The Scanning Reference Electrode Technique (SRET) has been used to study the influence of a range of anodic and Cathodic corrosion inhibitors on patterns of localized corrosion occurring on the intact zinc surface of galvanized sheet steel. The SRET can spatially resolve localized anodic and cathodic activity occurring across the zinc surface and has highlighted some promising novel inhibitor species namely rare earth metal salts containing cerium (III), lanthanum (III) and yttrium (III) cations. Conversely anodic inhibitor systems containing tungstate (WO42−) and molybdate (MoO42−) anions have been shown to induce severe pitting corrosion accelerating perforation of the zinc coating and exposing the steel substrate.

Subject
Electric current, Steel surfaces, Sodium chloride, Anode surfaces, Galvanized steel, Anodic current, Corrosion inhibitors, Immersion, Zinc, Cations, Cathodic inhibitors, Anodes, Anodic inhibitors
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1999
Association for Materials Protection and Performance (AMPP)
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