INVESTIGADORES
VAZQUEZ marcela Vivian
artículos
Título:
Caracterización de Películas Superficiales Sobre Aleaciones de Cobre: Influencia Sobre la Reducción de Oxígeno.
Autor/es:
FERNANDO BRIZUELA; SILVIA CERÉ; MARCELA VAZQUEZ
Revista:
REVISTA MATéRIA
Editorial:
UNIV FED RIO DE JANEIRO
Referencias:
Año: 2003 vol. 8 p. 256 - 262
ISSN:
1517-7076
Resumen:
Corrosion phenomena are of permanent interest and of technological importance due to the direct and indirect economiclosses it conveys. Studying the processes that participate in the corrosion of a material contributes in keeping it undercontrol. Oxygen reduction is the dominant cathodic reaction in aerated aqueous media. The mechanism of this reaction isinteresting to study because of the importance of this reaction in the technology of fuel cells and in the protection ofmaterials. Information on the mechanism of this reaction on corrodible metals is scarce. In this work, oxygen reduction oncopper and copper-nickel alloys UNS 72000 and UNS 70600 in aerated borax-borate buffer solution of pH 7.7 isinvestigated. The goal is to advance in the investigation of the relationship between alloy composition and the kinetics ofthe reduction reaction on pre-reduced and oxidized materials under potentiostatic control. The compositions of the passivefilms formed in situ on the different materials in controlled conditions are studied using differential reflectancespectroscopy. Other in situ techniques that include voltammetry and electrochemical hydrodynamic techniques such asrotating disc are used to characterize the kinetic parameters of the oxygen reduction reaction.