Electrochemical behavior of metallic chromium in chloride media

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Data

2000-01-01

Autores

Silva, G. C.
Vilchenski, M. C.
Sumodjo, PTA
Benedetti, Assis Vicente [UNESP]

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Electrochemical Society Inc

Resumo

The electrochemical behavior of metallic chromium in aqueous solutions containing chloride ions at different pH was studied by means of open-circuit potential vs. time measurements, cyclic voltammetry and electrochemical impedance spectroscopy. The composition of the surface oxides was analyzed by XPS. For solutions with pH<3 the formation of a passive layer occurs via a dissolution/precipitation process while for pH>3 the mechanism changes. XPS analysis revealed that Cr2O3 basically constitutes the passive layer.

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Corrosion and Corrosion Control In Saltwater Environments. Pennington: Electrochemical Society Inc., v. 99, n. 26, p. 183-+, 2000.