Process for phosphating metal surfaces
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United States of America Patent
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Jul 31, 1990
Grant Date -
N/A
app pub date -
Jan 13, 1989
filing date -
Jan 14, 1988
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for phosphating metal surfaces, and more specifically of surfaces of iron, zinc, and aluminum and the alloys thereof as a pretreatment for cold working wherein the surfaces without previous activation are contacted in a temperature range of from 30.degree. C. to 70.degree. C. with an aqueous solution containing (a) from 10 to 40 g/l of Ca.sup.2+ ions, (b) from 10 to 40 g/l of Zn.sup.2+ ions, (c) from 10 to 100 g/l of OP.sub.4.sup.3- ions and, as accelerator, (d) from 10 to 100 g/l of NO.sub.3.sup.- ions and/or (e) from 0.1 to 2.0 g/l of organic nitro compounds, said solution exhibiting a pH value in the range of from 2.0 to 3.8 and a ratio of free acid to total acid of from 1:4 to 1:100.
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