Cadmium plating baths and methods for electrodepositing bright cadmium deposits
US4270989A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1979 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Dec 21, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B11/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Cadmium electroplating baths are described which contain at least one phosphate, carboxylate, sulfonate or sulfate compound containing one or more alkylene oxide groups containing 2 or 3 carbon atoms and wherein at least one of the alkylene oxide groups in the sulfates is attached to an aryl group. The baths also can contain at least one organic brightener compound and particularly pyridine brightener compounds having the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently hydrogen, alkyl, alkoxy, alkene, mercapto, amino, halogen, aryl, arylalkyl, aminoalkyl, hydroxy, hydroxyalkyl, cyano, dialkylamide, aldoxime, benzo (b), pyrrolidinyl groups and the corresponding N-oxide compounds. Semi-bright to bright level cadmium coatings are obtained with these baths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.