Mg含量对Zn-xMg合金微观组织及电化学性能的影响  

Effect of Magnesium Content on Microstructure and Electrochemical Properties of Zn-xMg Alloy

作　　者：吴亚楠 翟赛飞 李忠慧 王启 WU Yanan;ZHAI Saifei;LI Zhonghui;WANG Qi(College of Energy Engineering,Huanghuai University,Zhumadian 463000,China)

机构地区：[1]黄淮学院能源工程学院,河南驻马店463000

出　　处：《材料保护》2024年第10期52-58,共7页Materials Protection

基　　金：河南省自然科学基金(232300421212);河南高校重点科研基础研究计划项目(22A430027);河南省科技攻关(222102240068)。

摘　　要：锌合金具有良好的生物相容性和可控的降解速率,有望成为一种新型的可降解生物可植入金属材料。利用金相显微镜、X射线衍射仪、电子扫描电镜、维氏硬度仪和电化学工作站研究了Mg含量对Zn-xMg合金(x=1.0,2.0,5.0,7.5,10.0,质量分数,%)显微组织演化、显微硬度、析氢和耐腐蚀性能的影响。试验结果表明:随着Mg含量的增加,晶粒尺寸逐渐减小,并在X射线衍射谱中出现新的衍射峰,合金中生出新相Mg_(2)Zn_(11);当Mg含量达到5.0%时出现MgZn_(2)化合物,此时晶粒由等轴状转变为取向互相交叉的树枝状,且随着Mg含量的增加,树枝晶逐渐粗化。同时,随着Mg含量的增加,Zn-xMg合金的硬度呈现先增加后降低的趋势,Zn-7.5Mg合金的硬度达到最大值(120 HV_5)。Hank’s溶液介质中的电化学测试结果表明,Zn-7.5Mg合金的耐腐蚀性较好,析氢性能最好。Zinc alloy has good biocompatibility and controlled degradation rate,which is expected to be a new type of biodegradable bioimplant-able metal material.The effect of Mg content on microstructure evolution,microhardness,hydrogen precipitation and corrosion resistance of Zn-xMg alloys(x=1.0,2.0,5.0,7.5,10.0,mass fraction,%)was investigated by using metallurgical microscope,X-ray diffractometer,electron scanning electron microscope,Vickers hardness tester and electrochemical workstation.Results showed that with the increase of Mg content,the grain size decreased gradually,and several new diffraction peaks appeared in the X-ray diffraction spectrum,giving rise to a new phase Mg2Zn11 in the alloy.MgZn_(2) compounds appeared when the Mg content reached 5.0%,at which time the grains were transformed from equiaxed to dendritic with intersecting orientations,and the dendritic crystals were gradually coarsened with the increase of Mg content.Meanwhile,the hardness of Zn-xMg alloys showed an increasing and then decreasing trend with increasing Mg content,and the hardness of Zn-7.5Mg alloy reaches the maximum value(120 HV5).The results of electrochemical tests in Hank’s solution medium exhibited that the Zn-7.5Mg alloy had better corrosion resistance and the best hydrogen precipitation performance.

关 键 词：Zn-Mg合金 Mg含量 微观组织演化 显微硬度 腐蚀性能 析氢性能 

分 类 号：TG172[金属学及工艺—金属表面处理]