Mo微合金化对生物医用Mg-Zn合金微观组织和腐蚀性能的影响  

Molybdenum-induced Microstructural Changes and Associated Corrosion Resistance of Biodegradable Mg-Zn Alloy

作　　者：高云 王玮[1] 陈克正[1] GAO Yun;WANG Wei;CHEN Kezheng(College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;Shandong Provincial University Laboratory for Protected Horticulture,College of Civil Engineering,Weifang University of Science and Technology,Weifang 262700,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042 [2]潍坊科技学院山东省高校设施园艺实验室,建筑工程学院,山东潍坊262700

出　　处：《青岛科技大学学报（自然科学版）》2024年第6期56-64,共9页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51472133)。

摘　　要：将微量Mo元素添加到Mg-Zn合金中,采用金属模铸造法制备了Mg-2Zn-0.3Mo合金,系统研究了铸态Mg-2Zn和Mg-2Zn-0.3Mo合金的微观组织和腐蚀性能。采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)和能谱(EDS)分析了铸态Mg-2Zn和Mg-2Zn-0.3Mo合金的微观组织,应用电化学测试和Hank′s溶液(模拟人体体液)静态浸泡测试研究了其耐腐蚀性能。结果表明:铸态Mg-2Zn-0.3Mo合金由α-Mg基体、少量的MgZn相和MoZn22相组成。与Mg-2Zn合金相比,Mg-2Zn-0.3Mo合金的晶粒明显细化(100~130μm到60~80μm)。添加质量分数0.3%Mo后Mg-2Zn合金的腐蚀电流密度降低了89.23μA·cm^(-2),腐蚀速率下降了37.93%,说明微量Mo的添加使Mg-Zn合金的耐腐蚀性能得到了显著提高。In this paper,a trace amount of Mo element was added to the Mg-Zn alloy,and the Mg-2Zn-0.3Mo alloy was prepared by the metal mold casting method.The microstructure and corrosion behavior of as-cast Mg-2Zn and Mg-2Zn-0.3Mo alloys were investigated systematically.The microstructures of the as-cast Mg-2Zn and Mg-2Zn-0.3Mo alloys were analyzed by optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction analysis(XRD),and energy-dispersive spectrum(EDS).The corrosion resistance was studied by electrochemical test and immersion test in Hank's solution(simulated human body fluids).The results showed that the as-cast Mg-2Zn-0.3Mo alloys consisted of anα-Mg matrix and a small amount of MgZn phase and MoZn22 phase.Compared with the Mg-2Zn alloy,the grains were refined(100—130μm to 60—80μm).The corrosion current of the Mg-2Zn alloy decreased by 89.23μA·cm^(-2),and the corrosion rate decreased by 37.93%with 0.3%Mo addition,respectively.The addition of Mo effectively improves the corrosion resistance of the Mg-Zn alloy.Therefore,the results can provide theoretical and data support for the subsequent development of Mg-Zn-Mo alloys for biodegradable implants.

关 键 词：MG-ZN合金 腐蚀性能 微观组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]