Corrosion Protection of Electrogalvanized Steel Sheet by Chromate-free Coating with Tetravalent Vanadium Ions
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The corrosion-protective behavior of electrogalvanized steel sheets (EG) by tetravalent vanadium ions was investigated. The immersion of bare EG in a NaCl solution revealed that the cathodic reactivity to form vanadium (III) oxide on the EG surface decreased when vanadium (IV) oxide sulfate was added to the solution. Characterization of the corrosion products by X-ray photoelectron spectroscopy revealed that vanadium (III) precipitated as V2O3 on the EG surface, while ZnO was also included in the corrosion products. It was assumed that vanadium (IV) species was reduced to vanadium (III) simultaneously with the oxidation of zinc, and V2O3 precipitates immediately on the EG surface. The corrosion-protective ability of an epoxy coating containing vanadium (IV) species was investigated by a salt spray test. The white rust area of EG coated with vanadium (IV) species was smaller than that without vanadium (IV). Since the reduction reaction of vanadium (IV) species followed by the precipitation of V2O3, which has a high corrosion protection ability, indicated a corrosion-protective process similar to that of chromium (VI) ions, vanadium (IV) species was concluded as a candidate inhibitor for chromate-free coatings.
Abstract
The corrosion-protective behavior of electrogalvanized steel sheets (EG) by tetravalent vanadium ions was investigated. The immersion of bare EG in a NaCl solution revealed that the cathodic reactivity to form vanadium (III) oxide on the EG surface decreased when vanadium (IV) oxide sulfate was added to the solution. Characterization of the corrosion products by X-ray photoelectron spectroscopy revealed that vanadium (III) precipitated as V2O3 on the EG surface, while ZnO was also included in the corrosion products. It was assumed that vanadium (IV) species was reduced to vanadium (III) simultaneously with the oxidation of zinc, and V2O3 precipitates immediately on the EG surface. The corrosion-protective ability of an epoxy coating containing vanadium (IV) species was investigated by a salt spray test. The white rust area of EG coated with vanadium (IV) species was smaller than that without vanadium (IV). Since the reduction reaction of vanadium (IV) species followed by the precipitation of V2O3, which has a high corrosion protection ability, indicated a corrosion-protective process similar to that of chromium (VI) ions, vanadium (IV) species was concluded as a candidate inhibitor for chromate-free coatings.
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