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通过向Na2Si O3-Na Al O2复合电解液体系中添加纳米Si C,经过微弧氧化处理后在AZ91D镁合金表面制备含纳米SiC的复合陶瓷层。利用SEM、膜层测厚仪、XRD、EDS和维氏硬度计分别研究膜层的微观形貌、厚度、相结构、元素组成及硬度。采用摩擦磨损试验机对镁合金基体和膜层的干滑动磨损行为进行研究,运用动电位极化曲线试验和交流阻抗法测量镁合金基体和膜层在3.5%Na Cl溶液中的耐蚀性能。结果表明:向电解液中添加纳米Si C后,微弧氧化的起弧电压和终止电压均下降。经纳米SiC复合处理后,微弧氧化膜层的孔径减小,致密性提高;与未添加纳米Si C的膜层相比,其厚度和硬度都得到提升,耐磨性与耐蚀性均增强。
By adding nano-SiC into the Na2SiO3-NaAlO2 composite electrolyte system, a composite ceramic layer containing nano-SiC was prepared on the surface of AZ91D magnesium alloy after micro-arc oxidation treatment. The microstructure, thickness, phase structure, elemental composition and hardness of the films were investigated by SEM, film thickness gauge, XRD, EDS and Vickers hardness tester respectively. The friction and wear testing machine was used to study the dry sliding wear behavior of magnesium alloy substrate and film. The corrosion resistance of magnesium alloy substrate and film in 3.5% NaCl solution was measured by potentiodynamic polarization curve test and AC impedance method. The results show that the arc ignition voltage and the termination voltage of the microarc oxidation decrease after the nano-SiC is added into the electrolyte. After the nano-SiC composite treatment, the micro-arc oxide film pore size decreases, the density increased; compared with the film without nano-Si C, the thickness and hardness are improved, wear resistance and corrosion resistance are enhanced .