Method for conversion treating surface of magnesium alloy workpiece
US8262810B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Mar 11, 2011 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Mar 11, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for conversion treating a surface of a magnesium alloy workpiece includes the steps of degreasing, acid pickling, alkali pickling, and chemical converting. A phosphating solution is used in the step of chemical converting and includes the following solution concentrations: 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.