毕业设计说明书中文摘要镁合金作为生物可降解性植入物具有一些独特的优点,但降解速率过快是限制其发展的因素。镁基非晶合金较常规的镁合金具有较好的耐腐蚀性,同时,添加稀土元素可在其表面生成氧化膜增加耐腐蚀性能。本文使用感应熔炼母合金,并利用单铜辊模甩带获得Mg68-XZn28Ca4REX(RE=Y,Tb,La,Dy,X=0,1,3)的非晶合金样品。利用X射线衍射,DSC等检测手段分析非晶合金样品的微观结构和热稳定性。采用动电位扫描及电化学交流阻抗谱(EIS)的电化学测试方法,分别研究了镁基非晶合金在0。144MNaCl溶液、0。2MPBS溶液和模拟体液中非晶合金的电化学腐蚀行为。结果表明镁基非晶合金样品具有良好的耐腐蚀性,添加稀土元素Y、Tb、La能有效增加非晶的耐腐蚀性,且非晶合金的耐腐蚀性整体随添加量的增添而增加。添加Dy的非晶样品耐腐蚀性增加不明显,原因是样品发生了晶化。81223
毕业论文关键词 镁基非晶合金 电化学行为 耐腐蚀性 极化曲线 电化学交流阻抗
毕业设计说明书外文摘要
Title Electrochemical behavior of biodegradable magnesium-based amorphous alloys
Abstract Magnesium-based amorphous alloys as biodegradable implant has some unique advantages, but excessive degradation rate limiting it’s development。 the rare earth oxide film can be generated on the surface to increase corrosion resistance。 Mg68-XZn28Ca4REX(RE=Y,Tb,La,Dy,X=0,1,3)amorphous alloys were prepared by Induction melting, Single-mode rejection copper roll band and Copper mold casting。 XRD were used to determine the structure of amorphous alloy, DSC were used to analysis the samples’ thermal stability, Polarization curve and ac impedance spectroscopy were utilized to study the electrochemical properties of amorphous alloy in 0。144M NaCl solution,0。2M PBS solution and Hanks’ solution。 The results show that the amorphous alloy samples exhibit good corrosion resistance, Adding rare earth elements Y, Tb, La can effectively increase the corrosion resistance of the amorphous, The corrosion resistance of the amorphous alloys increase with the minor addition。 Amorphous sample Adding Dy did not significantly increase the corrosion resistance,The reason is that the sample crystallization occurred。
Keywords Mg-base amorphous alloy The electrochemical behavior Corrosion resistance polarization curve EIS element distribution
目 次
1 绪论 1
1。1 非晶合金简介及研究现状 1
1。2 非晶合金的制备方法 1
1。2。1 非晶薄带制备方法 1
1。2。2 非晶块体的制备方法 1
1。3 镁基非晶合金的研究现状 2
1。3。1 镁及镁合金材料的优点 2
1。3。2 镁基非晶合金在生物材料的研究现状 3
1。3。3 MgZnCa合金用于生物材料的研究 3
1。4 课题研究的目的和主要内容 4
2 实验内容及方法 5
2。1 实验内容 5
2。2 实验原料及仪器