates, have not always been clarified. An experimental investigation on the microstructure and residual stress was carried out for the shot coating of aluminum on zinc-oxide substrate by comparison with the atmospheric plasma sprayed aluminum coatings. As a result, low porosity, low oxide content and flat surface could be obtained from the aluminum coatings formed by shot coating process in comparison with the atmospheric plasma sprayed aluminum coatings. Also, it was confirmed by the X-ray diffraction technique that the residual stress of shot coated aluminum over zinc-oxide substrate was high compressive in comparison with the atmospheric plasma spraying process.

  11. Sputtering process and apparatus for coating powders

    Science.gov (United States)

    Makowiecki, Daniel M.; Kerns, John A.; Alford, Craig S.; McKernan, Mark A.

    2002-01-01

    A process and apparatus for coating small particles and fibers. The process involves agitation by vibrating or tumbling the particles or fibers to promote coating uniformly, removing adsorbed gases and static charges from the particles or fibers by an initial plasma cleaning, and coating the particles or fibers with one or more coatings, a first coating being an adhesion coating, and with subsequent coatings being deposited in-situ to prevent contamination at layer interfaces. The first coating is of an adhesion forming element (i.e. W, Zr, Re, Cr, Ti) of a 100-10,000 .ANG. thickness and the second coating or final coating of a multiple (0.1-10 microns) being Cu or Ag, for example for brazing processes, or other desired materials that defines the new surface related properties of the particles. An essential feature of the coating process is the capability to deposit in-situ without interruption to prevent the formation of a contaminated interface that could adversely affect the coating adhesion. The process may include screening of the material to be coated and either continuous or intermittent vibration to prevent agglomeration of the material to be coated.

  12. Vertebrate extracellular preovulatory and postovulatory egg coats.

    Science.gov (United States)

    Menkhorst, Ellen; Selwood, Lynne

    2008-11-01

    Extracellular egg coats deposited by maternal or embryonic tissues surround all vertebrate conceptuses during early development. In oviparous species, the time of hatching from extracellular coats can be considered equivalent to the time of birth in viviparous species. Extracellular coats must be lost during gestation for implantation and placentation to occur in some viviparous species. In the most recent classification of vertebrate extracellular coats, Boyd and Hamilton (Cleavage, early development and implantation of the egg. In: Parkes AS (ed.), Marshall's Physiology of Reproduction, vol. 2, 3rd ed. London: Longmans, Green & Co; 1961:1-126) defined the coat synthesized by the oocyte during oogenesis as primary and the coat deposited by follicle cells surrounding the oocyte as secondary. Tertiary egg coats are those synthesized and deposited around the primary or secondary coat by the maternal reproductive tract. This classification is difficult to reconcile with recent data collected using modern molecular biological techniques that can accurately establish the site of coat precursor synthesis and secretion. We propose that a modification to the classification by Boyd and Hamilton is required. Vertebrate egg coats should be classed as belonging to the following two broad groups: the preovulatory coat, which is deposited during oogenesis by the oocyte or follicle cells, and the postovulatory coats, which are deposited after fertilization by the reproductive tract or conceptus. This review discusses the origin and classification of vertebrate extracellular preovulatory and postovulatory coats and illustrates what is known about coat homology between the vertebrate groups.

  13. Coating Microstructure-Property-Performance Issues

    Energy Technology Data Exchange (ETDEWEB)

    Terry C. Totemeier; Richard N. Wright

    2005-05-01

    Results of studies on the relationships between spray parameters and performance of thermally-sprayed intermetallic coatings for high-temperature oxidation and corrosion resistance are presented. Coating performance is being assessed by corrosion testing of free-standing coatings, thermal cycling of coating substrates, and coating ductility measurement. Coating corrosion resistance was measured in a simulated coal combustion gas environment (N2-CO-CO2-H2O-H2S) at temperatures from 500 to 800°C using thermo-gravimetric analysis (TGA). TGA testing was also performed on a typical ferritic-martensitic steel, austenitic stainless steel, and a wrought Fe3Al-based alloy for direct comparison to coating behavior. FeAl and Fe3Al coatings showed corrosion rates slightly greater than that of wrought Fe3Al, but markedly lower than the steels at all temperatures. The corrosion rates of the coatings were relatively independent of temperature. Thermal cycling was performed on coated 316SS and nickel alloy 600 substrates from room temperature to 800°C to assess the relative effects of coating microstructure, residual stress, and thermal expansion mismatch on coating cracking by thermal fatigue. Measurement of coating ductility was made by acoustic emission monitoring of coated 316SS tensile specimens during loading.

