Surface treatment is a process that artificially forms a layer on the surface of a base material that has different mechanical, physical and chemical properties from the base material. The purpose of surface treatment is to meet the corrosion resistance, wear resistance, decoration or other special functional requirements of the product. For metal castings, commonly used surface treatment methods include mechanical grinding, chemical treatment, surface heat treatment, and surface spraying. Surface treatment purpose to clean, sweep, deburr, remove oil, and remove scale on the surface of the workpiece.