ã€China Aluminum Network】We all know that aluminum is widely used in life and industry, and aluminum is also a variety of surface treatment methods, usually anodizing, chemical conversion, micro-arc oxidation, electroplating, electroless plating or Surface organic coating (spraying or painting) and so on. The more widely used process is the anodizing process, so why is the anodizing "better"?
The anodizing process of aluminum and aluminum alloys has a wide range of applications in the industry, and can be used to prevent the corrosion of products or to achieve the dual purposes of protection-decoration, such as wear-resistant layers, electrical insulation layers, lacquer underlays, and electroplated underlayers.
1. Prevention of corrosion of aluminum products Since the film obtained by anodization itself has sufficient stability in the atmosphere, it is possible to use an oxide film on the aluminum surface as a protective layer. The anodic oxidation of aluminum in chromic acid solution gives dense oxide film and good corrosion resistance; the oxide film obtained from sulfuric acid solution has larger pores than the former, but its film layer is thick and its adsorption ability is very strong. Appropriate filling and sealing treatment also has good corrosion resistance. In particular, chromic acid anodizing is particularly suitable for anodizing of riveted joints and weldments.
2. Protective-decorative products For most aluminum and its alloy products requiring surface finishing, after chemical or electrochemical polishing, anodizing with a sulfuric acid solution can result in a more transparent oxide film. This oxide film can adsorb a wide variety of organic dyes and inorganic dyes, thus having a variety of bright colors. This color film is both an anti-corrosion layer and a decorative layer. Under certain special processing conditions, protective oxide films with similar appearance and porcelain can also be obtained.
3. As a hard wear layer By hard anodizing aluminum and aluminum alloys, a thick and hard Al2O3 film layer can be obtained on the surface. This film not only has a higher hardness and thickness, but also has a low roughness. In the sulfuric acid or oxalic acid solution, a hard and thick oxide film can also be obtained on the aluminum product by anodization.
The porous thick oxide film is capable of storing lubricating oil, so it can be effectively applied to aluminum products that work in a friction state. For example, engine cylinders and pistons of automobiles and tractors can be greatly anodized to increase their wear resistance.
4. As an insulating layer of electricity, the oxide film obtained after anodization of aluminum and aluminum alloy products has a relatively large resistance, so it has a certain role in improving the electrical insulation of some products, and it can be used to prepare capacitors by anodizing. The dielectric layer can also be made of aluminum oxide for the surface of the insulating layer.
5. As the bottom layer of spray paint due to the porosity of the anodized film and good adsorption capacity, it can be used as the bottom layer of spray paint and other organic films, so that the paint film and organic film are firmly combined with the product, thereby increasing its corrosion resistance. .
6. Before electroplating the underlying aluminum and aluminum alloy products as electroplated, it must be applied to the underlying layer before electroplating. There are many methods for applying the underlayer to the substrate surface. In addition to electroplating zinc, zinc immersion, and electroless nickel plating, anodization is also one of important methods.
I believe that through the above six points, everyone should understand the reason why the anodizing process is widely used. Anodizing is not only widely used in the industry, but also in the field of science and technology. Many innovative electronic devices are applied to anodizing. It is believed that in the future, the anodized aluminum alloy process will be applied to more fields.
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