第二相对Mg-Zn-Zr合金腐蚀行为的影响  

Effect of the Second Phase on the Corrosion Behavior of Mg-Zn-Zr alloy

作　　者：邓彬 李庆芬[3] 吴远志 刘超 刘伟[1,2,3] 聂志诚 刘安民 DENG Bin;LI Qing-fen;WU Yuan-zhi;LIU Chao;LIU Wei;NIE Zhi-cheng;LIU An-ming(Research Institute of Auto Parts Technology,Hunan Institute of Technology,Hengyang 421002,China;National-Local Joint Engineering Laboratory of Design and Manufacturing Technology for Auto Pump Parts,Hunan Institute of Technology,Hengyang 421002,China;School of Mechanical Engineering,Hunan Institute of Technology,Hengyang 421002,China;College of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南工学院汽车零部件技术研究院,湖南衡阳421002 [2]湖南工学院汽车泵类零部件设计制造技术国家地方联合工程实验室,湖南衡阳421002 [3]湖南工学院机械工程学院,湖南衡阳421002 [4]湖南科技大学材料与工程学院,湖南湘潭411201

出　　处：《材料保护》2021年第9期48-53,共6页Materials Protection

基　　金：国家自然科学基金项目(52171115);湖南省自科基金项目(2019JJ30009);湖南省教育厅科学研究项目(20C0567,19C0508);衡阳市科技计划项目基础研究专项(202002042096)资助。

摘　　要：为研究第二相对Mg-Zn-Zr合金腐蚀行为的影响,以ZK60镁合金为例,使用金相显微镜(OM)、扫描电子显微镜(SEM)与能谱仪(EDS)等对不同第二相含量与分布的镁合金在3.5%NaCl溶液中的腐蚀行为及其机理进行了研究。结果表明:第二相的含量和分布都会影响其耐蚀性能,其中第二相的分布状态是关键影响因素,第二相呈分散分布的试样其耐蚀性要明显优于第二相呈条带状连续分布的试样。出现以上差别的主要原因是两者具备不同的腐蚀类型,第二相呈连续分布时的腐蚀主要为电偶腐蚀,而第二相呈分散分布时电偶腐蚀与化学腐蚀交替进行。In order to study the effect of the second phase on the corrosion behavior of Mg-Zn-Zr alloy,using ZK60 as samples,the corrosion behavior and mechanism of magnesium alloy with different second phase content and distribution in 3.5%(mass fraction)NaCl solution were investigated by optical microscope(OM),scanning electron microscope(SEM)and energy dispersive X-Ray spectroscopy(EDS).Result showed that both the content and distribution of the second phase would affect the corrosion resistance,and the distribution of the second phase was the main factor.The corrosion resistance of the samples with dispersed second phase was better than that of the samples with continuous strip distribution.The main reason for the above differences was that they had different corrosion types:when the second phase was distributed continuous,the main corrosion type was galvanic corrosion;when the second phase distributed dispersedly,galvanic corrosion and chemical corrosion occurred alternately.

关 键 词：Mg-Zn-Zr合金 第二相 分布状态 腐蚀行为 热处理 

分 类 号：TG172[金属学及工艺—金属表面处理]