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通过静态失重法、扫描电子显微镜及能谱分析、X射线衍射、电化学测试法等测试手段对添加不同含量(0~0.8%)稀土元素Nd的AZ80镁合金的铸态组织和耐蚀性能进行研究。结果表明:适量稀土Nd的加入细化了合金中的β-Mg17Al12相,并且其组织由连续网状分布变为断续状、均匀分布。稀土Nd与合金中Al结合形成颗粒状或块状的稀土相Al3Nd。本实验条件下,添加0.2%Nd提高了合金的腐蚀电位,降低了腐蚀电流密度,显著降低合金的腐蚀速率,使合金的耐腐蚀性能得到显著提高。
The as-cast microstructure and corrosion resistance of AZ80 magnesium alloy with different contents of Nd (0-0.8%) were investigated by static weight loss method, scanning electron microscopy and energy dispersive spectroscopy, X-ray diffraction and electrochemical measurements the study. The results show that the proper amount of rare earth Nd is added to refine the β-Mg17Al12 phase in the alloy, and its structure changes from continuous network to intermittent and uniform distribution. The rare earth Nd combines with Al in the alloy to form a granular or massive rare earth phase Al3Nd. Under the experimental conditions, the addition of 0.2% Nd increases the corrosion potential of the alloy, decreases the corrosion current density, significantly reduces the corrosion rate of the alloy, and significantly improves the corrosion resistance of the alloy.