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通过ICP-AES、SEM、EDS分析、光学显微镜观察、电化学测试及腐蚀质量损失测定等方法研究了稀土Er改性铸造AM50镁合金经热挤压加工后的组织及耐蚀性能。结果表明,添加稀土Er后,组织中出现Al_3Er和Al_7ErMn_5两个新相,减少了β-Mg_(17)Al_(12)相的数量,从而提高了AM50镁合金的耐蚀性能。腐蚀试验表明,热挤压加工的Er改性AM50镁合金表面腐蚀坑数量较多,但是蚀坑较浅,主要是由于热挤压加工导致了α-Mg的数量的增加。
The microstructure and corrosion resistance of rare earth Er modified cast AM50 magnesium alloy after hot extrusion were studied by means of ICP-AES, SEM, EDS, optical microscope observation, electrochemical test and corrosion mass loss measurement. The results show that after addition of rare earth Er, two new phases of Al_3Er and Al_7ErMn_5 appear in the microstructure, which decrease the amount of β-Mg_ (17) Al_ (12) phase and improve the corrosion resistance of AM50 magnesium alloy. Corrosion tests showed that the number of corrosion pits on the surface of Er-modified AM50 magnesium alloy produced by hot extrusion was large, but the corrosion pits were shallow, mainly due to the increase of the amount of α-Mg due to hot extrusion.