Metal Finishing is a process that artificially forms a surface layer on the surface of a substrate that has different mechanical, physical and chemical properties from the substrate. The purpose of the Metal Finishing is to meet the corrosion resistance, wear resistance, decoration or other special functional requirements of the product. For metal castings, we commonly use Metal Finishing methods such as machine polishing, chemical treatment, surface heat treatment, and spray coating. Metal Finishing is to clean, sweep, deburr, degrease, descale, etc. to the surface of the workpiece.