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利用二次微弧氧化法在AZ40M镁合金表面成功制备了黑色的氧化膜层,通过SEM、EDS和XRD表征了膜层的微观形貌和成分组成。结果表明,柠檬酸铁添加剂浓度可显著影响镁合金表面氧化膜的形貌、组成和厚度,添加剂浓度越高,膜层中的铁氧化物含量也越高,而对膜层厚度的影响则没有呈现出明显规律。同时,测试了0.1 mol/L Na Cl溶液中的电化学阻抗谱和动电位极化曲线,结果显示镁合金表面黑色膜层具有较好的耐蚀性,且膜层越厚,铁含量越少,膜层的耐蚀性越好。
Black oxide film was successfully prepared on the surface of AZ40M magnesium alloy by secondary micro-arc oxidation method. The microstructure and composition of the film were characterized by SEM, EDS and XRD. The results show that the ferric citrate additive concentration can significantly affect the morphology, composition and thickness of the oxide film on the surface of the magnesium alloy. The higher the concentration of the additive, the higher the content of iron oxide in the film, but not the thickness of the film Showing a clear law. At the same time, the electrochemical impedance spectroscopy and the potentiodynamic polarization curve of 0.1 mol / L NaCl solution were tested. The results showed that the black film on the surface of magnesium alloy had good corrosion resistance. The thicker the film, the less the iron content , The corrosion resistance of the film is better.