PHOSPHATING SOLUTION WITH HYDROGEN PEROXIDE AND CHELATING CARBOXYLIC ACIDS
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United States of America Patent
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app pub date -
Mar 26, 2008
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Sep 30, 2005
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Abstract
The invention relates to a phosphating solution and a process for the phosphating of metallic surfaces with aqueous, acidic phosphating solutions that comprise zinc and phosphate ions, at least one source of peroxide and one or more aliphatic chelating carboxylic acids containing 2 to 7 carbon atoms; the phosphating solution having a free acid content of one point or less.
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