Baths and process for electroplating hard,adherent,smooth, wear resistant and corrosion resistant chromium deposits
US4836897A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Sep 1, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Corrosion resistant electrodeposited chromium layers, processes for their electrodepositions and plating baths suitable for use therein are disclosed. The corrosion resistant chromium layers also are bright, adherent, smooth, hard, wear resistant, and exhibit a low coefficient of friction. Electrodeposition is carried out at both high and low currrent densities. The baths used comprise 450-650 g/l of chromic acid, 40-100 g/l of sulfoacetic acid and 0-4.5 g/l of sulfate ion and are substantially free of other carboxylic acids, fluoride ions, iodide ions, bromide ions and selenium ions. The baths used comprise 400-650 g/l of chromic acid, 40-100 g/l of sulfoacetic acid and 0-4.5 g/l of sulfate ion and are substantially free of other carboxylic acids, flouride ions, iodide ions, bromide ions and selenium ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.