Research On Micro-Arc Oxidation Of Rare Earth Magnesium Alloy

Magnesium alloy is the lightest metal materials with low density, low specific gravity, and have broad application prospects in the automotive, aerospace and other fields. However, the defects of poor corrosion resistance of magnesium alloy restricting its development. The rare earth magnesium alloy not only has the inherent advantages of magnesium alloy, but also can resist high temperature, creep resistance superior and other new benefits. Therefore, its surface treatment is particularly important. Owing to simple process, environmental protection and other advantages, Micro-arc oxidation technology overcome some of the shortcomings of traditional surface treatment technology become the hot foreign research. In the domestic, micro-arc oxidation technology is mainly used in aluminum alloys, magnesium alloys used in less research and for study of rare earth magnesium alloys even less. Based on the above, the paper focuses on the following:(1) By optimizing the experiment, study the electrolyte formula based on phosphate, silicate and aluminates salt system. Comparing with the three types of micro-arc oxidation ceramic membrane properties. The results show that the micro-arc oxidation ceramic coating surface of the aluminates salt system has the compactness and good corrosion resistance.(2) By adding different additives in the basic formula of phosphate salt base to explore additives on the properties of micro-arc oxidation ceramic membrane. The results show that the additives of H2O2have great influence in the improvement of the micro-arc oxidation ceramic membrane of the phosphate-based salt and the corrosion resistance.(3) For the first time using water-based acrylic resin as the sealing agent,and used in the rare earth magnesium alloy that after micro-arc oxidation treatment. Through the neutral salt spray test, the rare earth magnesium alloy after sealing can be achieved200h, compared the unsealed improved100h.