Anodizing and galvanizing of aluminum surface

With the increasing use of aluminum materials, the processes such as melting and casting, extrusion, mould and surface treatment have also developed unprecedentedly. Of course, the surface treatment with rapid technological progress is the most important. Whether it is the process diversity, technical level, product quality or equipment level of surface treatment, it has developed into a new stage.

Dalian surface oxidation galvanizing process uses compound solution or solvent to pretreat the aluminum surface, which is often used. Generally speaking, it is also an economic aluminum surface pretreatment process. Chemical pretreatment can effectively remove the grease, pollutants and natural oxide film on the original aluminum surface, so as to make the aluminum material obtain a wet and uniform clean surface.

Anodizing can not only solve the shortcomings of aluminum surface hardness and wear resistance, but also prolong the service life of aluminum and enhance the beauty. It has become an indispensable part of aluminum surface treatment. It is a widely used and very successful process at present.

Oxidation treatment mainly includes anodic oxidation, chemical oxidation and micro arc oxidation. The surface morphology, oxide thickness, friction resistance and corrosion resistance of aluminum alloy after three surface treatments were analyzed and compared in detail. The results show that after different surface treatments, the aluminum alloy surface can form oxide films with different thickness, the surface hardness and friction resistance are significantly increased, and the corrosion resistance of the alloy is also improved in varying degrees. In terms of overall performance, micro arc oxidation is better than anodic oxidation, and anodic oxidation is much better than chemical oxidation.

There are a large number of micropores (diameter 0.01 ~ 0.05) on the surface of the oxide film μ m； each μ M 2 (60 ~ 800 micropores). If aluminum coated with oxide film is put into a pressure vessel, pressurized by steam blowing or put into boiling water to form aluminum hydroxide in the surface area of its micropores, the micropores are closed and the surface is smooth. This treatment is called sealing. In this treatment, the micropores can be colored by allowing the dye to penetrate into the micropores.

Aluminum oxidation treatment of materials can effectively improve corrosion resistance and enhance durability. Aluminum oxidation is widely used in external and architectural applications between buildings all over the world, or when some aluminum is exposed to harsh environment.