Aqueous solution of monovalent gold and ammonium sulfite complex, process for the preparation thereof and electrolytic bath obtained therefrom for the plating of gold or gold alloys
US4192723A · kind A · utility
17Cited by
4References
12Claims
0Family size
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Key dates
| Filing date | Aug 8, 1978 |
| Grant date | Mar 11, 1980 |
| Priority date | — |
| Expiry date | Aug 8, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G7/006
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Aqueous solution of monovalent gold and ammonium sulfite complex. As opposed to the corresponding alkali-gold sulfite solution, this solution is stable under slightly acidic pH conditions and can be used advantageously for preparing electrolytic baths for the plating of gold and gold alloys having a great flexibility of use and a particularly long working life. This solution is prepared, in a very economical manner, by adding ammonia to an HAuCl.sub.4 solution which results in the formation of a precipitate, then by dissolving this precipitate in an aqueous ammonium sulfite solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.