以AZ92镁合金为研究对象,添加少量稀土Sm(0 ～ 1.1％),利用扫描电子显微镜、X射线能谱分析法、静态腐蚀失重法和电化学测试等方法研究了少量稀土Sm对AZ92镁合金微观组织、腐蚀速率影响,并探讨了稀土Sm对AZ92镁合金耐腐蚀性能的影响机制.结果表明:随着合金中Sm含量的增加,AZ92合金中粗大枝状β-Mg17Al12组织枝晶断裂,逐渐转变为小岛状,体积分数下降,同时Sm原子结合Al,Mn原子转变成颗粒状Al-Mn-Sm相和Al-Sm相；通过静态腐蚀失重和电化学实验可知AZ92-xSm合金抗腐蚀性能优于AZ92合金.在3.5％ NaCl水溶液中,Sm含量达到0.5％时,镁合金腐蚀速率趋于最小值,仅为AZ92合金的42％左右,抗腐蚀性能明显提高.
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