  14. Diffusion Barrier Coating System and Oxidation Behavior of Coated Alloys

    Institute of Scientific and Technical Information of China (English)

    T.NARITA

    2009-01-01

    @@ 1 Introduction Research into the formation of Re-based alloys is in progress in our laboratory to provide a diffusion barrier layer between heat-resistant alloys and Al reservoir layers, which assist in the formation and maintenance a protective Al2O3 scale for long periods. Coatings with a two-layered structure comprised of inner Re-based alloy layer and outer β-NiAl layer with or without Pt addition were successfully formed on various heat resistant alloys such as Ni-based singlecrystal superalloys, Ni-based heat resistant alloys, NiMo based alloy, Ni-Cr based alloy, and Fe-based alloys. The duplex layer coating proposed is generally termed a diffusion barrier coating system; DBC system.

  15. 油田集输用塑料合金复合管管体爆裂分析%Failure Analysis of Anticorrosion Plastic Alloy Composite Pipe for Oil Gathering and Transportation

    Institute of Scientific and Technical Information of China (English)

    李循迹; 李厚补; 常泽亮; 戚东涛; 毛学强; 魏斌

    2014-01-01

    An anticorrosion plastic alloy composite pipe for oil gathering and transportation failed during service. Investigations were performed to identify the possible failure causes of the pipe. Composition and thermal analysis of inner plastic alloy and outer GRP resin were systematically studied by using FTIR, TG-DSC, VST, etc. Results reveal that additives in failed plastic alloy may have not been stirred enough before extrusion or the content of additives may exceed their normal range. The glass transition temperature of GRP resin was much lower than that stated in standard. Hence, the lower state of cure for resin as well as the higher resin content of GRP layer makes the outer GRP structural layer have a relatively lower mechanical property, giving rise to the final failure of the composite pipe after serving for a long time under the co-effect of the aging and corrosion.%集油管线用塑料合金复合管在使用过程中发生了管体爆裂失效事故。为了探讨复合管的失效原因,采用红外光谱分析、差热-热重分析、VST等分析手段,研究了复合管用内衬塑料层和外结构层玻璃钢树脂基体的结构成分、热性能等。结果表明:复合管内衬材料添加剂含量较多或分散不均,而复合管玻璃钢基体树脂的玻璃化转变温度远低于标准要求。较低的固化度和偏高的树脂含量导致玻璃钢结构层力学性能下降,在长期服役过程中的老化及介质腐蚀共同作用下,复合管最终爆裂失效。

  16. Testing and Evaluation of Multifunctional Smart Coatings

    Science.gov (United States)

    Buhrow, Jerry; Li, Wenyan; Jolley, Scott; Calle, Luz M.; Pearman, Benjamin; Zhang, Xuejun

    2015-01-01

    A smart coating system, based on pH sensitive microcontainers (microparticles and microcapsules) has been developed. Various corrosion inhibitors have been encapsulated and incorporated into commercial and formulated coatings to test the functionality imparted on the coating by the incorporation of the inhibitor microcontainers. Coated carbon steel and aluminum alloy panels were tested using salt immersion, salt fog, and coastal atmospheric exposure conditions. This paper provides the details on coating sample preparation, evaluation methods, as well as test results of the inhibiting function of smart coatings.

  17. Chromate conversion coatings and their current application

    Directory of Open Access Journals (Sweden)

    P. Pokorny

    2016-04-01

    Full Text Available This paper describes formation, composition and possible production technologies of application chromate coatings. Summation of common examples of applications of these coatings in corrosion protection of metals and alloys is provided. Individual chromate coatings are divided by their dominant anions either with CrVI or CrIII. Restrictions of chromate coatings with dominantly CrVI and related toxicity of hexavalent chromium is discussed in detail. In conclusion, examples of both chromium and other, alternative coatings are summed up. Application of these coatings as a protection for concrete hot-dip galvanized reinforcement is also reviewed.

