What are the requirements of aluminum oxide surface effect?

The requirements for the oxidized surface effect of aluminum alloy mainly involve a number of aspects to ensure that the treated aluminum alloy surface is both beautiful and has the required functionality. The following are the specific requirements for the oxidized surface effect of aluminum alloy:

1. Appearance requirements

① No defects: the surface of oxidized parts should be free of spots, white, black spots, pinholes, different colors, bubbles, deformation, mist, watermark, foreign bodies, roughness, scratches and other defects. Minor scratches are acceptable, but generally should be controlled to a degree that does not affect the overall appearance.

Color consistency: For oxidation layers that require a specific color, such as yellow conductive oxidation, it is necessary to compare the color difference with the customer's signature color plate to ensure that the color meets the requirements.

Second, performance requirements

① Wear resistance: The oxide film formed on the surface of the aluminum alloy after anodization should have a high hardness, generally between 520 microns, and the hard anodized oxide film can reach 60200 microns, which can effectively resist external wear.

Corrosion resistance: the oxide film should have good corrosion resistance and can maintain long-term stability under certain environmental conditions. For anodized films, it is usually necessary to seal them to improve their corrosion resistance.

(3) Insulation: the surface of the anodized aluminum alloy becomes a good insulating material and no longer has the conductive properties of the metal.

(4) Adsorption: the porous structure of the oxide film makes it have a strong adsorption capacity, which can adsorb various pigments, lubricants, etc., and further improve the function and decoration of aluminum.

⑤ Temperature resistance: the anodized film can withstand temperatures of about 1500 ° C, and the melting point of pure aluminum is only 660 ° C, which makes the anodized aluminum alloy can also maintain good stability under high temperature environment.

Iii. Other requirements

① Environmental protection: With the enhancement of environmental protection awareness, the pollution to the environment should be minimized during the oxidation treatment of aluminum alloy. For example, RoHS compliance requirements indicate that products should meet environmental standards and be free of hazardous substances.

Adhesion: There should be good adhesion between the oxide film and the substrate to ensure that it will not fall off during use. This is usually verified by an adhesion test, such as a paste test using 3M standard tape.

4. Inspection standards

In order to ensure that the oxidized surface effect of aluminum alloy meets the requirements, a series of tests are usually carried out, including contact resistance test, salt spray test, adhesion test, etc. These tests are designed to assess key indicators such as the electrical properties, corrosion resistance and adhesion of the oxide film.