Characteristics of anodizing process in aluminum alloy shell processing

by:Zeyi     2021-06-20
As we all know, the current aluminum alloy casing is widely used in both life and industrial products. However, in order to adapt the aluminum alloy casing to a certain environment or achieve certain functions, companies have also selected different processes accordingly. Aluminum shell surface, such as: anodizing, electroplating, spraying, micro-arc oxidation treatment, etc. Among them, the anodizing process is currently a process that is widely used in the processing of aluminum alloy shells. What are the characteristics of the anodizing process in the processing of aluminum alloy shells? Anodizing refers to aluminum and its alloys in the corresponding electrolyte and specific The process of forming a layer of oxide film on the aluminum product (anode) due to the action of the applied current under the process conditions. If there is no special indication, anodic oxidation usually refers to sulfuric acid anodic oxidation. In order to overcome the defects of aluminum alloy surface hardness and wear resistance, expand the scope of application, and extend the service life, surface treatment technology has become an indispensable part of the use of aluminum alloy, and anodizing technology is widely used and very successful A craft. After the aluminum alloy shell is anodized, it will produce a layer of anti-corrosion, wear-resistant and beautiful oxide film on the surface. The characteristics of the oxide film also establish the position of anodization in the surface treatment process. The aluminum alloy shell has been anodized and put on a protective 'coat'. Because the chemical properties of the anodized film are very stable in the natural environment, it can provide corrosion protection for the aluminum alloy shell. At the same time, the anodic oxide film has high hardness and low roughness. The surface is smooth, which greatly improves the wear resistance of the aluminum shell. If various organic and inorganic dyes are added during the anodization process, the anodic oxide film will have color. , Which brings a beautiful appearance to the aluminum shell. The content introduced above is the characteristics of the anodizing process in the processing of aluminum alloy shells. 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 due to the existence of certain defects and impurities on the surface of the aluminum alloy die-casting parts during anodizing. The current of anodizing is unevenly distributed on the surface of the product. In some places, the current is low, and in some places the current is high. The flow speed of the electrolyte in the recesses will slow down, and the flow speed at the tip will be faster. The effect of anodizing is uneven, and black stripes will appear on the surface of the aluminum alloy shell, so the aluminum alloy shell must be polished clean when polishing.
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