Patent ID: 7166364
Filing Date: 2007-01-23
Classification: C23C,Y10T

Abstract:
1. A metal article wherein the metal is selected from the group consisting of an aluminum, aluminum alloy, iron, iron alloy, zinc, zinc alloy, zinc coated iron, zinc coated iron alloy, and the these metals and magnesium and magnesium alloys having a conversion coating; comprising said metal having thereon an in-situ polyester conversion coating formed from an aqueous coating composition consisting essentially of 60 to 90 parts by weight water, 0.5 to 10 parts by weight of a polyvinyl alcohol having a weight average molecular weight of at least 100,000 and being at least 95% hydrolyzed, 0.5 to 20 parts by weight of a polybasic acid or anhydride, and 0.0 to 3 parts by weight of a cross-linking agent or plasticizer to form the in-situ polyester conversion coating on the metal.