Mg-Zn-Ca合金中Zn对腐蚀性能的影响
田 杨，宋义全
（内蒙古科技大学材料与冶金学院，内蒙古包头 014010）
关键词：医用Mg-Zn-Ca合金；Hank’s模拟体液；电化学阻抗谱；极化曲线；腐蚀性能
摘要：采用熔剂保护法制备了3种Zn含量分别为0.5%、1%和2%的Mg-Zn-Ca合金，对3种镁合金在Hank’s模拟体液中进行了浸泡腐蚀实验及电化学实验测试。实验结果表明：在Hank’s模拟体液中，含锌量为0.5%镁合金腐蚀速率最小且自腐蚀电位最高；三种成分镁合金的交流阻抗谱以含锌量为0.5%镁合金的容抗弧最大，说明含锌量为0.5%的镁合金耐腐蚀性能最佳。
Effect of zincon corrosion nature ofternary Mg-Zn-Ca alloy
Tian Yang, Song Yi-quan
(Materials and Metallurgy School , Inner Mongolia University of Science and Technology, Baotou 014010,China)
Key words:Medical Mg-Zn-Ca alloy; Hank’s Simulation body fluids; EIS; polarization curve; Corrosion resistance
Abstract：Three kinds of degradable ternary Mg-Zn-Ca alloys with Zn contents of 0.5%, 1% and 2%, respectively, were fabricated by melting and casting. The mass-loss measurement and electrochemical corrosion technique were employed to study their corrosion behaviors in Hank’s simulated body fluid. TheexperimentalresultshowsthatthecorrosionrateofMg-0.5%Zn-0.5%Caalloyistheslowest,anditsfreecorrosionpotentialisthehighest.TheimpedanceofMg-0.5%Zn-0.5%Caalloyisthelargestandsotheternaryalloywith 0.5%Znpresentsanenhancedcorrosionresistance.