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在硼酸盐和硅酸盐碱性电解液体系中分别对6063铝合金表面进行微弧氧化(MAO)处理,制备出微弧氧化膜,并借助扫描电子显微镜(SEM)和电化学测试等手段对膜层显微组织和耐蚀性进行研究。结果表明:与硼酸盐体系中的膜层相比,硅酸盐中的膜层更加致密。硅酸盐体系的膜层中存在较多Al9Si相。腐蚀行为研究结果表明,硅酸盐体系中的膜层能为铝合金提供较好的防护作用,而硼酸盐中的膜层呈多孔结构,表现出一般的耐蚀性。电化学阻抗谱测试表明:在0.5 mol/L NaCl溶液中,两种膜层都能起到较好的抗腐蚀作用,而在1 mol/L的NaCl溶液中浸泡72 h后,硼酸盐中的膜层则很难为基体提供足够的保护。
In the borate and silicate alkaline electrolyte system, the surface of 6063 aluminum alloy was treated by micro-arc oxidation (MAO) to prepare micro-arc oxidation film, and by means of scanning electron microscopy (SEM) and electrochemical tests The film microstructure and corrosion resistance were studied. The results show that the silicate film is denser than the film in the borate system. There are many Al9Si phases in the film of silicate system. Corrosion behavior of the results show that the silicate system of the film can provide good protection for the aluminum alloy, and borate film was porous structure, showing the general corrosion resistance. The results of electrochemical impedance spectroscopy showed that the corrosion resistance of both films was good in 0.5 mol / L NaCl solution. After soaking in 1 mol / L NaCl solution for 72 h, Of the film is difficult to provide adequate protection for the substrate.