Composition and method for non-chromate coating of aluminum

Details Composition and method for non-chromate coating of aluminum Composition and method for non-chromate coating of aluminum

C - Chemistry, Metallurgy

23

C

148/23

C23C 22/34 (2006.01) C23C 22/56 (2006.01)

Patent

CA 2025218

ABSTRACT OF THE DISCLOSURE A chromate and phosphate free composition and method for forming a dried in place conversion coating for aluminum and alumi- num alloys. The method entails the application of the composition to aluminum or aluminum alloys and allowing the composition to dry in place. The composition is an acidic aqueous solution preferably containing more than 8 grams per liter dihydrohexafluozirconic acid, more than 10 grams per liter polyacrylic acid and more than 0.17 grams per liter hydrofluoric acid in a ratio of 1 : .84 : .014. Up to about 0.6 gram per liter dihydrohexafluotitanic acid is added to facilitate analytical testing in aqueous systems. The solution forms a dried in place conversion coating having a weight of from 6 to 25 milligrams per square foot in treatment (contact and drying) times as short as 2 seconds.

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