At present, driven by the growing industrial demand, composite coating technology will gradually replace single coating technology. Micro-arc oxidation is also called micro-plasma oxidation. This technology can prepare ceramic layers with good metallurgical properties on the surface of light metals Al, Mg, Ti and corresponding alloys with the help of high voltage, high current and instantaneous high temperature. The main component of the ceramic layer is the oxide grown in situ on the substrate, and the electrolyte components will also participate in the micro-arc oxidation film layer. The electrical parameters in the micro-arc oxidation process (such as solution formulation, voltage and current, duty cycle, pulse frequency, etc.) have a great influence on the preparation and microstructure of the micro-arc oxidation film. This method has the advantages of safe process, simple operation, and environment-friendly solution. It also has the advantages of simple process, uniform and dense film layer, and less restrictions on the size of workpieces, which cannot be compared with other treatment technologies.
ASTM F136 6Al-4V ELI Titanium Bar alloy micro-arc oxidation film has the advantages of high hardness, high bonding strength of film base, corrosion resistance and wear resistance, but the surface of the film layer is rough, loose and porous, and the friction coefficient is large, which reduces the wear resistance of the film layer. , which shortens the service life of the oxide film, which is not conducive to the application of titanium alloys in abrasive environments. At present, some research institutes of the Russian Academy of Sciences have carried out a lot of work to improve the defect of titanium alloy micro-arc oxidation film, but domestic attention to this issue has just started.
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