Method for preparing and treating a steel substrate
AssigneePPG Industries Ohio, Inc.
InventorsBrian C. Okerberg, Richard M. Vargas, Randall J. Brent, John F. McIntyre, Mark W. McMillen, Nathan J. Silvernail
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Abstract
Disclosed are methods for treating metal substrates, including ferrous substrates, such as cold rolled steel and electrogalvanized steel. The methods include contacting the metal substrates with a conditioning composition including a free fluoride source and then depositing a pretreatment composition including a Group IIIB and/or IVB metal on a portion of the substrate contacted with the conditioning composition. Also disclosed are electrophoretically coated substrates treated by the methods.
Claims24
A method for preparing and pretreating a substrate comprising:
- (a) contacting at least a portion of the substrate with a conditioning composition comprising a free fluoride source;
- and
- (b) depositing a pretreatment composition comprising a Group IIIB and/or Group IVB metal on at least a portion of the substrate contacted with the conditioning composition.
A coated substrate comprising:
- a first layer comprising a conditioning composition comprising a free fluoride source;
- a second layer comprising a pretreatment composition comprising a Group IIIB and/or Group IV metal deposited over at least a portion of the first layer;
- and
- a deposited coating composition deposited over at least a portion of the second layer.
Dependencies are inferred from the claim text.