Surface treatment is an additional process applied to the surface of a material for the purpose of adding functions such as rust and wear resistance or improving the decorative properties to enhance its appearance.
Painting, such as that applied to the body of an automobile, printing of the manufacturer’s name and other information on the surface of home appliances, and “plating” applied under the paint on guardrails, are typical examples of surface treatment.
Heat treatment, such as quenching, applied to metal parts such as gears and blades, is also classified as surface treatment.
Surface treatments can be broadly classified into removal processes, such as scraping or melting the surface, and additive processes, such as painting, which add something else to the surface.
Surface finishing：
| Aluminum Parts | Stainless Steel Parts | Brass Parts | Steel Parts |
| Clear anodized | Polishing | Nickel plating | Zinc plating |
| Multicolor anodized | Passivating | Chrome plating | Oxide black |
| Sand blasting | Sand blasting | Eletrophoresis black | Nickel plating |
| Powder Coating | Laser engraving | Oxide black | Chrome plating |
| Brushing | Eletrophoresis black | Powder Coating | Heat Treatment |
| Chroming | Oxide black | Polishing | Powder Coating |
Black anodized
Multicolor anodized
Brushing
Polishing
Zinc plating
Laser etching
Heat Treatment:It refers to the controlled process of heating and cooling a material in order to improve its properties, performance, and strength.