Advantages of aluminum anodized surface treatment

2024-04-02 10:56:55

Anodizing is a metal surface oxidation process, and its objects can be aluminum and aluminum alloys, magnesium alloys, titanium and titanium alloys, etc. Among them, the fastest growing and most widely used is the anodizing of aluminum and aluminum alloys.

In order to overcome the defects of aluminum alloy surface hardness, wear resistance, etc., expand the scope of application, and extend the service life, surface treatment technology has become an indispensable part of the use of aluminum alloys, and anodizing technology is the most widely used and successful. 

 aluminum anodized surface treatment

The aluminum alloy anodizing pre-treatment process is an important part of determining the appearance quality of the product. For example, 1060 anodized transformer aluminum strip can effectively reduce the risk of transformer short circuit; 5052 anodized aluminum plate is the representative of high-end curtain wall panels; 6061 aluminum forgings can be better for car wheels. The oxide film obtained after anodizing these aluminum alloys can effectively improve the original properties of the aluminum alloy so that it can serve us better.

Advantages of Aluminum Anodized Surface Treatment

▶Has higher hardness

The hardness of pure aluminum oxide film is higher than that of aluminum alloy oxide film. Generally, its hardness is related to the alloy composition of aluminum and the process conditions of the electrolyte during anodization. The anodized film not only has higher hardness, but also has better wear resistance. In particular, the porous oxide film on the surface layer has the ability to absorb lubricants and can further improve the wear resistance of the surface.

▶High corrosion resistance

This is due to the high chemical stability of the anodized film. After testing, the anodized film of pure aluminum has better corrosion resistance than the anodized film of aluminum alloy. This is because the alloy components are mixed or form metal compounds that cannot be oxidized or dissolved, causing the oxide film to be discontinuous or create gaps, thereby making the The corrosion resistance of the oxide film is greatly reduced. Therefore, generally the film obtained after anodization must be sealed to improve its corrosion resistance.

▶Has strong adsorption capacity

The anodized film of aluminum and aluminum alloys has a porous structure and has strong adsorption capacity, so filling the pores with various pigments, lubricants, resins, etc. can further improve the protection, insulation, wear resistance and decorative properties of aluminum products.

▶Has good insulation properties

The anodized film of aluminum and aluminum alloys no longer has the conductive properties of metal and has become a good insulating material.

▶Has strong thermal insulation and heat resistance

The thermal conductivity of the anodized film is much lower than that of pure aluminum. The anodized film can withstand temperatures of about 1500°C, while pure aluminum can only withstand 660°C.

After chemical oxidation treatment of aluminum and aluminum alloys, especially anodization treatment, the oxide film formed on the surface has good protection, decoration and other properties. Therefore, it is widely used in aviation, electrical, electronics, machinery manufacturing and light industry.


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