Aluminum alloy materials are widely used in various fields because of their low relative density, weldability, easy forming and processing, and high mechanical strength, especially in the aviation industry. Aluminum has a relatively strong affinity with oxygen in the air. Even in dry air, it is very easy to react with oxygen, and a thin layer of non-porous amorphous Al2O3 is formed on the surface. However, due to the naturally occurring oxide film is relatively thin. , The wear resistance and corrosion resistance are poor, far from meeting the application requirements, and can not be used as a reliable protective layer. Therefore, in order to improve the corrosion resistance of aluminum alloys, aluminum alloys must be surface treated, and anodizing is the most commonly used surface treatment method for aluminum and aluminum alloys. Anodized aluminum films have good mechanical properties, corrosion resistance and friction resistance. At the same time, the surface of the membrane has strong adsorption.

In aviation, aluminum alloy is the main material of aircraft body structure. In the design of aircraft, the selection of structural materials should have high specific strength and specific stiffness to reduce the structural quality of the aircraft or increase economic benefits, and should also have good machinability. The skin, beams, ribs, stringers, bulkheads and landing gear on the aircraft can all be made of aluminum alloys.

In order to overcome the shortcomings of the surface properties of aluminum alloys, expand the scope of application and prolong the service life, surface treatment technology is an indispensable part of the use of aluminum alloys. Aluminum alloy anodic oxide film has good corrosion resistance, good organic coating adhesion, high hardness and wear resistance, and is also an insulating film with high resistance. Aluminum alloy anodizing technology can meet a variety of needs, so that the aluminum alloy surface can obtain many excellent qualities such as good corrosion resistance, good wear resistance, good decoration, good adhesion and good functionality. More in-depth and comprehensive surface treatment technology.

Aluminum Alloy Anodizing Technology

Anodizing of aluminum alloy is a dynamic equilibrium process of growth and dissolution of oxide film. During anodization, the growth rate of oxide film should be promoted as much as possible to be greater than the dissolution rate of surface film. Aluminum alloy anodizing technology can be divided into direct current anodizing, alternating current anodizing and pulse current anodizing according to the current form. According to the properties of the film layer, it can be divided into ordinary film, hard film, porcelain film, bright modification layer and barrier layer with semiconductor effect. According to the electrolyte, it can be divided into natural color anodizing with sulfuric acid, chromic acid, oxalic acid and mixed acid as the main components of the electrolyte.

Anodizing technology is an important surface treatment process in the production of aluminum alloy parts on aircraft. In recent years, with the development of modern industry, the improvement of people's living standards and the enhancement of environmental awareness Therefore, the requirements for aluminum alloy anodizing process are getting higher and higher, and the functional requirements are becoming more and more diverse. In the production practice, it is necessary to observe, analyze and summarize many factors that affect the performance of the anodic oxide film for a long time, and master the method to improve the performance of the anodic oxide film, so as to provide guarantee for obtaining satisfactory product quality.

Domestic aluminum alloy anodizing focuses on oxide film thickness, hardness and corrosion resistance. In addition to paying attention to the thickness, hardness and corrosion resistance of the oxide film, foreign countries are also actively developing a closed-loop recycling system for the process, moving towards a zero-emission clean process. Therefore, we need to actively carry out new process research on the basis of existing aluminum and aluminum alloy anodization research, improve film quality, reduce energy consumption, and reduce production costs, and strive to develop high-efficiency, energy-saving, simple process and environmentally friendly treatment. It can meet the needs of my country's aviation industry for anodized films with excellent performance and diversified functions.

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