Hexavalent chromium-free phosphate-bonded coatings
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United States of America Patent
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May 1, 2001
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app pub date -
Oct 13, 1998
filing date -
Oct 13, 1998
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Abstract
A heat curable bonding composition of the present invention comprises an aqueous solution containing phosphate ion (PO.sub.4.sup.-3) and chromium(III) ion (Cr.sup.+3, or trivalent chromium) and is substantially free of hexavalent chromium ions. The bonding composition may further contain at least one secondary cationic species. The bonding composition has a pH in the range of about 1 to about 3.5.
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