Zinc phosphate coating process
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United States of America Patent
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Sep 12, 1989
Grant Date -
N/A
app pub date -
Oct 30, 1987
filing date -
Oct 30, 1987
priority date (Note) -
Expired
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Abstract
The present invention relates to a composition and process for metal finishing involving the formation of zinc phosphate coatings of desired morphology on a ferrous surface. The inclusion of a hydroxylamine agent in the phosphating bath expands the range of zinc concentrations over which the desired coating morphology is obtained. Zinc and aluminum surface can also be coated with this composition and process.
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