Phosphating process for zinc-plated metals

Details Phosphating process for zinc-plated metals Phosphating process for zinc-plated metals

1983-11-25

1985-02-05

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23F 708

Patent

active

044976682

ABSTRACT:
A process for phosphating zinc-plated metal articles, particularly electrolytically zinc-plated steel sheets, by treatment thereof for a short period with an acidic phosphating solution which, in addition to zinc and phosphate ions, can contain other metal cations and/or anions of oxygen-containing acids having an accelerating effect, wherein the phosphating solution has a content of Zn.sup.2+ -cations of between about 1 and 2.5 g/l, a free acid content in the range from 0.8 to 3 points, and the acid ratio of total acid to free acid in the range from 5 to 10. The phosphating treatment is carried out for a period of time not in excess of about 5 seconds.

REFERENCES:
patent: 3625777 (1971-12-01), Okabe et al.
patent: 3810792 (1974-05-01), Ries et al.
patent: 4389260 (1983-06-01), Hauffe

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