Aqueous reaction solution and method of passivating workpieces having zinc or zinc alloy surfaces and use of a heteroaromatic compound
US8262811B2 · kind B2 · utility
1Cited by
11References
16Claims
0Family size
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Key dates
| Filing date | Jan 23, 2007 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Jun 18, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
For producing corrosion resistant yellow passivate layers on zinc and zinc alloy surfaces, an aqueous reaction solution is utilized that contains trivalent chromium ions, at least one acid as well as at least one heteroaromatic compound selected from the group comprising nicotinic acid, the salts and derivatives thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.