Aluminum and its aluminum alloys are easily corroded and oxidized in the atmosphere. Under normal circumstances, its products must undergo surface treatment to improve performance. The traditional method mainly uses chemical oxidation and direct current anodizing. The traditional method has many defects, such as rough surface, soft, low hardness, wear resistance, corrosion resistance and poor insulation and heat insulation. The oxide film structure of aluminum and its aluminum alloy products using pulse anodization has the advantages of uniformity and density, high purity, and low porosity.
At present, pulse anodic oxidation is the most promising anodic oxidation method in the aluminum alloy industry. The two most noteworthy issues in industrial development are: (1) the influence of anodizing parameters on the mechanical properties of various aluminum alloy coatings; (2) reducing the cost of anodizing equipment without reducing the coating performance. For better and faster industrial applications, researchers from Poland studied the influence of the bath temperature and current density of pulse anodization on mechanical strength.
Studies have shown that during the hard anodizing process of 5005 aluminum alloy with pulse current, increasing the bath temperature will not reduce the wear resistance and scratch resistance of the coating, which will help maintain the cost-effectiveness of the anodizing device.