Common techniques for coloring aluminum profiles

[China Aluminum Industry Network] The use of aluminum profiles is becoming more and more widespread. In use, we will have many ways to surface treat aluminum profiles. Coloring is one of them. So how to color aluminum?

First of all, the first oxidation of aluminum, extrusion of aluminum alloy profiles, the corrosion resistance of the surface is not strong, must be anodized surface treatment to increase the aluminum corrosion resistance, wear resistance and appearance of the appearance.

Then the specific steps are as follows:

1. Surface pretreatment: Chemical or physical methods are used to clean the surface of the profile, exposing a pure matrix to facilitate obtaining a complete and dense artificial oxide film. It is also possible to obtain a specular or matt (matte) surface by mechanical means.

2. Anodizing: After surface pretreatment of the profiles, under certain process conditions, anodization of the substrate surface occurs, resulting in a dense, porous, strong AL203 film layer.

3. Sealing: The pores of the porous oxide film formed after the anodization are closed, so that the oxide film can be prevented from pollution, corrosion and abrasion resistance. The oxide film is colorless and transparent. By using the strong adsorption of the oxide film before sealing, some metal salts can be adsorbed and deposited in the film pores, which can make the appearance of the material besides the colors (silver white), such as: black, bronze, Gold and stainless steel and so on.