在含柠檬酸钠的碱性硅硼体系中对AZ91D镁合金进行电化学阳极氧化成膜处理，通过记录阳极氧化电压随时间的变化以及扫描电镜、能谱仪和电化学测试等方法考察了阴离子型表面活性剂十二烷基磺酸钠(SDS)对镁合金阳极氧化过程和氧化膜性能的影响。结果表明，在阳极氧化过程中，十二烷基磺酸根离子被吸附到镁合金电极表面，增加了表面膜层电阻，提高了阳极氧化电压，使得阳极氧化膜层更致密、厚度分布更均匀，减少了表面微气孔。当SDS含量为0.2~0.4 g/L时，所得阳极氧化膜具有最大的电荷传递电阻和膜电阻，对镁合金具有最好的腐蚀防护性能。
The electrochemical anodizing treatment of AZ91D magnesium alloy was carried out in an alkaline silicate–borate bath containing sodium citrate. The effect of sodium dodecyl sulfonate (SDS), an anionic surfactant, on the anodizing process of magnesium alloy and the properties of oxidation film was studied by recording the variation of anodizing voltage with time, scanning electron microscopy, energy disperse spectroscopy, and electrochemical measurements. The results indicated that dodecyl sulfonate ions are adsorbed on the surface of magnesium alloy anode during anodizing, increasing the resistance of the oxidation film and anodizing voltage, resulting in compacter anodized film and more uniform thickness distribution, while decreasing the micro-holes on film surface. The anodic oxidation film obtained with SDS 0.2-0.4 g/L has the greatest charge transfer resistance and film resistance, providing the best corrosion protection for magnesium alloy.
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