Micro-arc oxidation or micro-plasma surface ceramization technology, refers to the ordinary anodic oxidation on the basis of the use of arc discharge to enhance and activate the reaction that occurs on the anode, so as to form a high-quality strengthened ceramic film on the surface of the workpiece aluminum, titanium, magnesium metal and its alloys as the material of the method, is through the use of special micro-arc oxidation power supply voltage applied on the workpiece, so that the metal on the surface of the workpiece with electrolyte By applying voltage to the workpiece with a special micro-arc oxidation power supply, the metal on the surface of the workpiece interacts with the electrolyte solution to form a micro-arc discharge on the surface of the workpiece and a ceramic film is formed on the surface of the metal under the action of high temperature, electric field and other factors, so as to achieve the purpose of strengthening the workpiece surface.
The salient features of the micro-arc oxidation technology are: (1) a substantial increase in the surface hardness of the material, micro-hardness in the 1000 to 2000HV, up to 3000HV, comparable to cemented carbide, and greatly exceeds the hardness of heat-treated high-carbon steel, high-alloy steel and high-speed tool steel; (2) good abrasion resistance; (3) good heat resistance and corrosion resistance. This fundamentally overcomes the shortcomings of aluminum, magnesium, titanium alloy materials in the application, so the technology has a broad application prospects; (4) good insulation properties, insulation resistance of up to 100MΩ. (5) The solution is environmentally friendly, in line with the requirements of environmental protection emissions. (6) The process is stable and reliable, and the equipment is simple. (7) The reaction is carried out at room temperature, convenient operation, easy to master. (8) The substrate in situ growth of ceramic membrane, combined with solid, dense and uniform ceramic membrane.