Micro-arc oxidation or micro plasma on the surface of ceramic technology, refers to the ordinary anodic oxidation, on the basis of using the arc discharge to enhance and activate the reaction taking place at the anode, thereby in aluminum, titanium, magnesium and its alloy workpiece surface quality way to strengthen the ceramic membrane is by using a dedicated micro-arc oxidation power supply voltage on the workpiece, the interaction between metal and the electrolyte solution on the surface of the workpiece, the workpiece surface formation, micro-arc discharge under the effect of factors such as high temperature, electric field, the metal surface of ceramic membrane, achieve the goal of workpiece surface strengthening.

The outstanding characteristic of micro-arc oxidation technology is: (1) to greatly improve the surface hardness of the material, microhardness from 1000 to 1000 hv, up to 3000 hv, equivalent to that of cemented carbide, considerably more than high carbon steel after heat treatment, the hardness of high alloy steel and high-speed tool steel; (2) good wear resistance; (3) good heat resistance and corrosion resistance. This fundamentally overcome the shortcomings in aluminum, magnesium and titanium alloy materials in application, so this technology has broad application prospects; (4) have good insulation, insulation resistance up to 100 m Ω. (5) solution for the environmental protection, comply with the requirement of environment protection. (6) process is stable and reliable, simple devices. (7) reaction at room temperature, easy to operate, easy to master. (8) ceramic membrane matrix in situ growth, combined with strong, ceramic membrane density uniform.