Surface treatment of metal parts can be divided into four aspects:
1. Mechanical surface treatment: sand blasting, shot blasting, polishing, rolling,brushing, spraying, painting, oiling, etc.
2. Chemical surface treatment: blueing and blackened finished, phosphating, pickling, electroless plating , TD treatment, QPQ treatment, chemical oxidation, etc.
3. Electrochemical surface treatment: anodizing, electrochemical polishing, electroplating, etc.
4. Modern surface treatment: chemical vapor deposition CVD, physical vapor deposition PVD, ion implantation, ion plating, laser surface treatment, etc.
The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of the product.