(1. 上海交通大學(xué) 輕合金精密成型國家工程研究中心，上海 200240；
2. 上海交通大學(xué) 金屬基復(fù)合材料國家重點實驗室，上海 200240)
摘 要: 采用光學(xué)顯微鏡、掃描電子顯微鏡、析氫實驗和電化學(xué)實驗等研究高純Mg、AZ91D和新開發(fā)的Mg-Nd-Zn-Zr(JDBM)合金在模擬體液中的腐蝕行為。結(jié)果表明：JDBM和高純Mg的平均腐蝕速率遠(yuǎn)低于AZ91D的，且前二者的腐蝕表面較平整，為一種均勻腐蝕方式；而AZ91D的表面有許多貫連的腐蝕深坑，是一種典型的點蝕方式。動電位極化曲線、電化學(xué)阻抗譜和析氫實驗也表明，JDBM和高純Mg的耐蝕性比AZ91D的好，JDBM合金在模擬體液中的腐蝕性能接近于高純鎂的。力學(xué)性能測試表明，JDBM鎂合金具有優(yōu)良的綜合力學(xué)性能，滿足生物材料對力學(xué)性能的要求。
關(guān)鍵字: 鎂合金；生物材料；模擬體液；降解行為；力學(xué)性能
magnesium alloy in simulated body fluid
FU Peng-huai1, DING Wen-jiang1, 2
（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
