Deposition of chromium oxides from a trivalent chromium solution containing a complexing agent for a buffer
US6004448A · kind A · utility
20Cited by
17References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D9/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A water-soluble composition of matter free of an added buffering agent, for electrolytically depositing a chromium oxide coating on a metal substrate is disclosed comprising a mixture of a complexing agent for a buffering agent such as a boron oxide complexing agent that might be introduced into the composition, a trivalent chromium compound, a weak chelating agent, an optional conductivity enhancing cation, an optional depolarizer, and an optional surfactant. A process is also described as well as a product obtained by the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.