As a new surface treatment technology for magnesium and aluminum alloys, micro-arc oxidation has attracted great attention from related enterprises and scholars due to its high efficiency, energy saving, environmental protection and the special functions of the obtained ceramic layer. The micro-arc oxidation (also known as surface ceramic treatment) technology on the surface of aluminum and magnesium alloys jointly developed by our company and Xi'an University of Technology has entered the stage of industrialization and promotion. At present, more than 20 magnesium-aluminum alloy micro-arc oxidation treatment lines of different specifications have been developed for many domestic and foreign enterprises such as FAW Group, Foxconn Group, Chongqing Changan and Chongqing Magnesium Industry.

1. Principle and advantages of micro-arc oxidation

Micro-arc oxidation treatment is to use aluminum and magnesium alloy products as anodes and stainless steel as cathodes, and place them in an electrolyte in a pulsed electric field environment to generate micro-arc discharges on the surface of the products to form a layer of aluminum oxide or oxide that is metallurgically combined with the substrate. Magnesium ceramic layer. This technology can greatly improve the corrosion resistance of the surface of the parts, and also greatly improve the surface wear resistance. Magnesium alloy products processed by this process. Compared with the traditional chroming and phosphate treatment, its salt spray resistance level is improved by 2~3 levels; the treated aluminum products, such as sewing machine needle bars, spinning rotors and internal combustion engine parts, are different from traditional hard chrome plating and hard chrome plating. Compared with the anodizing and spraying Teflon process, its life is increased by 3~5 times, and the hardness after treatment is HV500-2500

2.the production process:

3. Process advantages

(1) The theoretical feasibility of cleaning treatment meets the environmental protection requirements of lightweight manufacturing. The main consumables for lightweight manufacturing are light metals such as aluminum and magnesium. Micro-arc oxidation treatment is not only different from consumable cathode treatment such as electro-galvanizing, non-consumable stainless steel can be used as cathode, which avoids the dissolution of heavy metal ions from the cathode and the outflow of waste water to pollute the environment; it is also different from electroplating hard chromium and heavy (or hard) Anodizing and other processes rely on the consumption of solute elements in the solution to form a protective film layer on the surface of the sample to be treated. Micro-arc oxidation treatment mainly forms a ceramic layer of metal oxides on the surface of light alloys such as aluminum and magnesium, which theoretically does not consume solutes. Element processing technology. Therefore, the process is referred to as a cleaning process that consumes neither the cathode nor the electrolyte solute elements.

(2) The ceramic properties of the product meet the surface performance requirements of lightweight manufacturing. Aluminum and magnesium alloys need to be given different surface properties due to different use environments. The aluminum and magnesium alloys treated by micro-arc oxidation have a ceramic layer mainly composed of aluminum oxide or magnesium oxide that is metallurgically combined with the substrate on the surface. High temperature corrosion resistance, connection (galvanic) corrosion, abrasion corrosion and aluminum alloy anti-seawater corrosion, high temperature thermal corrosion and improved wear resistance and other performance requirements.

4. Model and production capacity of micro-arc oxidation equipment

5.production demonstration:

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