  18. Structure and Property of Micro-arc Oxidation Coating Modified by Laser Melting and Solidifying on Aluminum Alloy%激光重熔改性铝合金微弧氧化膜层的组织与性能

    Institute of Scientific and Technical Information of China (English)

    喻杰; 韦东波; 王岩; 吕鹏翔; 狄士春

    2013-01-01

    为了改善微弧氧化(MAO)膜层多孔疏松的组织和性能,对其进行了激光重熔处理,并制备了两种实验膜层:(1)选择双向电流脉冲和Na2SiO3-KOH体系的工作液,在6082铝合金基体上制备平均厚度为18 μm的MAO膜层;(2)采用Nd∶YAG激光器对上述MAO膜层进行激光重熔(LSM)处理,获得MAO+LSM膜层.利用扫描电子显微镜(SEM)、X射线衍射仪、超显微硬度计和电化学分析仪分别检测上述两种膜层的微观形貌、相组成、表面硬度和耐蚀性能.结果表明:激光重熔后的膜层由内往外分为致密层、中间层和重熔层,组织致密、气孔率低的重熔层取代了MAO疏松层,MAO+LSM膜层中α-Al2O3相的比例得到提高,硬度和耐蚀性能也进一步得到改善,且保持了MAO膜层与基体的结合方式.%In order to improve performance and microstructure of micro-arc oxidation (MAO) coating,especially loose and porous characteristic,a laser melting and solidifying process (LSM) was introduced.Two kinds of samples were prepared:(1) MAO coatings,18 μm average thickness,were produced on 6082 aluminum alloy by bipolar current pulse in Na2SiO3-KOH solution.(2) a melting process using a Nd∶YAG laser was employed to modify above-mentioned MAO coatings to obtain MAO+LSM coating.Microstructure of two kinds of coatings (MAO coating and MAO+LSM coating) were examined by scanning electron microscopy.X-ray diffraction was used to determine the phase composition of the coatings.Coating hardness was tested by ultra-micro hardness tester,and corrosion performance was investigated by polarization test instrument.The results show that the MAO+LSM coating is composed of dense layer,intermediate layer and melting layer from inside to surface.The loose layer of MAO film is replaced by a dense and low porosity melting layer after LSM treatment.The occupancy of α-Al2O3 phase in MAO+LSM is improved compared with MAO coating.Hardness and anticorrosion performance of MAO

  19. Mixed zirconia calcium phosphate coatings for dental implants: Tailoring coating stability and bioactivity potential

    Energy Technology Data Exchange (ETDEWEB)

    Pardun, Karoline [University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, 28359 Bremen (Germany); Treccani, Laura, E-mail: treccani@uni-bremen.de [University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, 28359 Bremen (Germany); Volkmann, Eike [University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, 28359 Bremen (Germany); Streckbein, Philipp [University Hospital, Justus-Liebig-University Giessen, Department of Cranio-Maxillo-Facial Surgery, Klinikstrasse 33, 35385 Giessen (Germany); Heiss, Christian [University Hospital of Giessen-Marburg, Department of Trauma Surgery, Rudolf-Buchheim-Strasse 7, 35385 Giessen, Germany, (Germany); Laboratory of Experimental Surgery, Kerkraderstrasse 9, 35392 Giessen (Germany); Destri, Giovanni Li; Marletta, Giovanni [Laboratory for Molecular Surfaces and Nanotechnology (LAMSUN), Department of Chemistry, University of Catania and CSGI, Viale A. Doria 6, 95125 Catania (Italy); Rezwan, Kurosch [University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, 28359 Bremen (Germany)

