Patent ID: 8262810
Filing Date: 2012-09-11
Classification: C23C

Abstract:
1. A method for conversion treating a surface of a magnesium alloy workpiece, the method comprising the steps of degreasing, acid pickling, alkali pickling, and chemical converting, wherein a phosphating solution used in the step of chemical converting comprises: 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.