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Properties of colored aluminum anodic oxide films

Release time:

2021-09-15 16:11

The first point: high hardness

The hardness of pure aluminum oxide film is higher than that of aluminum alloy oxide film. Usually, its hardness is related to the alloy composition of aluminum and the technical conditions of the electrolyte during anodic oxidation. The anodic oxide film not only has high hardness, but also has good wear resistance. In particular, the porous oxide film on the surface layer has the ability to adsorb lubricants, which can further improve the wear resistance of the surface.

 

The second point: high corrosion resistance

This is due to the high chemical stability of the anodic oxide film. After testing, the anodic oxide film of pure aluminum has better corrosion resistance than the anodic oxide film of aluminum alloy. This is due to the inclusion of alloy components or the formation of metal compounds can not be oxidized or dissolved, so that the die-cast aluminum oxide film is discontinuous or produce voids, so that the corrosion resistance of the oxide film is greatly reduced. Therefore, the film obtained after anodizing is generally sealed to improve its corrosion resistance.

The third point: there is a strong adsorption capacity.

The anodic oxide film of aluminum and aluminum alloy is porous structure and has strong adsorption capacity. Therefore, filling various pigments, lubricants and resins in the holes can further improve the protection, insulation, wear resistance and decoration performance of aluminum products.

 

The fourth point: have good insulation performance

Anodic oxide films of aluminum and aluminum alloys no longer have the conductive properties of metals and have become good insulating materials.

The fifth point: thermal insulation resistance is strong

This is because the thermal conductivity of the anodic oxide film is much lower than that of pure aluminum.? The anodic oxide film can withstand temperature of about 1500 ℃, while pure aluminum can only withstand 660 ℃. Good to sum up, aluminum and aluminum alloy by chemical oxidation treatment, especially after anodic oxidation treatment, the oxide film formed on its surface has good protection and decoration characteristics. Therefore, it is widely used in aviation, electrical, electronics, machinery manufacturing and light industry.