Composition and process for treating metal surfaces

Details Composition and process for treating metal surfaces Composition and process for treating metal surfaces

1989-02-07

1990-10-16

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2260

Patent

active

049631985

ABSTRACT:
An alkaline aqueous solution comprising hexavalent chromium, trivalent chromium, and a complexing agent for trivalent chromium sufficiently effective to solubilize at least 20 ppm of trivalent chromium forms a protective coating when contacted with zinc, aluminum, and particularly zinc-aluminum alloys.

REFERENCES:
patent: 2911332 (1959-11-01), Schuster
patent: 3935035 (1976-01-01), Tanaka
patent: 4801337 (1989-01-01), Higgins

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