Abstract
The passivity breakdown of high purity zinc was studied in borate buffered sodium chloride solutions. Based on previous ion-migration calculations ( Corros. Sci. 24, 517, 1984) synthetic pit-like solutions were prepared, and the behaviour of zinc in those solutions was studied. The experimental observations allowed for a quantitative evaluation of the equation for pitting potentials: E p = E ∗ c + η + Δφ. This equation, derived from the localized acidification mechanism for pitting, was found to give a complete account of the experimental observations of passivity breakdown of zinc. The OH- ion depletion, at the metal-solution interface, proved to be the cause of passivity breakdown of high purity zinc in borate buffered sodium chloride solutions.
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