Cathodic electrophoresis is generally used as the primer for the whole vehicle, and the classic surface treatment technology - ternary phosphating treatment can be used; Or adopt environmentally friendly silane treatment technology, which is easy to operate and greatly reduces the comprehensive cost of subsequent wastewater treatment. The product quality meets the requirements of the automobile industry. The adhesion is grade 0 and the neutral salt spray corrosion resistance test time can be more than 1000h.