Abstract
Abstract The passivation of cadmium and cadmium amalgam in alkaline solutions has been studied by the galvanostatic transient technique. The dependence of i τ 1 2 on i at low current densities and constancy at high current densities observed fits well with the theoretical relationship derived by Reddy, Devanathan and Bockris. The results are analysed with reference to the dissolution-precipitation mechanism in which the passivating step is the formation of an electronically conducting monolayer of oxide. A mechanism for the passivation of cadmium is proposed, the active intermediate being CdOH + ion. The results of Kaesche have been interpreted to show that a similar mechanism holds good for the passivation of zinc, the probable intermediate species being ZnOH + ion. The recent criticisms by Fleischmann et al. of the dissolution-precipitation model based on potentiostatic experiments are shown to be unfounded.
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