    2015-03-01

    Enhanced coating stability and adhesion are essential for long-term success of orthopedic and dental implants. In this study, the effect of coating composition on mechanical, physico-chemical and biological properties of coated zirconia specimens is investigated. Zirconia discs and dental screw implants are coated using the wet powder spraying (WPS) technique. The coatings are obtained by mixing yttria-stabilized zirconia (TZ) and hydroxyapatite (HA) in various ratios while a pure HA coating served as reference material. Scanning electron microscopy (SEM) and optical profilometer analysis confirm a similar coating morphology and roughness for all studied coatings, whereas the coating stability can be tailored with composition and is probed by insertion and dissections experiments in bovine bone with coated zirconia screw implants. An increasing content of calcium phosphate (CP) resulted in a decrease of mechanical and chemical stability, while the bioactivity increased in simulated body fluid (SBF). In vitro experiments with human osteoblast cells (HOB) revealed that the cells grew well on all samples but are affected by dissolution behavior of the studied coatings. This work demonstrates the overall good mechanical strength, the excellent interfacial bonding and the bioactivity potential of coatings with higher TZ contents, which provide a highly interesting coating for dental implants. - Highlights: • Different ratios of zirconia (TZ) and calcium phosphate (CP) were deposited on zirconia substrates. • Enhancement of TZ content in mixed coatings increased coating stability. • Enhancement of CP content in mixed coatings increased bioactivity. • All tested coating compositions were non-toxic.

  20. Dielectric Coatings for IACT Mirrors

    CERN Document Server

    Förster, A; Chadwick, P; Held, M

    2013-01-01

    Imaging Atmospheric Cherenkov Telescopes for very-high energy gamma-ray astronomy need mirror with high reflectance roughly in the wavelength between 300 and 550 nm. The current standard reflective layer of such mirrors is aluminum. Being permanently exposed to the environment they show a constant degradation over the years. New and improved dielectric coatings have been developed to enhance their resistance to environmental impact and to extend their possible lifetime. In addition, these customized coatings have an increased reflectance of over 95% and are designed to significantly lower the night-sky background contribution. The development of such coatings for mirrors with areas up to 2 m2 and low application temperatures to suite the composite materials used for the new mirror susbtrates of the Cherenkov Telescope Array (CTA) and the results of extensive durability tests are presented.

  1. Clean diffusion coatings by chemical vapor deposition

    Energy Technology Data Exchange (ETDEWEB)

    Warnes, B.M.; Punola, D.C. [Howmet Thermatech Coatings, Whitehall, MI (United States)

    1997-10-01

    An experimental program was undertaken to identify diffusion coating impurities introduced by standard aluminizing processes and to evaluate the impact of those impurities on oxidation resistance of the resultant Pt aluminide coating. IN-738 tabs and foils were platinum-electroplated, and then aluminized using three different processes: high-activity pack cementation, high-activity CVD and low-activity CVD. The results suggest that aluminizing processes which involve aluminum bearing alloys in the coating retort with H{sub 2} or H{sub 2}/HCl gas at high temperature can contaminate the diffusion coating during deposition. CVD low-activity aluminizing (coating gas generated at low temperature outside the coating chamber from 99.999% Al) did not introduce any coating impurities. In addition, the data indicates that harmful impurities from the IN-738 substrate (sulfur, boron and tungsten) and the electroplating process (phosphorus) were removed from the coating during deposition. The CVD low-activity Pt aluminide coating was the `cleanest` in the study, and it exhibited the best high-temperature oxidation resistance of the coatings considered. It can be concluded that trace elements in diffusion coatings from the superalloy substrate and/or the aluminizing process can adversely effect the oxidation resistance of those coatings, and that CVD low-activity aluminizing yields cleaner coatings than other commercially available aluminizing techniques. (orig.) 10 refs.

  2. Nano-Ceramic Coated Plastics

    Science.gov (United States)

