Surface treatment is a process that artificially forms a layer on the surface of CNC machined parts that is different from the mechanical, physical and chemical properties of the part. The purpose of surface treatment is to meet the corrosion resistance, wear resistance, decoration or other special functional requirements of the parts. For metal CNC parts, our more commonly used surface treatment methods are mechanical grinding, chemical treatment, surface heat treatment, surface spraying. Surface treatment is to clean, sweep, deburr, remove oil stains, remove scale, etc. on the surface of the workpiece.