Patent ID: 6410092
Filing Date: 2002-06-25
Classification: B05D

Abstract:
A method of improving the corrosion resistance of a metallic surface, said method comprisinga) contacting said metallic surface with an autodeposition bath comprising a resin in uncured emulsion or dispersion form and an autodeposition activator until a layer of the resin of desired thickness is autodeposited on said metallic surface; b) rinsing said metallic surface having the layer of resin autodeposited thereon with a chromium-free aqueous solution comprising an anticorrosive effective amount of at least one water-soluble alkaline earth metal compound selected from the group consisting of calcium nitrate, calcium chloride, calcium acetate, calcium formate, barium nitrate, barium acetate, and magnesium benzoate; and c) curing the layer of resin autodeposited on said metallic surface, wherein said layer of resin autodeposited on said metallic surface is not contacted with any chromium compound and is not rinsed with water alone after the rinsing step b) and before said curing.