Compositions and methods for darkening and imparting corrosion-resistant properties to zinc or other active metals
US7641743B2 · kind B2 · utility
2Cited by
16References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2004 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Apr 5, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/40
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Methods and compositions that serve to both darken a zinc or other active! metal surface and impart corrosion-resistant properties thereto, are disclosed. The compositions include an aqueous solution containing about 0.1 percent to about 5 percent ammonium chloride and about 0.1 percent to about 5 percent ammonium molybdate. The compositions utilize particular ratios of concentrations of ammonium chloride and ammonium molybdate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.