Method and composition for treatment of aluminum
AssigneeBetz Laboratories, Inc.
InventorsDavid W. Reichgott, Fu Chen
Life of this patent
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Abstract
Methods of forming a dried in place conversion coating on metal surfaces such as aluminum and aluminum alloys. The methods comprise contacting the metal with an aqueous solution of a water soluble maleic or acrylic acid/allyl ether copolymer alone or with an acid.
Claims10
A method of pretreating a metal surface prior to coating comprising reacting the metal surface with an aqueous solution of water soluble or water dispersible polymers having repeat units represented by the formula ##STR7## wherein E is the repeat unit remaining after polymerization of an alpha, beta ethylenically unsaturated compound, R.sub.1 is H or ##STR8## monohydroxylated C1-C8 alkyl, monohydroxylated C1-C8 alkylene, di-or polyhydroxy C1-C8 alkylene, n is an integer of from 1 to about 20, a is 0 or 1, R.sub.3 is hydrogen or an acetate formed by reacting an acetylating agent with an allyl ether, the molar ratio of repeat units c:d is from about 15:1 to about 1:10;
- and optionally an acid selected from the group consisting of acetic acid, glycolic acid, dihydrohexafluotitanic acid, dihydrohexafluosilicic acid, dihydrohexafluozirconic acid and fluoboric acid and combinations thereof wherein said aqueous solution is rinsed or dried in place.
Dependencies are inferred from the claim text.