Because the oxide film obtained through anodization has been properly sealed, it has excellent stability in the atmosphere. Whether it is the oxide film obtained from sulfuric acid solution, oxalic acid solution or chromic acid solution under normal processes, its corrosion resistance is very good, such as in daily aluminum pots and washing machine inner containers. After the surface of aluminum profiles undergoes anodization, its corrosion resistance, hardness, wear resistance, insulation, heat resistance, etc. have been greatly improved. The outer layer of the aluminum anodized film is porous, which easily adsorbs dyes and colored substances, enabling coloring to enhance its decorative properties. After the oxide film is sealed with hot water, high-temperature steam or nickel salts, its corrosion resistance and wear resistance can be further improved. 

In sulfuric acid or oxalic acid solutions, by adjusting the process conditions of anodic oxidation, a thick and hard film layer can be obtained. The porosity and absorption properties of the film can be used to store the selected oil, which can be effectively applied under working conditions such as friction conditions. It also has the characteristics of lubrication and wear resistance, such as in the engine cylinders and pistons of cars and tractors. The oxide film of aluminum and its alloys has the characteristic of high resistance, and the thickness of the film is proportional to the resistance. This property has certain practical significance as an electrical insulator and can be used as a dielectric in capacitors. 
The oxide film, due to its porous structure and excellent adsorption capacity, has good adhesion with paint films and organic films, and can be used as the base layer of paint. The film obtained by anodic oxidation with phosphoric acid can be used as the base layer for electroplating on aluminum. The anodic oxide film has high wear resistance and good sunfastness. It will not fade even after being exposed to the atmosphere for more than 20 years. Anodic oxidation treatment can give the surface of aluminum and its alloys a layer that is much thicker than the natural oxide layer, which can maintain the luster of the metal surface for a long time, improve corrosion resistance and mechanical strength, and obtain a decorative appearance after dyeing. 
Because the oxide film obtained through anodization has sufficient stability in the atmosphere, the oxide film on the aluminum surface can be used as a protective layer. The oxide film obtained by anodization in aluminum chromic acid solution is dense and has good corrosion resistance. The pores of the oxide film obtained from sulfuric acid solution are larger than the former, but the film layer is thicker and has strong adsorption capacity. If the filling is done properly, its corrosion resistance is also very good. Especially, chromic acid anodization is particularly suitable for anodization of riveted and welded parts. 
For most aluminum and its alloy products that require surface polishing, after undergoing chemical or electrochemical polishing, anodic oxidation with sulfuric acid solution can result in an oxide film with high transparency. This oxide film can adsorb various organic and inorganic dyes, thus possessing various bright colors. This colored film serves both as a protective layer and a decorative layer. Under certain special processing conditions, a protective and decorative oxide film with an appearance similar to that of porcelain can also be obtained.