Patent ID: 6755918
Filing Date: 2004-06-29
Classification: C23C

Abstract:
A method for treating magnesium alloy by chemical conversion, comprising:(1) providing a magnesium alloy having at least one surface for treatment; (2) alkaline cleaning of said surface of said magnesium alloy with an alkali cleaner; (3) rinsing said magnesium alloy with water to eliminate said alkali cleaner; (4) acid pickling said magnesium alloy with acid pickling agent to remove oxides and metal impurities on said surface; (5) treating said surface of said magnesium alloy with a chemical conversion coating agent to form a surface film having properties of corrosion resistance, enhancing paint adhesion as well as colorful appearance; and (6) treating said surface with a sealing agent to reinforce corrosion resistance and paint adhesion to said surface film; wherein said chemical conversion processing agent comprises a metal salt, a reaction enhancing agent, pH adjusting agent and a solvent, wherein said metal salt is selected from the group consisting of V2O5, ammonium orthovanadate, ammonium metavanadate and CeCl3, and has a concentration ranging from 10 to 80 g/L, and said reaction enhancing agent is fluorinated alkyl quaternary ammonium iodides, and has a concentration ranging from 100 to 800 ppm (V/V), and said pH adjusting agent is selected from the group consisting of acetic acid, formic acid, sodium hydroxide, ammonia and ethylene diamine, and said solvent is water, methanol or ethanol.