Process and composition for conversion coating metal surfaces

Details Process and composition for conversion coating metal surfaces Process and composition for conversion coating metal surfaces

1987-04-02

1989-01-31

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 2260

Patent

active

048013374

ABSTRACT:
An improved composition and process for forming a corrosion-resistant complex oxide coating on a zinc or zinc alloy surface incorporates in an aqueous alkaline composition of pH value greater than 11 at least three complexed polyvalent metals, one of which is trivalent chromium.

REFERENCES:
patent: 3404046 (1968-10-01), Russell
patent: 3444007 (1969-05-01), Maurer

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