Acidic zinc phosphate solution and method

Details Acidic zinc phosphate solution and method Acidic zinc phosphate solution and method

1977-09-30

1979-05-08

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

C23F 708

Patent

active

041534794

ABSTRACT:
An aqueous acidic oxidant-free zinc phosphate solution contains tartaric acid, citric acid and/or a salt of either. At a pH of about 3.5 to 4.7, the solution produces a microcrystalline coating of zinc phosphate on iron or steel. The solution preferably contains nickel ion also.

REFERENCES:
patent: 2516139 (1950-07-01), Mazia
patent: 3307979 (1967-03-01), Upham

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