Coloured aluminium sheet anodised film has these five properties

Coloured aluminium sheet anodised film has these five properties

The first point: high hardness

The hardness of a coloured aluminium oxide film is higher than that of an aluminium alloy oxide film. Usually, its hardness is related to the alloy composition of the aluminium and the technical conditions of the electrolyte during anodising. The anodic oxide film is not only harder, but also has better wear resistance. In particular, the surface layer of porous oxide film has the ability to adsorb lubricants, which can further improve the wear resistance of the surface.

Second point: there is a high corrosion resistance

This is due to the anodic oxide film of coloured aluminium sheet has high chemical stability. The anodic oxide film of pure aluminium has been tested to have better corrosion resistance than the anodic oxide film of aluminium alloys. This is due to the alloy composition inclusions or the formation of metal compounds that cannot be oxidised or dissolved, while making the die-cast aluminium oxide film discontinuous or generating voids, thus making the corrosion resistance of the oxide film much lower. Therefore, the general anodic oxidation of the resulting film to be closed treatment, in order to improve its corrosion resistance.

The third point: there is a strong adsorption capacity

The anodic oxidation film of coloured aluminium sheet is porous in structure and has strong adsorption capacity, so it can further improve the protection, insulation, wear resistance and decorative properties of aluminium products by filling the holes with various pigments, lubricants, resins, etc.

The fourth point: there is good insulation performance

The anodic oxide film of coloured aluminium sheet does not have the conductive nature of metal, but becomes a good insulating material.

Fifth point: strong adiabatic and thermal resistance

This is because the thermal conductivity of the anodised film is much lower than that of pure aluminium? Anodic oxide film can withstand temperatures of about 1500 ℃, while pure aluminum can only withstand 660 ℃. In summary, coloured aluminium sheets are treated with chemical oxidation, especially anodic oxidation, and the oxide film formed on their surface has good protective and decorative properties. Therefore, it is widely used in aviation, electrical, electronic, machinery manufacturing and light industry.