Baths and additives for the electroplating of bright zinc
US4251331A · kind A · utility
9Cited by
4References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 17, 1980 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Jan 17, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A brightening agent is provided for the electrodeposition of zinc from an aqueous acid plating bath. The brightening agent is composed of an alpha-amino aliphatic carboxylic acid, a nonionic surface active compound and a carbonyl compound. The brightening agent may be added to an electroplating bath containing zinc ions, chloride ions, and boric acid. The use of the brightening agent eliminates the use of ammonium chloride as a bath constituent, and unexpectedly produces bright electrodeposits at extremely high current densities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.