    Cho, Junghyun

    2013-01-01

    Plastic products, due to their durability, safety, and low manufacturing cost, are now rapidly replacing cookware items traditionally made of glass and ceramics. Despite this trend, some still prefer relatively expensive and more fragile ceramic/glassware because plastics can deteriorate over time after exposure to foods, which can generate odors, bad appearance, and/or color change. Nano-ceramic coatings can eliminate these drawbacks while still retaining the advantages of the plastic, since the coating only alters the surface of the plastic. The surface coating adds functionality to the plastics such as self-cleaning and disinfectant capabilities that result from a photocatalytic effect of certain ceramic systems. These ceramic coatings can also provide non-stick surfaces and higher temperature capabilities for the base plastics without resorting to ceramic or glass materials. Titanium dioxide (TiO2) and zinc oxide (ZnO) are the candidates for a nano-ceramic coating to deposit on the plastics or plastic films used in cookware and kitchenware. Both are wide-bandgap semiconductors (3.0 to 3.2 eV for TiO2 and 3.2 to 3.3 eV for ZnO), so they exhibit a photocatalytic property under ultraviolet (UV) light. This will lead to decomposition of organic compounds. Decomposed products can be easily washed off by water, so the use of detergents will be minimal. High-crystalline film with large surface area for the reaction is essential to guarantee good photocatalytic performance of these oxides. Low-temperature processing (nano-ceramic coatings (TiO2, ZnO) on plastic materials (silicone, Teflon, PET, etc.) that can possess both photocatalytic oxide properties and flexible plastic properties. Processing cost is low and it does not require any expensive equipment investment. Processing can be scalable to current manufacturing infrastructure.

  3. Matching Performance among Visible and near Infrared Coating, Low Infrared Emitting Coating and Microwave Absorbing Coating

    Institute of Scientific and Technical Information of China (English)

    XIE Guohua; ZHANG Zuoguang; WU Ruibin

    2005-01-01

    The matching performance among the visible and near infrared conting, the low infrared emitting coating and the microwave absorbing coating was investigated. Experimental results shaw that the resulting material is characteristic of wideband effect ranging from the visible, near infrared and 3-5μm, 8- 14 μm infrared portion of the spectrum, as well as the radar region from 8 to 18 GHz when these three materials form a layerstructure material system. The microwave absorbing ability of material is hardly changed. The resonance peak moves towards lower frequency as the thickness of the visible, near infrared coating and the low infrared emitting coating increases. This problem can be resolved by controlling the thickness of the material. On the other hand,the infrared emissivity ε of the material system increases as the thickness of the visible, near infrared coating increases. This can be resolved by increasing infrared transparency of the visible and near infrared topcoating or controlling its thickness. The experimental resulting material system has spectral reflection characteristics in visible and near infrared regions that are similar to those of the natural bnckground.

  4. Protective Coatings for Aluminum Torpedoes

    Science.gov (United States)

    1983-06-01

    dhesion test, the entire coating sys- tea was removed, leaving the substrate exposed. During the impact tests, the 37 coating debonded within the...M tree ot detects in mawnai or dccrqva~e Weyesi aoicti cr Wi15 ryafsX-_ oa ifani w Aobgaon -rlefl CrS~ t1 hi~~~~~~~~ cadsoie.xrn a gab on srd... Eczema , rash Eye contact: Fodwith stemof water Inhalation Fresh Air Ingestion Call Physician for advice. DO NOT induce vomiting Skin contact Wash

  5. Coated carbon nanotube array electrodes

    Science.gov (United States)

    Ren, Zhifeng; Wen, Jian; Chen, Jinghua; Huang, Zhongping; Wang, Dezhi

    2008-10-28

    The present invention provides conductive carbon nanotube (CNT) electrode materials comprising aligned CNT substrates coated with an electrically conducting polymer, and the fabrication of electrodes for use in high performance electrical energy storage devices. In particular, the present invention provides conductive CNTs electrode material whose electrical properties render them especially suitable for use in high efficiency rechargeable batteries. The present invention also provides methods for obtaining surface modified conductive CNT electrode materials comprising an array of individual linear, aligned CNTs having a uniform surface coating of an electrically conductive polymer such as polypyrrole, and their use in electrical energy storage devices.

  6. Thin Films for Coating Nanomaterials

    Institute of Scientific and Technical Information of China (English)

