In the 20th century, with the development of society, people's demand for cars is increasing. The wheel hub is an important part of the car, and the performance of the wheel hub is directly related to the performance of the vehicle.

　　The surface treatment method of magnesium alloy grinding wheel includes grinding the surface of magnesium alloy grinding wheel to remove oil stain, and ultrasonic cleaning after anodic electrophoresis; then micro arc oxidation treatment, spraying, cleaning and drying, and then nickel plating, water washing and drying; cathodic electrophoresis, water washing and curing; intermediate coating drying by acrylic resin, spraying top coat and curing.

　　In this method, a layer of electrophoretic paint film is formed on the surface of the workpiece, and a uniform, smooth and strong adhesion paint film is formed at all parts of the wheel hub, and then a layer of nickel plated micro arc oxidation layer is formed on the surface of the paint film, which is solidified by cathodic electrophoresis, intermediate paint and spraying surface paint.

　　The surface of aluminum alloy wheel hub was mechanically polished, and the surface was treated with alkaline etching. The surface of aluminum alloy wheel hub was rough polished with electrolyte with high acid concentration, and the aluminum alloy wheel hub was polished with low acid concentration electrolyte.