摘要
选取组织性能和力学性能较好的锻造态Mg-Zn-Zr可降解生物医用镁合金作为研究对象,通过金相组织观察、SEM扫描、XRD物相分析及拉伸试验研究了锻造态Mg-Zn-Zr镁合金的宏观和微观组织以及力学性能,并进一步确定了锻造态Mg-Zn-Zr合金的第二相组成.通过静态浸泡腐蚀失重实验研究纯镁和锻造态Mg-Zn-Zr镁合金在(37±0.5)℃恒温SBF模拟体液中的腐蚀降解速率;采用SEM扫描+EDS能谱分析技术手段对锻造态Mg-Zn-Zr镁合金腐蚀后的试样表面及腐蚀产物形貌进行分析,研究锻造态Mg-Zn-Zr镁合金的腐蚀类型、腐蚀程度及腐蚀机理.结果显示,与纯镁相比,锻造态Mg-5.45Zn-0.38Zr镁合金具有优良的力学性能.随着Zn、Zr的加入,锻造态镁合金的显微组织细化,从而使锻造态Mg-5.45 Zn-0.38Zr合金的力学性能得到很大的提高.锻造态Mg-5.45Zn-0.38Zr静态浸泡腐蚀实验结果表明,与纯镁相比,添加Zn、Zr元素可以提高镁合金耐腐蚀性.用失重法测得的锻造态Mg-5.45Zn-0.38Zr合金在(37±0.5)℃恒温SBF模拟体液浸泡腐蚀240 h后的平均腐蚀速率为0.93 mm/a.锻造态Mg-5.45Zn-0.38Zr合金的耐腐蚀性能优于纯镁.
In this paper,Mg-Zn-Zr biodegradable biomedical magnesium alloy with good microstructure and mechanical properties was selected as the research object.The macro and micro structures and mechanical properties of Mg Zn Zr magnesium alloy as forged were studied by metallographic observation,SEM scanning,XRD phase analysis and tensile test,and the second phase composition of Mg-Zn-Zr alloy as forged was further determined.The corrosion degradation rate of pure magnesium and forged Mg-Zn-Zr magnesium alloy in SBF simulated body fluid at(37±0.5)℃was studied through static immersion corrosion weightlessness experiment;the surface and corrosion product morphology of forged Mg-Zn-Zr magnesium alloy after corrosion were analyzed by SEM scanning+EDS energy spectrum analysis,and the corrosion type,corrosion degree and corrosion machine of forged Mg-Zn-Zr magnesium alloy were studied.The results show that the as forged Mg-5.45Zn-0.38Zr magnesium alloy has excellent mechanical properties compared with pure magnesium.With the addition of Zn and Zr,the microstructure of as forged Mg alloy is refined,which greatly improves the mechanical properties of as forged Mg-5.45Zn-0.38Zr alloy.The results of static immersion corrosion test of Mg-5.45Zn-0.38Zr as forged show that the addition of Zn and Zr elements can improve the corrosion resistance of magnesium alloy compared with pure magnesium.The average corrosion rate of Mg-5.45Zn-0.38Zr alloy was 0.93 mm/a after 240 h immersion in SBF at(37±0.5)℃.The corrosion resistance of as forged Mg-5.45Zn-0.38Zr alloy is better than that of pure magnesium.
作者
马春华
许东光
冷玉敏
MA Chunhua;XU Dongguang;LENG Yumin(School of Mechanical and Electronic Engineering,Nanyang Normal University,Nanyang 473061,Henan,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Henan Rare-earth Alloy Material Engineering and Engineering Research Center,Nanyang 473061,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China)
出处
《南阳师范学院学报》
CAS
2020年第1期36-43,共8页
Journal of Nanyang Normal University
基金
河南省自然科学基金项目(162300410207)
河南省科技厅科技攻关项目(172102210425)
河南省教育厅项目(14B430016)
