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通过金相显微镜、扫描电镜、X射线衍射仪等设备分析了Sn对铸态Mg-2.7Nd-0.4Zn-0.5Zr合金显微组织和腐蚀性能的影响。结果表明,铸态Mg-2.7Nd-0.4Zn-0.5Zr-xSn(x=0.5、1.0、1.5、2.0)合金的组织是由α-Mg基体、Mg_(12)Nd相、点状或杆状的Mg_2Sn相组成。随着Sn含量的增加,Mg_2Sn相逐渐增多。铸态合金的腐蚀速率随着Sn含量的增加呈现先减小后增大的趋势,其中当Sn含量为1.0%时合金具有最佳的耐腐蚀性能。Sn的加入能够细化Mg_(12)Nd相,同时析出更稳定性的Mg_2Sn相,并在Sn含量为1.0%时分布较为均匀。
The influence of Sn on the microstructure and corrosion resistance of as-cast Mg-2.7Nd-0.4Zn-0.5Zr alloy was analyzed by means of metallographic microscope, scanning electron microscope and X-ray diffraction. The results show that the microstructure of as-cast Mg-2.7Nd-0.4Zn-0.5Zr-xSn (x = 0.5,1.0,1.5,2.0) alloy consists of α-Mg matrix, Mg 12 Nd phase, Mg_2Sn phase composition. With the increase of Sn content, Mg_2Sn phase increased gradually. The corrosion rate of as-cast alloy first decreases and then increases with the increase of Sn content, and the alloy has the best corrosion resistance when the Sn content is 1.0%. The addition of Sn can refine the Mg 12 Nd phase while precipitating a more stable Mg 2 Sn phase and distribute more uniformly when the Sn content is 1.0%.