What are the characteristics of the anodizing process in the processing of aluminum alloy shells?

Nowadays, aluminum alloy shells are widely used in both life and industrial products. We can see aluminum alloy shell products everywhere, and the popularity of aluminum alloy shells is increasing day by day. We can adapt aluminum alloy shells to a certain environment or achieve certain functions. Enterprises also choose different processes to treat the surface of the aluminum shell, such as anodizing, electroplating, spraying, micro-arc oxidation, and so on. Among them, anodizing is a process that is widely used in the processing of aluminum alloy shells. It can form an anodizing mold with a certain thickness, strength, and aesthetics on the surface of the aluminum alloy shell. What are the characteristics of the addition of anodizing process in the processing of aluminum alloy shells?

Anodizing refers to the process in which aluminum and its alloys form an oxide film on aluminum products (anode) under the action of an applied current under the corresponding electrolyte and specific process conditions. Anodizing usually refers to sulfuric acid anodizing unless otherwise specified. In order to overcome the defects of surface hardness and wear resistance of aluminum alloys, expand the application and prolong the service life, surface treatment technology has become an indispensable part of the use of aluminum alloys. We widely used anodizing technology and were very successful.

After the aluminum alloy shell is anodized, a layer of anti-corrosion, wear-resistant, and beautiful oxide film will be formed on the surface. The characteristics of the oxide film also establish the position of anodization in the surface treatment process. They anodized the aluminum alloy shell with a protective "coat". Because the chemical properties of the anodized film are very stable in the natural environment, it can provide anti-corrosion protection for the aluminum alloy shell. The anodized film has high hardness, low roughness, and a smooth surface, which improves the wear resistance of the aluminum shell. If we added various organic and inorganic dyes during the anodization process, the anodized film has a color, which gives the aluminum causing a beautiful appearance.

The anodizing process is very beneficial to the aluminum alloy shell, but when doing this process, some directional silver and black streamlined stripes are often formed on the surface of the aluminum alloy shell. These streaks are because of certain defects and impurities on the surface of the aluminum alloy die-casting parts when they are anodized. It unevenly distributed the current of anodizing on the surface of the product. In some places, the current is low, and in some places the current is high. It will slow the flow speed of the electrolyte in the depression down, and the flow speed at the tip will be faster. The effect of anodizing is uneven, and black stripes appear on the surface of the aluminum alloy casing, so the aluminum alloy casing must be very careful when polishing.

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