Nd合金化对生物医用Mg-Zn-Sn合金腐蚀性能的影响  

Effects of Nd Alloying on Corrosion Resistance of Biomedical Mg-Zn-Sn Alloys

作　　者：高云 赵平[1] 王玮 陈克正[1] Gao Yun;Zhao Ping;Wang Wei;Chen Kezheng(College of Material Science and Engineering,Qingdao University of Science and Technology;Shandong Provincial University Laboratory for Protected Horticulture,College of Civil Engineering,Weifang University of Science and Technology)

机构地区：[1]青岛科技大学材料科学与工程学院 [2]潍坊科技学院山东省高校设施园艺实验室,建筑工程学院

出　　处：《特种铸造及有色合金》2023年第5期641-646,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51472133);山东省自然科学基金资助项目(ZR2020ME009)。

摘　　要：将稀土元素Nd添加到Mg-2Zn-3Sn合金中,采用金属型铸造制备了Mg-2Zn-3Sn-xNd(x=0,0.5,1,2,质量分数,%)合金,采用光学显微镜(OM)、扫描电镜(SEM)及X射线衍射(XRD)等分析了铸态Mg-2Zn-3Sn-xNd合金的微观组织,应用电化学测试和Hank’s溶液静态浸泡测试研究了其耐腐蚀性能。结果表明,铸态Mg-2Zn-3Sn-xNd合金由α-Mg相、MgSnNd相、Mg2Sn相和少量的MgZn相组成。与Mg-2Zn-3Sn合金相比,Mg-2Zn-3Sn-xNd合金的晶粒得到明显细化。少量Nd(0.5%、1%)可提高Mg-2Zn-3Sn合金的耐腐蚀性,但当Nd的添加量较高时(2%),电偶腐蚀加剧,合金的耐腐蚀性能降低。Mg-2Zn-3Sn-0.5Nd合金的耐腐蚀性能最佳,说明适量Nd可改善Mg-2Zn-3Sn合金的耐腐蚀性。Mg-2Zn-3Sn-xNd(x=0,0.5,1,2,%)alloys were prepared by metal mold casting.The microstructure of as-cast Mg-2Zn-3Sn-xNd alloys was observed by optical electron microscopy(OM),scanning electron microscopy(SEM)and X-ray diffraction(XRD).The corrosion resistance of alloys was investigated by electrochemical test and solution immersion test in Hank's solution.The results reveal that Mg-2Zn-3Sn-xNd alloys consists ofα-Mg matrix,MgSnNd phase,Mg_2Sn phase and a small amount of MgZn phase.Compared with Mg-2Zn-3Sn alloy,the grain size of Mg-2Zn-3Sn-xNd alloys are obviously refined.The corrosion resistance of Mg-2Zn-3Sn alloy is improved by adding a small amount of Nd(0.5%,1%).However,when the addition amount of Nd is 2%,the corrosion resistance of the alloy is greatly reduced due to galvanic corrosion,and Mg-2Zn-3Sn-0.5Nd alloy possesses optional corrosion performance,which reveal that appropriate Nd can improve the corrosion resistance of Mg-2Zn-3Sn alloy.

关 键 词：Mg-Zn-Sn-Nd合金 腐蚀性能 微观组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG172.7[金属学及工艺—金属材料]