新型医用Mg_((98.7-x))-Zn_(1.0)-Ca_(0.3)-Mn_x合金在hank's模拟体液中的降解行为  

Degradable behaviors of new-type medical Mg_((98.7-x))-Zn_(1.0)-Ca_(0.3)-Mn_x alloys in Hank's simulated body fluid

作　　者：王国斌[1] 郭兵 丁雨田[3] 

机构地区：[1]银川能源学院机械与汽车工程学院,银川750010 [2]长城汽车集团有限公司,河北保定071000 [3]兰州理工大学甘肃省有色金属新材料重点实验室,兰州730050

出　　处：《华中师范大学学报（自然科学版）》2016年第1期87-92,共6页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(11004091);浙江省自然科学基金项目(Y4090219);甘肃省自然科学基金项目(0916RJZA025);兰州理工大学博士基金项目(SB01200606)

摘　　要：采用真空感应熔炼,结合熔融浇铸法制备了可降解Mg（98.7-x）-Zn1.0-Ca0.3-Mnx四元合金材料.利用光学显微镜、X射线衍射仪,扫描电镜对合金进行分析和表征.并运用浸泡实验和电化学实验探讨了合金在hank＇s模拟体液中的降解行为.结果表明：Mn含量为1.5%时,铸态镁合金的晶粒得到显著细化,晶粒尺寸减小到20~30μm;Mn元素可促进Ca原子在Mg基体中形成均匀分布的Mg_2Ca相,从而改善合金的抗腐蚀性能;合金的腐蚀速率随Mn含量的增加而显著降低,加入1.7%Mn时,其平均腐蚀速率和电化学腐蚀速率分别降低到0.135 mm/a和0.265 mm/yr,合金的抗腐蚀性能达到最佳值;合金的局部腐蚀严重,存在＂河流状＂和＂骨架状＂的腐蚀形貌;腐蚀产物主要由Mg（OH）_2、MgCO_3、Mg_3（PO_4）_2以及少许MgO与Mg颗粒组成.The degradable quaternary Mg_（（98.7-x））-Zn_（1.0）-Ca_（0.3）-Mn_x alloys were fabricated by using vacuum induction melting and casting method.The alloys were analyzed and characterized by the optical microscopy（OM）,X-ray diffraction（XRD）and scanning electron microscopy（SEM）.The degradable behaviors of alloys in hank＇s simulated body fluid were discussed by immersion test and electrochemical technique.The results indicated that the addition of 1.5% Mn element significantly refined the grain size of cast magnesium alloy,which decreased to 20~30μm.Adding Mn also promoted the formation of a uniformly distributed Mg_2Ca phase of Ca atoms in the Mg matrix,which improved the corrosion resistance of the alloy.Meanwhile,the corrosion rate of the alloys remarkably decreased with increasing Mn content.When Mn content is 1.7%,the average corrosion rate and the electrochemical corrosion rate diminished to 0.135mm/a and 0.265mm/yr,respectively,achieving the best value of corrosion resistance.Localized corrosion of the alloys was serious,displaying the＂river-like＂and ＂skeleton-like＂corrosion morphology.The corrosion products mainly consisted of Mg（OH）_2,MgCO_3,Mg_3（PO_4）_2 as well as a small amount of MgO and Mg particles.

关 键 词：Mg(98.7-x)-Zn1.0-Ca0.3-Mnx合金 hank's模拟体液 显微组织 降解行为 

分 类 号：TG174.22[金属学及工艺—金属表面处理]