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通过光学显微镜,配备能量色散谱仪的扫描电子显微镜,X射线衍射仪,浸泡法和电化学测试的方法研究了Mn的添加对挤压Mg-Zn-Y-Nd合金在3.5％(质量分数)NaCl溶液中的微观组织和腐蚀行为的影响.结果表明,在研究的Mg-Zn-Y-Nd合金中添加Mn可以诱导Mg3Y2Zn3(I相)沉淀,可以抑制热挤压过程中动态再结晶(DRX)晶粒的粗化.同时,添加了Mn也可以提高合金的耐腐蚀性.不含Mn的Mg-5.6Zn-lY-0.4Nd合金与含锰1.0％的Mg-5.6Zn-lY-0.4Nd合金腐蚀速率分别为18.78和9.89 mm-a-1.而耐腐蚀性的提高主要归因于腐蚀产物层保护性的增强.“,”Effect of Mn addition on the microstructure and corrosion behavior of extruded Mg-Zn-Y-Nd alloy immersed in 3.5 wt％NaCl solution was studied by optical microscope,scanning electron microscope equipped with energy dispersive spectroscope,X-ray diffraction,immersion,and electrochemical measurements.Results suggest that the Mn addition in the studied Mg-Zn-Y-Nd alloy can induce Mg3Y2Zn3(I-phase)precipitation which may inhibit dynamic recrystallizaiton(DRX)grain coarsening during hot extrusion.Meanwhile,its corrosion resistance is improved by the addition of Mn.The corrosion rates of free and 1.0 wt％Mn containing Mg-5.6Zn-lY-0.4Nd alloys are 18.78 and 9.89 mm-a-1,respectively.The improvement of corrosion resistance is mainly due to an enhanced protectiveness of the corrosion product layer.