A Review of Proposed Mechanisms for Corrosion Inhibition and Passivation by Metallic Cations

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Abstract
Metallic cations are effective corrosion inhibitors under certain experimental conditions. They may also be virulent activators of corrosion in acids in the case of cations which in the metallic form may have high exchange densities for hydrogen evolution. Eleven mechanisms whereby metallic cations inhibit corrosion are briefly described and examples from the literature are cited. The means by which metallic cations inhibit corrosion include: 1) participation in the cathodic reaction, 2) substitution of another reaction for the anodic corrosion reaction, 3) reduction of a corrosion promoting species, 4) control of the pH of a medium, 5) catalysis of polymer formation, and six mechanisms which involve inclusion of the cation, or the reduced metal atom, in a coating on the surface of the corroding metal, 6) effect on the cathodic reaction, 7) change in morphology of corrosion product or corroding metal, 8) change in protective nature of oxide on the surface, 9) formation of an insoluble barrier lay...

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