Phosphating solution and method for conversion treating surface of magnesium alloy workpiece
US7942983B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Jul 3, 2008 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Oct 26, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An exemplary phosphating solution is used for conversion treating a surface of a magnesium alloy workpiece. The phosphating solution includes: 2.89 gram/liter to 8.67 gram/liter of phosphoric acid, 0.3 gram/liter to 1.0 gram/liter of carbamide, 0.39 gram/liter to 1.56 gram/liter of nitric acid, 6 gram/liter to 30 gram/liter of manganese dihydrogen phosphate, and 0.2 gram/liter to 0.6 gram/liter of tannin. A method for conversion treating a surface of a magnesium alloy workpiece is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.