Electrochemical studies with copper-based alloys: open-circuit potential oscillations in alkaline media

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1993-06-01

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Electrochemical Soc Inc.

Resumo

In open-circuit potential measurements of certain Cu-based alloys in NaOH solutions oscillations were observed in Cu-Al and Cu-Ag-Al. Studies with various electrolyte concentrations and rotation speeds of the electrode led to a possible explanation of the phenomenon in terms of Al dissolution altering the main Cu dissolution/passivation process. The accumulation of aluminate ions on the interphase and its transportation to the bulk solution are the main causes of the oscillations.

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Journal of the Electrochemical Society. Pennington: Electrochemical Society Inc., v. 140, n. 6, p. 1567-1571, 1993.