Anodic electrocoating of aluminum to obtain improved...

Details Anodic electrocoating of aluminum to obtain improved... Anodic electrocoating of aluminum to obtain improved...

C - Chemistry, Metallurgy

08

K

400/5119, 400/92

C08K 3/00 (2006.01) C09D 5/44 (2006.01) C23D 15/00 (2006.01)

Patent

CA 1131377

ABSTRACT There is disclosed an aqueous anodic electrodeposition bath adapted to electrodeposit substantially clear coatings possessing superior corrosion resistance on aluminum substrates in which water has dispersed therein a carboxy-functional polymer at least partially neutralized with a volatile base together with from 0.08 to 0.5 part, per 1000 parts of the bath, of finely divided particles of pigment grade. The carboxyl-functional polymer preferably comprises a copolymer formed by polymerization in aqueous dispersion of the monomers in solution in an appropriate polyhydric alcohol. The pigment is preferably suspended in a carboxyl-functional resin which dissolved in water with the aid of a base. The preferred soluble resin is a copolymer with an oleyl alcohol ether of a polyepoxide and the preferred pigment is barium chromate.

331795

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