Sample records for COMPLEJOS DE ESTA?O (tin complexes)
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Sample records 1 - 10 shown.



1

EFECTO DEL ION CITRATO EN EL COMPORTAMIENTO ELECTROQUÍMICO DEL ESTAÑO Y EL ACERO/ EFFECT OF THE CITRATE ION ON THE ELECTROCHEMICAL BEHAVIOR OF TIN AND STEEL/ EFEITO DO ÍON CITRATO NO COMPORTAMENTO ELETROQUÍMICO DO ESTANHO E DO AÇO

Calderón, Jorge A.; Paula M., Montoya
2007-12-01

Resumen en portugués O presente trabalho tem como objetivo contribuir com o conhecimento do comportamento eletroquímico da folha de flandes em meios contendo íons citrato, bem como o papel que a concentração de íon citrato desempenha na estabilidade dos recipientes. Os estudos eletroquímicos foram conduzidos a partir dos materiais individuais que constituem o ferro estanhado, ou seja, o aço e o estanho. Os experimentos foram realizados utilizando- se técnicas de polarização potencio (mas) dinâmica e de impedância eletroquímica em eletrodos formados, separadamente, por aço e estanho que permaneceram imersos em soluções de citrato, a pH 3,0 com diferentes concentrações. Foi evidenciado que o íon citrato apresenta um efeito notável de depolarização anódica no estanho pela formação de complexos estáveis e solúveis. Consequentemente, o estanho se torna anódico em relação ao aço e oferece uma proteção anticorrosiva aos substratos de aço que constituem os recipientes de ferro estanhado. Resumen en español El presente trabajo pretende hacer un aporte al conocimiento del comportamiento electroquímico de recipientes de hojalata en medio del ion citrato, y al papel que juega la concentración de dicho ion en la estabilidad de los recipientes. Todo ello, a través del estudio electroquímico individual de los materiales con los cuales son fabricados los recipientes de hojalata, acero y estaño. El estudio se llevó acabo mediante medidas de polarización potenciodinámica e im (mas) pedancia electroquímica sobre electrodos fabricados con ambos materiales e inmersos en soluciones de diferentes concentraciones de citrato a un valor de pH de 3,0. Se evidencia que a este valor de pH, el ion citrato ejerce un notable efecto de despolarización anódica sobre el estaño, por la formación de complejos solubles y estables. Esto hace que el estaño se torne anódico respecto al acero pudiendo otorgar una protección anticorrosiva al sustrato de acero de los recipientes de hojalata. Resumen en inglés The present work tries to do a contribution to the knowledge of the electrochemical behavior of tinplate containers in citrate ion medium and the role that citrate ion concentration plays on the stability of the containers; all that, through the individual electrochemical study of the materials of which the tinplate is made, steel and tin. The study was done by potentiodynamic polarization and electrochemical impedance on electrodes made with both materials, immersed in s (mas) olutions of different citrate concentrations at pH 3,0. It was evidenced that the citrate ion has a remarkable effect of anodic depolarization on tin with the formation of soluble and stable complexes. This causes that tin becomes anodic with respect to the steel being able to grant an anticorrosive protection to the steel substrate of the tinplate containers.

Scientific Electronic Library Online (Spanish)

2

Survey of organotin compounds in rivers and coastal environments in Portugal 1999-2000

Díez Salvador, Sergi; Lacorte Bruguera, Silvia; Viana, Paula; Barceló, Damià; Bayona Termens, Josep María
2005-03-23

Digital.CSIC (Spain)

3

Robust dynamical pattern formation from a multifunctional minimal genetic circuit

Rodrigo, Guillermo; Carrera, Javier; Elena, Santiago F.; Jaramillo, Alfonso
2010-04-22

Digital.CSIC (Spain)

4

Regímenes estático y dinámico en la evolución estructural de microclinas pertíticas

Sánchez-Muñoz, L.; García Guinea, Javier; Correcher, Virgilio; Sanz Lázaro, Jesús
2006-07-01

Digital.CSIC (Spain)

6

Naturaleza y formación de los complejos intermedios del sistema SnCl2 - NH4OH - H2O

Ortiz, A.; Mendoza, M.; Rodríguez Paez, J.E.
2001-10-01

Resumen en inglés Current technological advances require that the raw materials used in the production of electric devices and structural materials present special characteristics of chemical purity, size distribution and morphology of the particles. Tin oxides are mainly used as gas sensor and as surges suppressor (varistor). To achieve an appropriate control on the mentioned characteristics, we use the method of controlled precipitation (MPC), which allowed us to obtain certain character (mas) istics in other oxides. When using the MPC, it is necessary to determine the complexes that are formed and their nature. In this work we present results of study on the formation of complexes in the system SnCl2 - NH4OH - H2O. To study the system during the constant addition of the base (NH4OH) to the solution of tin salt, we used potentiometric and conductimetric titration. For the determination of the nature of the formed tin complexes, the solid phase was characterized using X-ray diffraction (XRD) while the liquid phase was analyzed by UV-visible and infrared spectroscopies.

Scientific Electronic Library Online (Spanish)

7

Microstructural and chemical characterisation techniques for nanostructured and amorphous coatings

Godinho, V.; Fernández-Ramos, C.; Martínez-Martínez, D.; García-López, F. J.; Sánchez López, Juan Carlos; Fernández Camacho, Asunción
2008-06-19

Digital.CSIC (Spain)

8

Electrocatalytic oxidation of nitrite to nitrate mediated by Fe(III) poly-3-aminophenyl porphyrin grown on five different electrode surfaces

Armijo, Francisco; Goya, M. Carmen; Reina, Matías; Canales, M. Josefina; Arévalo, Maria Carmen; Aguirre, M. Jesús
2007-05-01

Digital.CSIC (Spain)

10

Anticipated synchronization in neuronal system subject to noise

Toral, Raúl; Mirasso, Claudio R.; Masoller, Cristina; Ciszak, Marzena; Calvo, Óscar
2003-07-25

Digital.CSIC (Spain)