Chromate coating of zinc surfaces

Details Chromate coating of zinc surfaces Chromate coating of zinc surfaces

1986-08-08

1988-06-07

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 2233

Patent

active

047494182

ABSTRACT:
A chromate composition and process provide improved corrosion resistance and paint adhesion for zinc surfaces. The aqueous acidic composition contains hexavalent and trivalent chromium phosphate and fluorozirconate at prescribed concentrations. The composition is applied and dried without rinsing to yield a chromium coating weight of 10-200 mg/m.sup.2.

REFERENCES:
patent: 3076734 (1963-02-01), Schemkur
patent: 3382111 (1968-05-01), Tongyai
patent: 3562011 (1971-02-01), Hirst

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