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采用扫描电子显微镜,X射线能谱,Tafel极化曲线和电化学阻抗谱法研究了铈镧转化膜对AZ63镁合金耐蚀性能的影响。结果表明,铈和镧的复合转化膜比单一稀土膜的表面更加均匀致密,对镁合金的耐蚀性有明显改善。双稀土转化膜的缓蚀效果随着浸泡成膜时间的增长而增加。延长时效时间有助于铈和镧的进一步氧化,耐蚀性能先增后减,时效48 h膜层的耐蚀效果最好。
The effects of cerium-lanthanum conversion coating on corrosion resistance of AZ63 magnesium alloy were investigated by scanning electron microscopy, X-ray energy dispersive spectroscopy, Tafel polarization curve and electrochemical impedance spectroscopy. The results show that the composite conversion film of cerium and lanthanum is more uniform and compact than the surface of single rare earth film, and the corrosion resistance of magnesium alloy is obviously improved. The corrosion inhibition effect of double rare earth conversion coating increases with the immersion time. Prolonging the aging time contributes to the further oxidation of cerium and lanthanum, and the corrosion resistance increases first and then decreases, and the corrosion resistance of the film after 48 h aging is the best.