Non-cyanide electroplating solution for gold or alloys thereof
US5277790A · kind A · utility
10Cited by
12References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 10, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Jul 10, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/62
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed are cyanide free electroplating solutions for gold or alloys thereof; said solutions comprising gold in the form of a soluble sulfite complex, an added source of sulfite and/or bisulfite ion and a supporting electrolyte; and said solutions further comprising both an organic polyamine or mixture of polyamines of molecular weight from about 60 to 50,000, and an aromatic organic nitro compound; wherein the pH of said solutions is below about 6.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.