Aluminum alloy stamping parts have the characteristics of low density, good electrical and thermal conductivity, and excellent corrosion resistance. The surface treatment of aluminum alloy can meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of the products. The common surface treatments of aluminum alloy include spraying, baking paint, electroplating, anodizing, impregnation, spraying oil, and sandblasting.

1. Spraying: It uses pressure or electrostatic force to attach paint or powder to the surface of the workpiece, giving the workpiece the functions of anti-corrosion and appearance decoration.

2. Baking paint: On the substrate, apply primer and topcoat, and each time the coating is applied, send it into a dust-free and constant temperature oven for baking.

3. Electroplating: It is a process that uses electrolysis to make the surface of metal or other material parts attach a layer of metal film. It can prevent corrosion, improve wear resistance, electrical conductivity, reflectivity, and enhance appearance, etc.

4. Anodizing: Electrochemical oxidation of metal or alloy. The metal or alloy parts are used as the anode, and the electrolytic method is adopted to form an oxide film on the surface. The metal oxide film changes the surface state and performance, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, and protecting the metal surface, etc.

5. Impregnation: The sealing medium (usually a low-viscosity liquid) is infiltrated into the micropores (fine cracks) through natural penetration (i.e., micro-pore self-absorption), vacuum pumping and pressurization, etc., filling the gaps completely. Then, through natural (room temperature), cooling or heating methods, the sealing medium in the gaps is solidified to achieve the sealing of the gaps.

6. Spraying oil: Applying paint to the surface of the product through a natural drying method.

7. Sandblasting: Using compressed air as the power source, a high-speed jet beam is formed to spray the abrasive (copper ore sand, quartz sand, diamond sand, iron sand, sea sand) at high speed onto the surface of the workpiece to change the surface appearance or shape of the workpiece.

Due to the impact and cutting action of the abrasive on the workpiece surface, the surface of the workpiece gains a certain degree of cleanliness and different roughness, improving the mechanical properties of the workpiece. Therefore, it enhances the fatigue resistance of the workpiece, increases the adhesion between it and the coating, prolongs the durability of the coating, and is also conducive to the leveling and decoration of the coating.