Why is film treatment applied after aluminum alloy die-casting is completed?
The main purpose of applying film treatment to aluminum alloy is to enhance its surface properties and improve its corrosion resistance, hardness, aesthetics and wear resistance. Aluminum alloy itself has good mechanical properties, but its surface is easily oxidized, which may cause corrosion and affect the appearance. The main purposes and advantages of film treatment are as follows:
1. Enhance corrosion resistance:
Aluminum alloys are prone to oxidation and corrosion in humid environments. Through film treatment (such as anodizing), a dense oxide film is formed on the surface, which can effectively block the contact of air, moisture and other corrosive substances, and improve weather resistance and corrosion resistance.
2. Improve surface hardness and wear resistance:
Film treatment can increase the hardness of the aluminum alloy surface, especially the oxide layer after anodization. Its hardness is higher than that of the aluminum itself, which helps to reduce scratches and wear and extend the life of parts. service life.
3. Enhance adhesion and aesthetics:
The aluminum alloy surface after film treatment is more likely to adhere to various coatings, such as pigments, paint films or electroplating layers, thereby improving the appearance. In addition, it can be dyed after anodization, giving aluminum alloy products a variety of color options to enhance their decorative effect and aesthetics.
4. Improve insulation performance:
Anodizing treatment can form an oxide film with insulating properties on the surface of the aluminum alloy, increasing its electrical insulation, thus providing better safety in electrical equipment and other occasions.
5. Anti-fingerprint and easy to clean:
After film treatment, the aluminum alloy surface becomes less likely to leave fingerprints or oil stains, and it is more convenient to clean and maintain. This is an important advantage for aluminum alloy products that require frequent contact.
Common aluminum alloy film treatment methods include anodizing, chemical conversion treatment (such as aluminum chromate treatment) and electrophoretic coating. Through these film treatments, aluminum alloys not only have better durability, but also improve the appearance and texture of products, meeting the needs of different industries for high-quality aluminum alloy materials.