How is the aluminum profile painted?
The use of aluminum profiles is becoming more and more extensive. In use, we will have many methods for surface treatment of aluminum profiles, and coloring is one of them. So how to color the aluminum profile?
First of all, the aluminum profile should be oxidized. The extruded aluminum alloy profile has poor surface corrosion resistance, so it must be treated by anodizing to increase the corrosion resistance, wear resistance and appearance of the aluminum profile.
Then the specific steps are as follows:
1. Surface pretreatment: Use chemical or physical methods to clean the surface of the profile to expose the pure substrate, so as to obtain a complete and dense artificial oxide film. Mirror or matt (matt) surfaces can also be obtained by mechanical means.
2. Anodic oxidation: After surface pretreatment, under certain process conditions, anodic oxidation occurs on the surface of the substrate to form a layer of dense, porous, and strong adsorption AL203 film.
3. Pore sealing: the film pores of the porous oxide film formed after anodic oxidation are sealed, so that the anti-pollution, corrosion resistance and wear resistance of the oxide film are enhanced. The oxide film is colorless and transparent. Using the strong adsorption of the oxide film before sealing, some metal salts are adsorbed and deposited in the film pores, which can make the surface of the profile appear many colors other than the original color (silver white), such as: black, bronze, Golden yellow and stainless steel color, etc.