Phosphating process for zinc-plated metals
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United States of America Patent
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Feb 5, 1985
Grant Date -
N/A
app pub date -
Nov 25, 1983
filing date -
Dec 8, 1982
priority date (Note) -
Expired
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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.
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