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US 6,475,645 B1Granted
Surface treatment of steel
AssigneeFord Global Technologies, LLC
InventorsPaul Alexander Osman, Haibo Yan, Jian Yu, Laurence Charles Archibald, Samuel James Harris
Life of this patent
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Abstract
A painted steel article having a steel surface, being plated with a corrosion-resistant coating. The corrosion-resistant coating contains at least 90% zinc, cobalt, at least one trivalent or higher-valent metal, and at least one colloidal inorganic material. The paint is then electrodeposited directly on the corrosion-resistant coating.
Claims18
A steel article comprising:
- a steel surface, at least a portion, having a corrosion-resistant coating of at least 90% zinc, cobalt, at least one trivalent or higher valent metal, and at least one colloidal inorganic material;
- and
- an electrodeposited paint layer directly on said corrosion-resistant coating.
A method of producing a painted steel article, comprising the steps of:
- plating at least a portion of a steel surface with a corrosion-resistant coating of at least 90% zinc, cobalt, at least one trivalent or higher-valent metal and at least one colloidal inorganic material;
- and
- electrodepositing a paint layer directly on said coating.
The method of 14, wherein the higher-valent metal is chromium or molybdenum.
Dependencies are inferred from the claim text.