Brightener for zinc-nickel plating bath and method of electroplating
US6468411B1 · kind B1 · utility
5Cited by
18References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jul 11, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/565
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An alkaline zinc-nickel electroplating bath comprises zinc ions, nickel ions, a primary brightener which is an N-methylpyridinium compound substituted at the 3-position of the pyridine ring with a carboxylate group or a group hydrolyzable to a carboxylate group and a secondary brightener which is an aliphatic amine. An example of a preferred brightener is N-methylpyridinium-3-carboxylate or a salt thereof. A preferred polyamine is a polyethyleimine. By the present invention, a mirror bright zinc-nickel deposit can be obtained having more than 4% by weight nickel, without blistering or decomposition of the primary brightener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.