Abstract

AbstractVarious characteristic pitting potentials are defined which may be observed in a system simultaneously. Following these definitions, galvanostatic polarization techniques are expected to result in potential oszillations whenever the pit nucleation potential, Unp, differs from the critical potential for pit repassivation, Ucp, of a system.With nickel polarized in neutral, chloride containing sulphate solution the electrode potential oscillates periodically. The lower limit responds to the critical potential, Ucp, determined by potentiostatic measurements.

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