医用Mg-Zn-Ca-Mn合金在PBS模拟体液中的腐蚀行为  

Corrosion Behaviors of Biomedical Mg-Zn-Ca-Mn Alloys in PBS Simulated Body Fluid

作　　者：丁雨田[1,2] 郭兵[1] 胡勇[1] 纪国庆[1] 柴利强[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050 [2]兰州理工大学甘肃省有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《材料导报》2012年第6期1-6,共6页Materials Reports

基　　金：兰州理工大学博士基金(SB01200606)

摘　　要：利用真空感应熔炼,采用金属模浇铸制备了Mg(100-x-y-z)-Znx-Cay-Mnz四元合金。使用光学显微镜、X射线衍射仪、扫描电镜及能谱仪对合金进行分析和表征。探讨了合金在PBS模拟体液中的腐蚀行为。结果表明,Ca、Zn及Mn原子的复合加入可显著细化合金的铸态显微组织;镁合金的腐蚀发生于晶粒内部,至晶界处终止;当加入2.0%的Zn和0.5%的Ca时,铸态合金的抗腐蚀性能最佳(平均腐蚀速率为0.77mm/a);当Zn、Ca含量均大于1%时,固溶时效态合金的腐蚀速率下降为铸态的1/2～1/4,表现出优异的耐蚀性;固溶时效处理可有效减少Mg2Ca相的体积分数,改善其分布,提高合金的耐蚀性能。The quaternary and metal mold casting method. Mg（100-x-y-x）-Znx-Cay-Mnx alloy was fabricated by using vacuum induction melting The analysis and characterization of alloys were studied by the optical microscopy （OM）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and spectrum analysis. The corrosion behaviors of alloys in PBS simulated body fluid（SBF） were investigated by the immersion test. The results show that the micro- structure can be significantly refined by the composite adding of Ca, Zn and Mn atoms. Corrosion of magnesium alloy starts from the grain inside and extends to the grain boundaries. Under the conditions of the cast, when the content of Zn and Ca were 2. 0M and 0. 5% respectively, the alloy has the best corrosion resistance（the average corrosion rate is O. 77ram/a）. When the level of Zn, Ca were greater than 1%, the solution and aging state of alloy corrosion rate is 1/2 to 1/4 times than the cast, and it exhibited excellent corrosion resistance. Solution and aging treatment can effec- tively reduce the volume fraction of Mg2Ca phase and improve its distribution, so that it can significantly improve the alloys＇ corrosion resistance.

关 键 词：Mg-Zn-Ca-Mn合金PBS模拟体液显微组织腐蚀行为 

分 类 号：TB34[一般工业技术—材料科学与工程] TG174.22[金属学及工艺—金属表面处理]