News

Secrets of aluminum anodizing

Release time:

2021-09-27 09:20

Anodizing is an electrolytic oxidation in which the surface of the aluminum alloy is usually converted into an oxide film, which has protective, decorative and other functions.

Characteristics of anodic oxide film

A. oxide membrane structure isporous honeycomb knotThe porosity of the film makes it have a good adsorption capacity, and can be used as the bottom layer of the coating layer can also be dyed to improve the decorative effect of the metal.

B. Oxide filmHigh hardness, The hardness of the anodic oxide film is very high, its hardness is about 196-490HV, because the high hardness determines the wear resistance of the oxide film is very good.

C. oxide filmCorrosion resistanceThe aluminum oxide film is very stable in the air and soil, and the bonding force with the matrix is also very strong. Under normal circumstances, the oxidation will be dyed and sealed or sprayed to further enhance its corrosion resistance.

d. oxide filmbinding forceThe bonding force of the oxide film to the base metal is very strong, and it is difficult to separate them mechanically. Even if the film layer bends with the metal, the film layer still maintains good bonding with the base metal. However, the plasticity of the oxide film is small and the brittleness is large. When the film layer is subjected to large impact load and bending deformation, it will crack, so this oxide film is not easy to use under mechanical action and can be used as the bottom layer of the paint layer.

e. oxide filmInsulationThe anodic oxide film of aluminum has high impedance, low thermal conductivity, and thermal stability as high as 1500 degrees. It can be used as the dielectric layer of electrolytic capacitors or the insulating layer of electrical products.