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

1988-05-03

1990-05-01

Silverberg, Sam

Bridges

Truss

Arrangement

148251, C23C 2234

Patent

active

049215523

ABSTRACT:
A chromate and phosphate free composition and method for forming a dried in place conversion coating for aluminum and aluminum 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 dihydro-hexafluozirconaic acid, more than 10 grams per liter polyacrylic acid and more than 0.17 grams per liter hydrofluoric acid in a ratio of 1:0.84:0.014. 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.

REFERENCES:
patent: 3912548 (1975-10-01), Faigen
patent: 4191596 (1980-03-01), Dollman et al.
patent: 4313769 (1982-02-01), Frelin et al.
patent: 4370173 (1983-01-01), Dollman
patent: 4370177 (1983-01-01), Frelin et al.
patent: 4422886 (1983-12-01), Das et al.
patent: 4545842 (1985-10-01), Parsons

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