固溶处理对可生物降解Mg-6Zn合金腐蚀性能的影响（英文）

发布时间：2018-09-17 14:30

【摘要】：对可生物降解二元Mg-6Zn合金进行固溶处理,来评价获得的显微组织变化对合金降解速率的影响及其相关机理。在350°C条件下固溶处理6~48 h。采用光学显微镜、扫描电镜、能量色散X射线光谱仪和X射线衍射仪分析铸态和固溶处理后试样。在37°C的模拟体液中进行浸泡和电化学测试,评价其抗腐蚀性。为保证腐蚀测试的结果,对p H值进行测试。结果发现,大于24 h的固溶处理,金属间化合物相溶解于基体中,并产生了近单晶相组织。金属间化合物相的减少导致阴极区/阳极区比减小且腐蚀率降低。电化学和失重测试结果表明,延长固溶处理时间可提高合金的抗腐蚀性。经350°C固溶处理24 h后,铸态合金的抗腐蚀性提高了60%以上。另外,逐渐减少的金属间化合物相和伴随的低p H值上升,降低了腐蚀速率。对于Mg-Zn合金作为生物可降解移植材料的应用,固溶处理是一种可以提高腐蚀性的工艺。
[Abstract]:The biodegradable binary Mg-6Zn alloy was treated with solid solution to evaluate the effect of the microstructure change on the degradation rate of the alloy and its related mechanism. The solution treatment was carried out at 350 掳C for 648 h. The as-cast and solution treated samples were analyzed by optical microscope, scanning electron microscope, energy dispersive X-ray spectrometer and X-ray diffractometer. The corrosion resistance was evaluated by immersion and electrochemical test in 37 掳C simulated body fluid. In order to ensure the result of corrosion test, the pH value was tested. The results show that the intermetallic compound phase dissolves in the matrix after solution treatment for more than 24 h, and the near single crystal phase is formed. The decrease of intermetallic compound phase leads to the decrease of cathode / anode area ratio and the decrease of corrosion rate. The results of electrochemical and weightlessness test show that the corrosion resistance of the alloy can be improved by prolonging the time of solution treatment. After solution treatment at 350 掳C for 24 h, the corrosion resistance of the as-cast alloy was increased by more than 60%. In addition, the decreasing intermetallic compound phase and the accompanying low pH value decreased the corrosion rate. For the application of Mg-Zn alloy as biodegradable transplantation material, solid solution treatment is a process that can improve corrosion.
【作者单位】： Department
【基金】：the Ministry of Higher Education of Malaysia for the financial support (Vote No. Q.J130000.2524.04H18) Faculty of Mechanical Engineering of Universiti Teknologi Malaysia (UTM) for providing research facilities
【分类号】：TG166.4

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