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

1990-03-08

1992-07-14

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2234

Patent

active

051299674

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 dihydrohexafluozirconic acid, more than 10 grams per liter polyacrylic acid and more than 0.17 grams per liter hydrofluoric acid in a ratio of 1:0.84:0.014. 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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