The Characteristics of the Aluminum Alloy Housing

The advantages of aluminum alloy housings are small proportion, good machinability, excellent electrical performance, strong conductivity and so on. However, the oxide film formed by aluminum alloy itself can not withstand the corrosion of the application environment, so it is necessary to develop a more reasonable surface treatment method to improve its corrosion resistance.

Aluminum alloy performance is very active, easy to form oxide film on its surface, under normal conditions difficult to chemical plating on its surface. Generally, nickel plating on aluminum alloy surface, and then other elements, chemical nickel plating process is used in the most extensive two methods: zinc immersion - pre-plating method and direct chemical nickel plating.

The disadvantage of the zinc immersion-pre-plating method is that the nickel layer is easily peeled off in a humid corrosive environment, and there is a nitric acid dezincification procedure between the two dips, which will pollute the production environment, so the development of the process is subject to certain constraints.

Chemical plating is a new type of metal surface technology, simple technology, energy saving and environmental protection, a wide range of use, uniform coating. In terms of protective performance, it can improve the corrosion resistance and service life of the product, and in terms of functionality, it can improve the wear lubricity of the processing parts and other functions, thus becoming the development trend of surface treatment technology.

Thermal spraying technology can be sprayed with a variety of metal alloys and non-metallic and other solid-state materials, so it can be made with a variety of performance of functional coatings, and flexible construction, adaptability. Thermal spraying is a more mature and effective surface treatment method. The advantages of thermal spraying process are: light equipment, flexible process, less operating process, short processing time, fast repair, coating thickness can be controlled.

Aluminum alloy corrosion resistance is not strong, easy to stain stains. Therefore, aluminum alloy housings usually have to carry out special oxidation treatment, so as to obtain good performance with corrosion resistance, wear resistance and other shell parts.

The anode oxidation anode is made of aluminum alloy products in the electrolyte, the cathode is made of aluminum plate, and the after effect is powered on. The process by which an oxidizing film is generated on the surface of the product after powering up. After anode oxidation, the aluminum alloy surface can produce a thickness of several microns to several hundred microns of oxide film.

Chemical oxidation method, through chemical reactions on the surface to create a good adsorption of porous oxide film, can be used as the bottom layer of organic coating. Chemical oxidation method is characterized by: easy to operate, simple equipment, low cost, high efficiency, used in aluminum alloy housings and aluminum alloy products not suitable for electrochemical treatment parts.

Microarc oxidation is a new type of aluminum alloy surface ceramicization technology developed on the basis of anode oxidation. The technology uses high-energy density micro-plasma arc, the film layer and hardness formed after oxidation have been greatly improved, and the process is simple, high production efficiency, low pollution, strong processing capacity, is a promising new surface treatment technology.

Laser surface cladding technology is a surface reinforcement method for rapid heating and melting of alloy or ceramic powders and substate surfaces under the action of high-energy beams, which are naturally cooled after the beam is removed. The advantage of the method is high economic efficiency, which can reduce cost efficiency and save materials.

Surface anti-corrosion treatment shell greatly improves the performance of aluminum alloy housing parts, in order to further meet the requirements of anti-corrosion, surface painting is required. With the higher and higher environmental requirements, people's awareness of environmental protection is increasing, for surface anti-corrosion coatings towards non-polluting or low-pollution direction. With the development of various aluminum alloy products manufacturing process, coatings with anti-corrosion function play an increasingly important role in saving, environmental protection, anti-corrosion and so on.

With the increasing application scope and application quantity of aluminum alloy housing parts, the surface corrosion protection of aluminum alloy housing has been paid more and more attention by various industries, and the research and development and improvement of aluminum alloy surface corrosion protection technology has become the focus of aluminum alloy housing processing industry.