Study On Magnesium Alloy Of Micro-Arc Oxidation Mechanisms And Properties Of Super Anti-corrosion Films

Micro-arc oxidation that is developed based on anodic oxidation is a new technology that grows ceramic membrane by in-situ on the surface of aluminum, titanium, magnesium and its alloys. Compared to the traditional anodic film, micro-arc oxidation ceramic coating pressents a series of advantages, such as with the substrate integrated tightly, and good resistance against corrosion, abrasion, high temperature and high temperature ablation and good insulation, so it has been a focus of surface treatment technology research in domestic and international. However, the process of forming super anti-corrosion MAO film on magnesium alloy under small current density and the research of film-forming mechanism is still imperfect, so it needs further exploration and research to provide better technical services for the defense, aerospace, weapons and equipment and other developments in the field.In this paper, a process of forming super anti-corrosion MAO film on magnesium alloy ZM5 under small current density was developed. The influences of super anti-corrosion MAO film were studied deeply. Different electrolysis Fluid systems were studied in the orthogonal design method, and the optimula formula was determined. By quadratic regression orthogonal rotation experiments design, the quadratic regression equations of thickness and corrosion resistance were established. Using SEM, EDS and XRD analysis methods and other modern means of corrosion films on ultra-micro structure, elemental composition and phase composition were tested. Furthermore, the influence of adding Electromagnetic fields to the super anti-corrosion MAO film on magnesium alloy was studied. And the growth mechanisms of color film were dissussed.By experimental findings, the growth process model of super anti-corrosion MAO film on magnesium alloy ZM5 under small current density were built, and the reactions occurring in MAO process were deduced. Using the analysis on the electrolyte membrane of different phase composition, the intrinsic motivation that better anti-corrosion film could be grown in aluminate electrolyte was been stated in the growth mechanism.