[China Aluminum Industry Network] The oxidation treatment of aluminum and its alloys is divided into two major categories of chemical oxidation and electrochemical oxidation (commonly known as anodic oxidation). For the purpose of decoration, coloring treatment is often required. The coloring method is divided into chemical coloring and electrolytic coloring.
The film obtained by chemical oxidation treatment is relatively thin, generally 0.5μm to 4μm in thickness, soft and non-abrasive, and its anti-corrosion ability is lower than that of anodized film. Generally, it is not suitable to be used alone. Due to the better adsorption capacity of the chemical oxide film, it mainly functions as the bottom layer of the paint.
Anodized oxide film thickness of about 5 - 20 microns (hard anodized film thickness of 60 - 200 microns), has a higher hardness, good heat and insulation, corrosion resistance than chemical oxide film Porous, with good adsorption capacity.
The chemical oxidation treatment requires simple equipment, convenient operation, high production efficiency and low cost, and has a wide range of applications. It is not limited by the size and shape of parts and can oxidize large parts and assemblies (such as spot weldments, rivets, and slender tubes). Wait). After chemical oxidation coating, can effectively improve the corrosion resistance of parts.
Aluminum anodic oxide film is superior to chemical oxide film in comprehensive performance and is widely used. The main applications are:
(1) Protective. Improve wear resistance, corrosion resistance and weather resistance of parts.
(2) decorative. Made of a natural glossy film as a color film.
(3) Insulation. As a capacitor dielectric film, aluminum coil insulation film can withstand 25V per micron thickness.
(4) improve the binding force with the organic coating, for the coating bottom layer.
(5) To improve the binding force with the inorganic coating, as the bottom layer of electroplating, enamel.
(6) Other functional uses in development. Magnetic alloys are deposited in porous membranes as memory elements, solar absorbers, superhard films, dry lubricating films, and catalyst films.
Therefore, the oxidation treatment of aluminum and its alloys has been widely used in the construction, aerospace and aerospace industries, electrical and electronics industries, food industry, chemical and pharmaceutical industries, transportation and other fields. At the same time, with the development of these industries, their requirements for anodizing are also increasing.
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