Back to results
US 8,282,801 B2Granted
Methods for passivating a metal substrate and related coated metal substrates
AssigneePPG Industries Ohio, Inc.
InventorsEdward F. Rakiewicz, Mark W. McMillen, Richard F. Karabin, Michelle Miles
Life of this patent
Estimating the term…
Abstract
Disclosed are methods for passivating metal substrates, including ferrous substrates, such as cold rolled steel and electrogalvanized steel. The methods comprise the steps of depositing an electropositive metal onto at least a portion of the substrate, followed immediately by electrophoretically depositing on the substrate a curable, electrodepositable coating composition. The present invention also relates to coated substrates produced by the above methods.
Claims16
A method for passivating a metal substrate surface comprising:
- (a) depositing an electropositive metal onto at least a portion of the substrate, wherein the electropositive metal is deposited by contacting the substrate with a plating solution of a soluble metal salt that is essentially free of chromates and trication metal phosphates, wherein the electropositive metal is included in the plating solution in an amount from 1 to 50 ppm of total metal, measured as elemental metal;
- followed immediately by
- (b) electrophoretically depositing on the substrate a curable, electrodepositable coating composition.
Dependencies are inferred from the claim text.