    S.M.Mukhopadhyay; P.Joshi; R.V.Pulikollu

    2005-01-01

    For nano-structured solids (those with one or more dimensions in the 1-100 nm range), attempts of surface modification can pose significant and new challenges. In traditional materials, the surface coating could be several hundreds nanometers in thickness, or even microns and millimeters. In a nano-structured material, such as particle or nanofibers, the coating thickness has to be substantially smaller than the bulk dimensions (100 nm or less), yet be durable and effective. In this paper, some aspects of effective nanometer scale coatings have been discussed. These films have been deposited by a non-line of sight (plasma)techniques; and therefore, they are capable of modifying nanofibers, near net shape cellular foams, and other high porosity materials. Two types of coatings will be focused upon: (a) those that make the surface inert and (b) those designed to enhance surface reactivity and bonding. The former has been achieved by forming 1-2 nm layer of -CF2- (and/or CF3) groups on the surface, and the latter by creating a nanolayer of SiO2-type compound. Nucleation and growth studies of the plasma-generated film indicate that they start forming as 2-3 nm high islands that grow laterally, and eventually completely cover the surface with 2-3nm film. Contact angle measurements indicate that these nano-coatings are fully functional even before they have achieved complete coverage of 2-3 nm. They should therefore be applicable to nano-structural solids.This is corroborated by application of these films on vapor grown nanofibers of carbon, and on graphitic foams. Coated and uncoated materials are infiltrated with epoxy matrix to form composites and their microstructure, as well as mechanical behaviors are compared. The results show that the nano-oxide coating can significantly enhance bond formation between carbon and organic phases, thereby enhancing wettability,dispersion, and composite behavior. The fluorocarbon coating, as expected, reduces bond formation, and

  7. Corrosion-resistant coating development

    Energy Technology Data Exchange (ETDEWEB)

    Stinton, D.P.; Kupp, D.M.; Martin, R.L. [Oak Ridge National Lab., TN (United States)

    1997-12-01

    SiC-based heat exchangers have been identified as the prime candidate material for use as heat exchangers in advanced combined cycle power plants. Unfortunately, hot corrosion of the SiC-based materials created by alkali metal salts present in the combustion gases dictates the need for corrosion-resistant coatings. The well-documented corrosion resistance of CS-50 combined with its low (and tailorable) coefficient of thermal expansion and low modulus makes CS-50 an ideal candidate for this application. Coatings produced by gelcasting and traditional particulate processing have been evaluated.

  8. RECENT TECHNIQUES OF PHARMACEUTICAL SOLVENTLESS COATING: A REVIEW

    Directory of Open Access Journals (Sweden)

    Shital Dhuppe , S.S. Mitkare*, D.M. Sakarkar

    2012-07-01

    Full Text Available The coating of solid pharmaceutical dosage forms began in the 9th century B. C., with the Egyptians. Conventional coating techniques are based on solvents or water. Solventless coatings are alternative technique of coating. In solventless coating, the coating material is directly spread on the core and then it is cured by special method to form coat. Solventless coating avoids the use of water or it reduces to very small amounts with respect to the coating material hence it overcomes the limitations of conventional coating such as need for time, energy consuming, drying steps and the most important drug stability issues. A variety of solventless coating approaches are described in this review as powder coating, hot melt coating, supercritical fluid coating, magnetically assisted impaction coating, Plasma enhanced chemical vapor deposition. This review summarizes basic principle and process of the coating techniques.

  9. Novel alginate based coatings on Mg alloys

    Energy Technology Data Exchange (ETDEWEB)

    Sangeetha, K.; Roy, Abhijit [Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Singh, Satish [Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Lee, Boeun [Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Kumta, Prashant N., E-mail: pkumta@pitt.edu [Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261 (United States)

    2011-12-15

    Coatings on yttrium doped magnesium (Mg4Y) alloy substrates were prepared using alginate hydrogels by dip coating method to improve the surface bioactive properties of the substrate. Furthermore, composite coatings containing nano-sized calcium phosphate corresponding to hydroxyapatite (HA) phase entrapped within alginate hydrogel were also synthesized on the Mg4Y substrates. Surface characteristics of these coated substrates have been investigated using FTIR-ATR, SEM and EDS. The results show that the coatings with alginate alone are not stable in vitro; however, incorporation of NanoCaPs slightly improves the stability of these coatings. In addition, these composite coatings showed cell attachments with fibronectin incorporation. These results indicate that alginate hydrogels have the potential to be used as bioactive coating materials for different biofunctional applications.

