The electrode kinetic behavior of nickel was studied by potentiokinetic, potentiostatic, and potential decay techniques in sulfate solutions of p H 1.3, 3.4, and 6.3 adjusted to constant 0.1 N ionic strength by additions. The active‐passive transition characteristic of the room temperature behavior of nickel was found to be absent at temperatures above 100°C. However, at temperatures above 250°C, indications of oxide formation were found although there was little contribution to passivity therefrom. In addition, the temperature stability of passive films and these oxides seems to be p H dependent. Theoretical potential‐pH diagrams were also constructed for the nickel‐water systems for the temperature range used in these experiments.
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Cowan et al. (1971) studied this question.