晶粒尺寸对生物医用Mg-3Zn-0.2Ca-0.2Mn合金降解行为的影响  

Effect of grain size on degradation behavior of Mg-3Zn-0.2Ca-0.2Mn alloy for biomedical application

作　　者：崔珠殷 李淑波[1] 付军健 刘轲[1] 王朝辉[1] 杜文博[1] CUI Zhu-yin;LI Shu-bo;FU Jun-jian;LIU Ke;WANG Zhao-hui;DU Wen-bo(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124

出　　处：《中国有色金属学报》2023年第3期665-677,共13页The Chinese Journal of Nonferrous Metals

基　　金：北京市教委科技发展基金资助项目(KZ201810005005);国家自然科学基金资助项目(51801004);北京市自然科学基金资助项目(2192006)。

摘　　要：本文通过固溶工艺调控,获得第二相含量相近、晶粒尺寸不同的Mg-3Zn-0.2Ca-0.2Mn合金,对具有不同晶粒尺寸的合金在Hank’s模拟体液中进行浸泡及电化学实验,通过观察降解后的合金形貌,研究并分析了晶粒尺寸对生物医用Mg-3Zn-0.2Ca-0.2Mn合金降解行为的影响。通过电化学实验可知,合金晶粒尺寸越小,腐蚀电流密度越小,阻抗值越大;通过浸泡实验及对合金表面形貌的观察可知,随着晶粒尺寸的减小,合金降解速率减慢,表面腐蚀坑尺寸越小且分布越均匀,合金的耐蚀性越好。合金降解过程中晶粒尺寸是通过影响合金降解产物膜的致密度及完整性,进而影响合金的耐蚀性能,即合金的晶粒尺寸越小,表面形成的产物膜越致密和完整,溶液中的Cl-吸附于表面后不易渗透至内部,从而使合金耐蚀性得到提高。In this paper,Mg-3Zn-0.2Ca-0.2Mn alloys with similar second phase content and different grain sizes were obtained through the solid solution process,and the alloys with different grain sizes were subjected to immersion and electrochemical experiments in Hank’s simulated body fluid.The effect of grain size on the degradation behavior of biomedical Mg-3Zn-0.2Ca-0.2Mn alloy was investigated and analyzed.The electrochemical experiment shows that the smaller the grain size of the alloy,the smaller the corrosion current density,and the larger the impedance value.The immersion experiment and the observation of the surface morphology shows that,with the decrease of the grain size,the degradation rate of the alloy slows down,the surface corrosion pit size is smaller and more uniformly distributed,and the corrosion resistance of the alloy is better.In the process of alloy degradation,the grain size affects the corrosion resistance of the alloy by affecting the density and integrity of the degradation product film.The smaller the grain size of the alloy,the denser and more complete the product film formed on the surface,and the Cl−adsorbed on the surface is not easy to penetrate into the interior,which helps to improve the corrosion resistance of the alloy.

关 键 词：Mg-Zn-Ca-Mn合金 固溶处理 晶粒尺寸 耐蚀性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]