DRY-IN-PLACE CORROSION-RESISTANT COATING FOR ZINC OR ZINC-ALLOY COATED SUBSTRATES

摘要

A process for making a corrosion-resistant metal component. The process having the steps of: combining water, at least one zinc phosphate compound and at least one chromium compound, being chromium (III) or chromium (IV) compounds, to form a first solution; separately combining at least one silicate compound with water to form a second solution; combining the first solution with the second solution such as to form a mixed aqueous solution; optionally combining the mixed aqueous solution with at least one acrylic resin to form a coating mixture; and, applying the coating mixture to a metal substrate having a zinc or zinc-alloy surface to form a coating on the metal substrate, the coating providing chemical resistance for at least 150 hours in accordance with ASTM B117 standards where the zinc or zinc-alloy coating of the metal substrate has a weight of 0.04 oz/ft2 (12.20g/m2).