After being treated by anodizing equipment, the sacrificial anode of aluminum alloy can make the surface of aluminum and its alloys obtain a fine film layer that is much thicker than the natural oxide film. This artificial oxide film is then closed, and the amorphous oxide film is transformed into a crystalline oxide film, and the pores are also closed, so that the metal surface gloss can be long-lasting, the corrosion resistance and mechanical strength are improved, and the decorative appearance can be obtained after dyeing. Because aluminum and its alloy products have many characteristics after anodizing, the aluminum anodizing process is widely used in the surface treatment of aluminum products. The application in industry can be roughly divided into the following two types:
1. Prevent product corrosion: Because the aluminum alloy sacrificial anodizing, the obtained film layer has been properly closed and has good stability in the atmosphere. Whether it is an oxide film obtained from sulfuric acid solution, oxalic acid solution or chromic acid solution in the normal process, its corrosion resistance is very good, such as daily aluminum pots, kettles, washing machine tanks, etc. The chromic acid oxidation method is also suitable for aluminum welded parts and riveted parts.
2. Protection - Decoration: On the oxide film with high transparency, the oxide film has the characteristic of being able to absorb a variety of * dyes or inorganic pigments. Various bright and beautiful colors and patterns can be obtained on the oxide film. In addition, many new processes have emerged in recent years, such as one-time oxidation and multiple coloring, fireworks patterns, wood grain patterns, oxidation offset printing, porcelain oxidation, etc. The aluminum alloy sacrificial anode makes the aluminum appearance more beautiful and pleasing to the eye. This colorful film is both a decoration layer and an anti-corrosion layer, such as lighters, gold pens and handicrafts.