LZ91铸态合金生物腐蚀机理研究  

Research of Bio-corrosion Behavior on As-cast LZ91 Alloy

作　　者：万贻敏 刘俊伟[1] 袁荣火 戴木海 刘佩垚 

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《矿冶工程》2016年第1期117-120,共4页Mining and Metallurgical Engineering

基　　金：江西省自然科学基金(20122BAB216015);江西省青年科学基金(20141522040222);江西省科技支撑项目(20141122040007);燕山大学亚稳材料制备技术与科学国家重点试验室开放课题(201405);上海航天科技创新基金(SAST201328);航天科技创新基金(BA201401259);江西省金属材料微结构调控重点试验开放课题(LW201101)

摘　　要：设计了Mg-9Li-Zn铸态合金在模拟体液(SBF)中的腐蚀实验,通过试样失重率、溶液p H值变化、金相分析(OM)、X射线衍射(XRD)等手段,对Mg-9Li-Zn的微观组织和腐蚀性能进行了研究。结果表明:腐蚀速率在第5天后稳定下降,溶液p H值则在前7天逐渐增至9.63,随后保持稳定。微小的点蚀坑出现在腐蚀的第1天,随着腐蚀时间增加,点蚀坑数量变多,深度增加。点蚀坑首先出现在晶界附近区域,使晶粒边界模糊,然后逐渐增大。主要的腐蚀产物为Mg(OH)_2。Experiments on bio-corrosion of cast Mg-9Li-Zn alloy in artificial body fluid were performed. The microstructure and corrosion property were investigated by measurement of weight loss rate and pH value variation, optical microscopy （OM） and XRD analyses. The results showed that the corrosion rate stably decreased after 5 days＇ corrosion, while the pH value gradually increased to 9.63 in the first 7 days and then kept stable. Tiny erosion pits occurred after 1-day corrosion, and gradually increased and went deeper with the increasing of corrosion time. Erosion pits firstly appeared near grain boundaries and led to obscure and broadening of the grain boundary, with Mg（ OH）2 as the main corrosion product.

关 键 词：镁锂合金 生物腐蚀 模拟体液 组织 

分 类 号：TG115[金属学及工艺—物理冶金]