Protection of lead-containing anodes during chromium electroplating
US5453175A · kind A · utility
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16Claims
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Key dates
| Filing date | Jun 30, 1994 |
| Grant date | Sep 26, 1995 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention provides an improved method for electroplating chromium, using lead anodes, while achieving the advantages of using methanesulfonic acid without suffering the excessive anode-corrosion characteristics associated with that acid. Accordingly, chromium is electrodeposited from a bath containing chromic acid, sulfate ion and an alkylpolysulfonic acid containing from one to about three carbon atoms. The preferred alkylpolysulfonic acid is methanedisulfonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.