Low temperature oxidation is generally used for hard oxidation and hard oxidation.
1: The color film layer is gray, brown, dark green to black, which is related to the material composition and process, and the lower the temperature, the thicker the film is.
Note: gradually darker from light yellow (1.5 silk pale yellow)
2: The hardness of the oxide film is extremely high. On pure aluminum, HV=1200-1500, the hardness on the alloy aluminum 7075 is significantly lowered. HV=400-800. Since the micropores can adsorb the lubricant, the wear resistance can be greatly improved. 1.5 wire HV=350-400
3: The thickness of the film can reach up to 250 microns, so it is also called thick film oxidation.
4: Corrosion has extremely high corrosion resistance, especially in industrial and marine climates.
5: Insulation and adiabatic hard film resistance is large, the film layer is 100 micron, can withstand 2000 volts or more, the melting point is 2050 degrees Celsius, and the thermal conductivity is as low as 67 KW/(M.K), which is an excellent heat-resistant material.
6: The binding force is very strong in combination with the body.
Due to the nature of machining aluminum hard anodization, it is widely used. Mainly used for aluminum parts with high heat resistance, wear resistance and high insulation performance, such as pistons, cylinders, bearings, impellers for hydropower equipment, etc.