Passivating and silver removal method
US4363705A · kind A · utility
2Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1981 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Jul 16, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D1/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In the production of records, a mother is formed from a metal master having a nickel core and a silver coating. To produce the mother, the silver coating is removed from the nickel core and the nickel is passivated by treating the metal master with an aqueous solution containing ammonium persulphate. The same aqueous solution can be used for passivating the mother before the mother is electroplated to form a stamper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.