Views: 52 Author: Site Editor Publish Time: 2024-08-23 Origin: Site
Anodic oxidation process is a surface treatment technology that forms an oxide film on the metal surface through electrolysis reaction. The process of using aluminium or aluminium alloy products as anode, placing them in electrolyte solution for electrification, and using electrolysis to form aluminium oxide film on their surfaces is called anodic oxidation treatment of aluminium and aluminium alloy.
1. Surface pretreatment: chemical or physical methods of cleaning the surface of the profile, bare pure substrate, in order to facilitate the acquisition of complete, dense artificial oxide film. It is also possible to obtain a mirror or non-glossy (matt) surface by mechanical means.
2. Anodic oxidation: After surface pretreatment of the profile, under certain process conditions, the substrate surface anodic oxidation occurs, generating a layer of dense, porous, strong adsorption Al₂O₃ film layer.
3. Sealing pore: Use HT800 high temperature sealing agent, etc. to close the membrane pore pores of the porous oxide film generated after anodic oxidation, so that the oxide film can prevent contamination, corrosion resistance and wear-resistant performance enhancement.
1. Increase corrosion resistance: the oxide film can protect the metal surface from corrosion.
2. Increased hardness and wear resistance: the oxide film has high hardness and wear resistance.
3. Improve decorative properties: it can be used to make the metal surface show various colours and luster through colouring and other methods.
4. Improvement of insulating properties: The oxide film has good insulating properties.
5. Enhancement of adsorption capacity: the porous structure of the oxide film gives it a strong adsorption capacity.
Anodic oxidation process is widely used in the surface treatment of non-ferrous metals and their alloys such as aluminium, magnesium, etc. It can be used in aerospace, automotive, construction, electronics and other field
Anodic oxidation film has high electrical resistivity, can play a good role in electrical insulation, can be used in the insulation requirements of electronic components, electrical equipment and other products, to prevent current leakage and short-circuit and other problems, to improve the safety and reliability of the product.
After anodic oxidation treatment of the metal surface, its microstructure becomes rougher, forming many tiny pores and uneven surface, which provides a good adhesion basis for the subsequent coating, and significantly improves the bonding force between the coating and the metal substrate, making the coating more solid and less likely to fall off, and further enhances the protective and decorative effect.
Anodic oxidation process generally does not involve the use of heavy metals, toxic and hazardous substances, compared with some traditional surface treatment processes, such as chrome plating, cadmium plating, etc., less harmful to the environment and human health, more in line with modern environmental protection requirements.
The anodic oxidation process is relatively mature, through precise control of electrolyte composition, current density, oxidation time and other process parameters, you can obtain a stable and consistent quality of the oxide film, to ensure the stability of the product's performance and appearance, suitable for large-scale industrial production.
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