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US 5,328,525 AGranted
Method and composition for treatment of metals
AssigneeBetz Laboratories, Inc.
InventorsEdward M. Musingo, Bruce V. Haberle, Philip D. Deck
Life of this patent
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Abstract
A non-chromate pretreatment for aluminum and zinc-aluminum galvanized steel is disclosed which comprises a polyacrylic acid or homopolymers and copolymers thereof, a molybdate, and a dihydrohexafluo acid.
Claims6
An aqueous acidic solution which is effective in forming a dried in place non chromate conversion coating on a surface of Galvalume aluminum or alloys thereof consisting essentially of:
- (a) From about 10 to 60% by weight of a polymer selected from the group consisting of polyacrylic acid and copolymers and homopolymers thereof;
- (b) From about 0.2 to 20 weight percent molybdate and
- (c) From about 10 to 60% by weight dihydro-hexafluo acid.
A method of forming a conversion coating on a surface of Galvalume aluminum or alloys thereof comprising reacting the surface with an aqueous, acidic solution consisting essentially of:
- (a) From about 10 to 60% by weight of a polymer selected from the group consisting of polyacrylic acid and homopolymers and copolymers thereof;
- (b) From about 0.2 to 20% by weight molybdate and
- (c) From about 10 to 60% by weight dihydro-hexafluo acid.
Dependencies are inferred from the claim text.