Process for treating a metal surface with an acidic solution containing hydrogen peroxide and a stabilizer
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United States of America Patent
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Jan 23, 2001
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N/A
app pub date -
Mar 20, 2000
filing date -
Oct 7, 1996
priority date (Note) -
Expired
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Abstract
Aqueous acidic solutions of hydrogen peroxide used for metal surface treatments suffer from an increased decomposition rate of the hydrogen peroxide, caused by the dissolved metals such as iron, copper or titanium. A method is provided wherein stabilization can be achieved by employing a combination of a) a hydroxybenzoic acid, preferably p-hydroxybenzoic acid; b) a hydrotropic sulphonic acid, preferably p-toluene sulphonic acid; and c) a hydrophobic alkaryl sulphonic acid, preferably dodecylbenzene sulphonic acid.
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