Anodic electrocoating of aluminum to obtain improved corrosion resistance
US4312800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1978 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Jul 14, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/901
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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 dissolves 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.