石墨烯对AZ31镁合金在模拟体液中腐蚀性能的影响  

Effect of Graphene on the Corrosion Performance of AZ31 Magnesium Alloy in Simulated Body Fluids

作　　者：刘乃华 华振虎 蓝永庭[1] LIU Naihua;HUA Zhenhu;LAN Yongting(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545616,China)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545616

出　　处：《有色金属工程》2023年第6期1-8,共8页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(12262003,11862002);广西省自然科学基金项目(2022GXNSFAA035537);广西科技大学博士基金项目(校科博21Z13);广西科技大学研究生教育创新计划项目(GKYC202204)。

摘　　要：镁合金具有良好的生物相容性和降解性能,在生物医疗领域具有广泛的应用前景,但镁合金耐蚀性较差成为制约其推广应用的瓶颈。针对石墨烯纳米片(Graphene Nanoplatelets, GNPs)增强镁合金AZ31+xGNPs(x=0%、0.1%、0.3%、0.6%),开展了金相显微镜(OM)、X射线衍射(XRD)、扫描电子显微镜(SEM)与能谱(EDS)、失重和电化学测试等实验,以探索石墨烯对镁合金AZ31在模拟体液(Simulate bodily fluids, SBF)中腐蚀性能的影响。结果表明,石墨烯(GNPs)的添加并未改变原有镁合金的物相,且细化AZ31镁合金晶粒,改善晶粒大小分布的不均匀性。随着石墨烯含量的增加,AZ31镁合金在SBF模拟体液中的重量损失减少,腐蚀速率降低,腐蚀电位升高,腐蚀电流密度降低。分析表明,石墨烯增强镁合金AZ31在SBF模拟体液中的耐腐蚀性能得到增强,且随着石墨烯(GNPs)含量的增加而增强。Magnesium alloys have good biocompatibility and degradation properties,and have a wide application prospect in the biomedical field,but the poor corrosion resistance of magnesium alloys has become a bottleneck that restricts their popularization and application.In this paper,for graphene nanoplatelets(GNPs)reinforced magnesium alloy AZ31+x GNPs(x=0%,0.1%,0.3%,0.6%),metallographic microscopy(OM),X-ray Diffraction(XRD),Scanning Electron Microscopy(SEM)with Energy Disperse Spectroscopy(EDS),weight loss experiments and electrochemical were carried out.The experiments were conducted to explore the effects of graphene on the corrosion performance of magnesium alloy AZ31 in Simulate Bodily Fluids(SBF).The experimental results showed that the addition of graphene(GNPs)did not change the physical phase of the original magnesium alloy,but refined the AZ31 magnesium alloy grains and improved the inhomogeneity of grain size distribution.With the increase of graphene content,the weight loss of AZ31 magnesium alloy in the SBF simulated body fluid decreased,the corrosion rate decreased,the corrosion potential increased and the corrosion current density decreased.The results showed that the corrosion resistance of graphene-reinforced magnesium alloy AZ31 in SBF simulated body fluid was enhanced and increased with the increase of graphene(GNPs)content.

关 键 词：AZ31镁合金 石墨烯 晶粒细化 腐蚀 模拟体液(SBF) 

分 类 号：TG172[金属学及工艺—金属表面处理]