Use of hydroxy carboxylic acids as ductilizers for electroplating nickel-tungsten alloys
US5853556A · kind A · utility
8Cited by
10References
20Claims
0Family size
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Key dates
| Filing date | May 22, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | May 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for tungsten alloy plating wherein a tungsten replenisher concentrate of tungsten ions pre-complexed with a hydroxy carboxylic acid is used for maintenance additions to the bath. A preferred additive includes from about 100 to about 120 g/l of tungsten ions complexed with from about 120 to about 220 g/l of citric acid. The process provides consistent cathode efficiency and produces ductile deposits of tungsten alloy electroplate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.