  10. Improving thermal barrier coatings by laser remelting.

    Science.gov (United States)

    Múnez, C J; Gómez-García, J; Sevillano, F; Poza, P; Utrilla, M V

    2011-10-01

    Thermal barrier coatings are extensively used to protect metallic components in applications where the operating conditions include aggressive environment at high temperatures. These coatings are usually processed by thermal spraying techniques and the resulting microstructure includes thin and large splats, associated with the deposition of individual droplets, with porosity between splats. This porosity reduces the oxidation and corrosion resistance favouring the entrance of aggressive species during service. To overcome this limitation, the top coat could be modified by laser glazing reducing surface roughness and sealing open porosity. ZrO2(Y2O3) top coat and NiCrAlY bond coating were air plasma sprayed onto an Inconel 600 Ni base alloy. The top coat was laser remelted and a densified ceramic layer was induced in the top surface of the ceramic coating. This layer inhibited the ingress of aggressive species and delayed bond coat oxidation.

  11. Durable Dust Repellent Coating for Metals Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The Durable Dust Repellent Coating (DDRC) consists of nano-phase silica, titania, or other oxide coatings to repel dust in a vacuum environment over a wide range of...

  12. STUDY ON VISCOELASTIC BEHAVIOR OF PAPER COATING

    Institute of Scientific and Technical Information of China (English)

    Heng Zhang; Kefu Chen; Rendang Yang

    2004-01-01

    The flow behavior of paper coating is critical to the coating operation. In this work, the influence of the added agents on the flow behavior and the viscoelastic behavior is investigated using rheometer in steady and dynamic oscillatory modes.

  13. Development of coatings for fusion power applications

    Energy Technology Data Exchange (ETDEWEB)

    Smith, D.L. E-mail: dalesmith@anl.gov; Konys, J.; Muroga, T.; Evitkhin, V

    2002-12-01

    Coatings have been proposed as the solution to critical materials constraints for most of the blanket concepts under development for fusion power applications. However, the international programs on coating development are focused primarily on electrically insulating coatings to mitigate the magneto-hydrodynamic pressure drop in self-cooled lithium/vanadium blanket concepts, and on tritium permeation barriers to reduce tritium permeation from Pb-Li into the water coolant in water-cooled Pb-Li concepts. Emphasis of the insulator coating development is on CaO and AlN coatings formed on vanadium alloys either in situ in lithium or by vapor deposition processes. The tritium barrier coating development is focused on Al{sub 2}O{sub 3} formed on aluminized martensitic steels by several processes. This paper presents an overview of the fundamental materials issues associated with the various coatings and the status of coating development for the various applications.

  14. Genetics Home Reference: Coats plus syndrome

    Science.gov (United States)

    ... Coats disease plus abnormalities of the brain, bones, gastrointestinal system, and other parts of the body. Coats disease ... life-threatening complications including abnormal bleeding in the gastrointestinal tract, high blood pressure in the vein that supplies ...

  15. Stress and structure development in polymeric coatings

    Science.gov (United States)

    Vaessen, Diane Melissa

    2002-09-01

    The main goal of this research is to measure the stress evolution in various polymer coating systems to establish the mechanisms responsible for stress development, stress relaxation, and defect formation. Investigated systems include ultraviolet (UV)-curable coatings, dense and porous coatings from polymer solutions, and latex coatings. Coating stress was measured using a controlled environment stress apparatus based on a cantilever deflection principle. For acrylate coatings, it was found that by cycling a UV-lamp on and off, keeping the total dose constant, coating stress was lowered by 60% by decreasing the cycle period. A stress minimum was also found to exist for a given dose of radiation. The lower stress is attributed to stress relaxation and/or slower reaction during dark periods. A viscoelastic stress model of this process was formulated and predicted stress values close to those observed experimentally. During drying of cellulose acetate (CA) coatings cast in acetone, final stress increased from 10 to 45 MPa as coating thickness decreased from 60 to 10 mum. This thickness dependent coating stress for a solvent-cast polymer coating is a new finding and is attributed to (1) less shrinkage in thicker coatings due to more trapped solvent (from skinning) and (2) greater amounts of polymer stress relaxation in thicker coatings. For porous CA coatings prepared by dry-cast phase separation, final in-plane stresses ranged from 20 MPa for coatings containing small pores (˜1 mum) to 5 MPa for coatings containing small pores and macrovoids (˜200 mum). For these coatings, a small amount of stress relaxation occurs due to capillary pressure relief. A stress plateau for the macrovoid-containing coating is likely caused by stress-induced rupture of the polymer-rich phase. Measured stress in pigment-free latex coatings was much lower (˜0.3 MPa) than UV-curable and solvent-cast polymer coatings and was found to increase with increasing latex glass transition

