Phosphating process for zinc-plated metals

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

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/12 (2006.01) C23C 22/13 (2006.01)

Patent

CA 1205727

ABSTRACT OF THE DISCLOSURE 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 Zn2+-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.

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