There are many anodic oxidations for aluminum alloys, which can be used in daily life. Because of the characteristics of this process, the surface of aluminum parts produces a hard protective layer, which can be used to produce kitchenware and other daily necessities. However, the anodizing effect of cast aluminum is not good, the surface is not good, and it can only be black. The aluminum alloy profile should be better. Let me briefly introduce the method of aluminum plate oxidation treatment.
In the past ten years, my country's aluminum oxide coloring process technology has developed rapidly. Many factories have adopted new process technologies and have accumulated rich experience in actual production. There are many mature and developing processes for anodizing aluminum and its alloys, and suitable processes can be selected according to actual production needs.
Before choosing the oxidation process, you should understand the material of aluminum or aluminum alloy. Because the quality of the material and the difference in the composition will directly affect the quality of aluminum products after anodizing.
For example, if there are bubbles, scratches, peeling, roughness and other defects on the aluminum surface, all the defects will still be revealed after anodizing. The alloy composition also has a direct impact on the surface appearance after anodic oxidation.
For example, an aluminum alloy containing 1 to 2% manganese becomes brownish-blue after oxidation. As the manganese content in the aluminum material increases, the surface color after oxidation changes from brownish-blue to dark brown.
Aluminum alloy with 0.6 to 1.5% silicon content is gray after oxidation, and white gray when silicon content is 3 to 6%.
Zinc-containing products are opalescent, chromium-containing products are golden to gray with uneven tones, and nickel-containing products are light yellow.
Generally speaking, only aluminum containing magnesium and titanium containing more than 5% contains gold, and after oxidation, a colorless, transparent, bright and clean appearance can be obtained.
After choosing aluminum and aluminum alloy materials, it is natural to consider choosing a suitable anodizing process. At present, the sulfuric acid oxidation method, oxalic acid oxidation method and chromic acid oxidation method widely used in our country have been introduced in detail in manuals and books, so there is no need to repeat them.