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US 4,992,116 AGranted
Method and composition for coating aluminum
AssigneeHenkel Corporation
InventorLydia Hallman
Life of this patent
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Abstract
The invention is a composition and method for treating aluminum. The composition comprises phosphonic acid, fluorozirconic acid, fluorotitanic acid, fluorohafnic acid, or fluorosilicic acid and a Mannich adduct of an polyalkenyl phenol or tannin. The aluminum is treated by contact with the composition. An inorganic-organic conversion coating is applied to the aluminum in a single step.
Claims9
A non-chromium aqueous coating composition for an aluminum substrate which comprises (a) from about 1.1.times.10.sup.-5 to about 5.3.times.10.sup.-3 mols per liter of PO.sub.4.sup.-3 ;
- (b) from about 1.1.times.10.sup.-5 to about 1.3.times.10.sup.-3 mols per liter of a fluoroacid of an element selected from the group consisting of Zr, Ti, Hf, and Si;
- (c) from about 0.26 to about 20.0 grams per liter of a polyphenol composition, the polyphenol composition comprising a Mannich Adduct of an amine with a member selected from the group consisting of polyalkenyl-phenols and tannins;
- and (d) water wherein the pH of the composition is from about 2.5 to about 5.0 and the mole ratio of the fluoroacid to the PO.sub.4.sup.-3 is from about 2:5:1 to about 1:10.
A concentrate comprising:
- from about 5.5.times.10.sup.-4 to about 0.275 mols/liter PO.sub.4.sup.-3 ;
- from about 5.5.times.10.sup.-4 to about 6.5.times.10.sup.-2 mols/liter fluoroacid of an element selected from the group consisting of Zr, Ti, Hf, and Si;
- and from about 13 to about 100 grams/liter of a polyphenol composition, the polyphenol composition comprising a Mannich Adduct of an amine with a member selected from the group consisting of polyalkenyl-phenols and tannins, wherein the mol ratio of fluoroacid to PO.sub.4.sup.-3 is from about 2.5:1 to about 1:10.
Dependencies are inferred from the claim text.