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Selection of alternatives to hexavalent chromium for inhibitors and inhibiting films for Al and its alloys requires a clear understanding of how hexavalent chromium inhibits corrosion. To this end, the following hypotheses have been proposed: residual chromate in conversion coatings provides self healing; hydrated Cr(III) oxide films are uniquely inert and hydrophobic; oxyanions of Cr(VI) rapidly...
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