AZ63-Gd_1镁合金的显微组织和电化学性能  

Effect of gadolinium on microstructure and electrochemical properties of AZ63 magnesium alloy

作　　者：邓博[1] 冯拉俊[1] 姜丹[1,2] 吴伟星 DENG　Bo;FENG　Lajun;JIANG　Dan;WU　Weixing(School　of　Materials　Science　and　Engineering,Xi’an　University　of　Technology,Xi’an　710048,China;Electric　Power　Research　Institute,State　Grid　Shaanxi　Province,Xi’an　710054,China)

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]国网陕西省电力公司电力科学研究院,陕西西安710054

出　　处：《西安理工大学学报》2018年第1期122-126,共5页Journal of Xi'an University of Technology

摘　　要：采用OM、SEM、XRD及电化学测试等方法,研究了添加1wt.%稀土元素Gd对AZ63镁合金显微组织和电化学性能的影响。结果表明:添加Gd使AZ63镁合金的腐蚀均匀,电流效率提高至62%,提高了约11%;Gd的添加使Mg17Al12环链断开,呈弥散分布,含量降低,从而降低了自腐蚀;合金的相组成中增加了镁和Gd形成的GdMg2合金相。含1wt.%Gd的镁合金牺牲阳极腐蚀电位为-1.72V,负移了0.3V。The influences of rare earth elemental Gd on the microstructure and electrochemical performance of AZ63magnesium alloy are studied through the OM,SEM,XRD and electrochemical evaluation.The results show that the AZ63magnesium alloy displays the uniform corrosion and that its current efficiency is improved by 11%up to 62%with the incorporation of Gd;the ring-like structure of Mg17Al12phase is disconnected to obtain dispersive distribution and lower content through Gd addition,bringing about decreased self-corrosion;a new emergence of alloy phase GdMg2combining Mg with Gd is found;the corrosion potential of magnesium alloy sacrificial anode with 1wt.%Gd is negatively shifted by 0.3Vto-1.72V.

关 键 词：稀土元素 AZ63镁合金 显微组织 电化学性能 

分 类 号：TG172.41[金属学及工艺—金属表面处理]