(1. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200240；
2. 上海交通大学 金属基复合材料国家重点实验室，上海 200240)
摘 要: 采用光学显微镜、扫描电子显微镜、析氢实验和电化学实验等研究高纯Mg、AZ91D和新开发的Mg-Nd-Zn-Zr(JDBM)合金在模拟体液中的腐蚀行为。结果表明：JDBM和高纯Mg的平均腐蚀速率远低于AZ91D的，且前二者的腐蚀表面较平整，为一种均匀腐蚀方式；而AZ91D的表面有许多贯连的腐蚀深坑，是一种典型的点蚀方式。动电位极化曲线、电化学阻抗谱和析氢实验也表明，JDBM和高纯Mg的耐蚀性比AZ91D的好，JDBM合金在模拟体液中的腐蚀性能接近于高纯镁的。力学性能测试表明，JDBM镁合金具有优良的综合力学性能，满足生物材料对力学性能的要求。
关键字: 镁合金；生物材料；模拟体液；降解行为；力学性能
magnesium alloy in simulated body fluid
（1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The corrosion behaviors of pure Mg, AZ91D and Mg-Nd-Zn-Zr (JDBM) alloys in simulated body fluid (SBF) were studied by the optical microscopy, scanning electron microscopy (SEM), hydrogen evolution test and electrochemical technique. The results show that the average corrosion rate of JDBM or pure Mg is much lower than that of AZ91D, and the surfaces of JDBM and pure Mg samples after immersion test are smooth, while the surface of AZ91D sample show many conjoint deep pits. The potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and hydrogen evolution tests also show that JDBM and pure Mg exhibit better corrosion resistance than AZ91D, while the corrosion behavior of JDBM is similar to that of pure Mg. The JDBM alloy has excellent mechanical properties to meet the requirements of implant biomaterials. And the JDBM alloy is a kind of promising magnesium alloy which is suitable to be applied as degradable biomaterials.
Key words: Mg alloy; biomaterial; simulated body fluid; degradable behavior; mechanical properties