  16. Microneedle Coating Techniques for Transdermal Drug Delivery

    OpenAIRE

    Rita Haj-Ahmad; Hashim Khan; Muhammad Sohail Arshad; Manoochehr Rasekh; Amjad Hussain; Susannah Walsh; Xiang Li; Ming-Wei Chang; Zeeshan Ahmad

    2015-01-01

    Drug administration via the transdermal route is an evolving field that provides an alternative to oral and parenteral routes of therapy. Several microneedle (MN) based approaches have been developed. Among these, coated MNs (typically where drug is deposited on MN tips) are a minimally invasive method to deliver drugs and vaccines through the skin. In this review, we describe several processes to coat MNs. These include dip coating, gas jet drying, spray coating, electrohydrodynamic atomisat...

  17. Cirrus Dopant Nano-Composite Coatings

    Science.gov (United States)

    2014-11-01

    Inorganic Nano-particles • Ti • Zr • Al • Zn • Yr • Si Coatings • Au • Ag • Sn • Cu • Zn • Ni • NiB • NiCo • NiP cirrus Broadened...1000 1200 HARDNESS (HV) MICROHARDNESS - ELECTROLESS NIP STANDARD COATING TI DOPED COATING ZR DOPED COATING ↑74% Standard DC NiB Cirrus DC NiB 15

  18. Deposition and Coating Properties on CVD Tungsten

    Institute of Scientific and Technical Information of China (English)

    DU Ji-hong; LI Zheng-xiang; LIU Gao-jian; ZHOU Hui-Huang; CHUN liang

    2004-01-01

    Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.

  19. RECENT TECHNIQUES OF PHARMACEUTICAL SOLVENTLESS COATING: A REVIEW

    OpenAIRE

    Shital Dhuppe , S.S. Mitkare*, D.M. Sakarkar

    2012-01-01

    The coating of solid pharmaceutical dosage forms began in the 9th century B. C., with the Egyptians. Conventional coating techniques are based on solvents or water. Solventless coatings are alternative technique of coating. In solventless coating, the coating material is directly spread on the core and then it is cured by special method to form coat. Solventless coating avoids the use of water or it reduces to very small amounts with respect t...

  20. 抗氯盐高性能混凝土中阻锈剂长期阻锈效果研究%Research on the long-term anticorrosion effectiveness of the corrosion inhibitors in anti-chlorine high performance concrete

    Institute of Scientific and Technical Information of China (English)

    杨医博; 王恒昌; 杨磊; 郭文瑛; 陈峭卉; 梁松

    2014-01-01

    采用14种阻锈剂,用半电池电位法和劈裂观察法研究了抗氯盐高性能混凝土中阻锈剂的长期阻锈效果,研究确定适宜的阻锈剂长期阻锈效果评价方法;并通过与盐水浸渍试验和钢筋锈蚀快速试验(硬化砂浆法)结果对比,探讨快速阻锈性能试验方法的可靠性。结果表明:半电池电位法和劈裂观察法两种方法均有较好的判别阻锈剂长期阻锈效果的能力,可以共同使用判断阻锈剂的阻锈效果;快速阻锈试验结果与长期试验结果存在较大差异,快速试验结果仅能用作阻锈剂初步选择,不能用作阻锈剂在抗氯盐高性能混凝土中具有长期阻锈效果的判据。%Researches the long-term anticorrosion effectiveness of the 14 kinds of corrosion inhibitors in anti-chlorine high performance concrete through the half cell potential method and Splitting observation test,finds the appropriate long-term evaluation method,and ex-plores the reliability of the rapid evaluation method through comparing the results which from the saline solution soak method and harden mortar method. It is indicated that:(1)Both the half cell potential method and splitting observation test have ability to evaluate the long-term anticorrosion effectiveness;(2)There is a big difference between the result of the long-term test and rapid evaluation method;(3)The result of the rapid evaluation test is only used for the primarily select ,and which can't be used as the criteria for the long-term anti-corrosion effectiveness of the corrosion inhibitors.