Al2O3纳米粒子对镁合金阳极氧化的影响研究

摘要

通过在阳极氧化液中添加纳米A12 O3,在镁合金表面制备了复合阳极氧化膜.采用扫描电镜、能谱仪、动电位极化测试以及往复摩擦磨损实验研究了纳米Al2 O3的添加量对阳极氧化过程、形貌及氧化膜性能的影响.结果表明,纳米颗粒的加入,增大了溶液电阻,从而使得成膜电压提高.纳米粉末的添加量与复合氧化膜的性能没有线性相关性.当电解液纳米颗粒的浓度为10g/L时,可以获得表面光滑平整、孔径细小均匀的复合氧化膜,此时复合氧化膜具有最优的耐蚀性和耐磨性能.%Composite oxide films have been produced on AZ31 magnesium alloy by adding nano-Al2O3 particles to alkaline anodic oxidation solution.The effect of nano-Al2O3 particles on the process of anodizing,surface morphology and properties were analyzed by scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS),potentiodynamic polarization test and friction tests.The results show that the coating formation voltage increases with the addition of nano-Al2 O3 particles.The performances of composite oxide films have no linear correlation with the concentration of nano-Al2 O3 particles.The composite oxide film prepared in the presence of 10g/L nano-Al2O3 particles has uniform,smooth and compact surface morphology and shows best corrosion resistance and excellent wear resistance.