Making galvanized steel with excellent darkening resistance
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United States of America Patent
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Dec 5, 1995
Grant Date -
N/A
app pub date -
Sep 15, 1994
filing date -
Mar 17, 1992
priority date (Note) -
Expired
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Abstract
To form a darkening-resistant chromate ram on the surface of a galvanized steel sheet, the surface of the galvanized steel shut is treated with a phosphate treatment solution before it is chromate-treated in such a way that zinc phosphate crystals will cover from 10-60% of the substrate surface.
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