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采用重力铸造工艺制备了Mg-4Zn二元镁合金及不同Nd元素含量的Mg-4Zn-xNd(x=1,2,3)三元镁合金。对铸态合金先后在420℃(24 h)、510℃(4 h)工艺条件下进行固溶处理。通过显微组织观察、动电位极化测试、浸渍试验和体外细胞试验研究了Nd含量及固溶处理工艺对Mg-4Zn-xNd(x=0,1,2,3)合金的耐腐蚀性能及细胞相容性的影响。结果表明:稀土元素Nd的添加使合金晶粒尺寸减小,以及三元合金腐蚀速率降低;铸态合金经固溶处理后,基体中第二相含量明显降低,该三元合金的腐蚀速率降低;当Nd含量达到2 wt%时,Mg-4Zn-2Nd合金的耐腐蚀性及细胞相容性最好。
Mg-4Zn-xNd (x = 1, 2, 3) ternary magnesium alloy with Mg-4Zn binary magnesium alloy and different Nd contents were prepared by gravity casting process. The as-cast alloy was solution treated at 420 ℃ (24 h) and then at 510 ℃ (4 h). The effects of Nd content and solution treatment on the corrosion resistance of Mg-4Zn-xNd (x = 0, 1, 2, 3) alloys were investigated by microstructure observation, potentiodynamic polarization test, immersion test and in vitro cell tests. Cell compatibility. The results show that the addition of rare earth element Nd decreases the grain size and decreases the corrosion rate of the ternary alloy. The content of the second phase in the as-cast alloy decreases obviously after solution treatment, and the corrosion rate of the ternary alloy decreases When Nd content reaches 2 wt%, the corrosion resistance and cell compatibility of Mg-4Zn-2Nd alloy are the best.