Abstract
The electrodissolution and passivation of pure chromium in acidic chloride solutions was studied using potentiodynamic techniques and rotating disc electrodes. The anodic dissolution is pH dependent with a negative fractional reaction order with respect to [H +]. No dependence on the Cl − concentration was found in pH 1 solutions. A model is proposed where the anodic dissolution proceeds via the formation of adsorbed Cr(OH) 2 as the rate determining step, followed by chemical dissolution to Cr 2+ (aq). The passivation reaction is the oxidation of divalent adsorbed hydroxide to trivalent oxide-hydroxide. Chloride ions may react with the divalent hydroxide in a competitive substitution reaction, extending the potential region for anodic dissolution. The oxidation of Cl −-containing divalent intermediates, renders the ligands inert and yields a chloride containing passive film.
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