Phosphating method accelerated by N-oxides
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United States of America Patent
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Apr 30, 2002
Grant Date -
N/A
app pub date -
Jan 10, 2001
filing date -
Aug 6, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An acidic aqueous phosphating solution is presented having 0.2 to 3 g/l of zinc ions, 3 to 50 g/l of phosphate ions expressed as PO.sub.4.sup.-3, and 0.05 to 4 g/l of an organic N-oxide containing a saturated, unsaturated or aromatic 5- or 6-membered ring system, where the N atom of the N-oxide is part of said ring system, and where the ratio by weight of phosphate ions to zinc ions is from 3.7 to 30:1. The solution is free of hydroxylamine and useful in phosphating metal surfaces.
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