The light metal micro-arc oxidation surface treatment technology is a kind of direct in-situ growth of a ceramic film on the metal surface, which plays a role of protection and wear resistance. The core principle of this technology is to place Ti, Al, Mg and other light metals and their alloys in an aqueous electrolyte as anodes. Using electrochemical principles, under the combined action of thermochemistry, plasma chemistry and electrochemical processes, through control Current density and other technical process parameters, spark discharge is generated on the surface of the material, and the spark discharge phenomenon is used to generate micro-arc oxidation spots on the surface of the material to form a dense oxide ceramic layer, thereby improving the surface quality of light metal parts such as titanium and titanium alloys. A kind of surface modification technology.
The wear resistance, corrosion resistance and insulation performance of the surface of light metal products such as titanium, aluminum, magnesium, etc. treated by the micro-arc oxidation process are greatly improved. In addition, the surface treatment process technology has no emissions of three wastes, no pollution to the environment, short process flow, simple operation, good energy conservation and economy. This process can replace the traditional surface treatment methods such as chromium-nickel electroplating and anodic oxidation that have serious pollution.
The micro-arc oxidation ceramic layer on the surface of light metal formed by the micro-arc oxidation process technology is combined with the substrate in the form of metallurgical micro-melting to form a denser protective film on the surface of the part product. This micro-melting metallurgical structure surface protective film greatly enhances the corrosion resistance of the substrate and improves the hardness and wear resistance of the product surface. After the micro-arc oxidation treatment, the formed micro-oxidized ceramic layer is not only firmly combined with the substrate in metallurgical micro-melt type, but also has a large number of blind hole micro-domain layers on the surface, and the distribution is uniform, and the specific surface area is large, which is conducive to anti-friction conditions The formation of a continuous oil film of the parts improves the lubrication conditions of the parts, reduces the friction coefficient and prolongs the service life. On the other hand, for products that require a special anti-corrosion protective coating treatment on the surface, this process can be used as a preliminary surface treatment, and the formed micro-arc oxidation surface is conducive to subsequent surface treatments such as sealing or powder spraying, and improves the bonding strength of the protective coating And firmness, thereby improving the quality of surface treatment.
Metal surface micro-arc oxidation treatment technology can be widely used in aerospace, aviation, weapons, machinery, automobiles, transportation, petrochemical, textile, printing, hood, electronics, light industry, medical and other industries. Titanium, aluminum, magnesium and their alloys Anti-corrosion and wear-resistant treatment on the surface of parts products. This process technology has been industrialized, and can mass-produce and process various shapes of titanium, aluminum, magnesium and their alloy products to meet the high requirements of users for product surface quality.
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