单道次大应变轧制对AZ31镁合金组织与耐腐蚀性能的影响  

Effect of Single-pass Large Strain Rolling on Microstructure and Corrosion Resistance of AZ31 Magnesium Alloy

作　　者：李庆芬 吴远志 邓彬[1,2,3] 张洪 李理[1] 刘伟 叶拓 刘安民 LI Qing-fen;WU Yuan-zhi;DENG Bin;ZHANG Hong;LI Li;LIU Wei;YE Tuo;LIU An-min(School of Mechanical Engineering,Hunan Institute of Technology,Hengyang 421002,Hunan,China;ResearchInstitute of Auto Parts Technology,Hunan Institute of Technology,Hengyang 421002,Hunan,China;National-LocalJoint Engineering Laboratory of Design and Manufacturing Technology for Auto Pump Parts,Hunan Institute of Technology,Hengyang 421002,Hunan,China)

机构地区：[1]湖南工学院机械工程学院,湖南衡阳421002 [2]湖南工学院汽车零部件技术研究院,湖南衡阳421002 [3]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

出　　处：《矿冶工程》2019年第2期125-127,132,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51501061);湖南省高校科技创新专项支持建设团队资助项目(2014);湖南省优秀青年科学基金项目(2019JJ30009);湖南省教育厅科学研究重点项目(18A423);湖南省教育厅科学研究项目(16A051;16C0436);湖南工学院院级科研项目(2017HY022)

摘　　要：研究了单道次变形量对AZ31镁合金组织和耐腐蚀性能的影响。实验结果表明:随着单道次轧制变形量增加,镁合金组织中动态再结晶数量逐渐增多,晶粒逐步细化;合金组织细化后晶界增多,合金的耐腐蚀性能提高。单道次轧制变形量达到80%时,合金在3.5%NaCl溶液的腐蚀情况较为均匀,腐蚀速率为0.933 mm/a,自腐蚀电流密度与自腐蚀电位分别为2.054 6×10^(-3) mA/cm^2和-1.334 6 V,合金耐腐蚀性能最好。Influence of single-pass deformation on the microstructure and corrosion resistance of AZ31 magnesium alloy was studied. The experimental results showed that with the increasing of the single-pass rolling deformation,the rate of dynamic recrystallization in the microstructure of magnesium alloy increased gradually and the grain size gradually reduced. And the finer microstructure of the alloy led to an increase in the grain boundaries and the improvement of corrosion resistance of the alloy. When the single-pass rolling deformation reached 80%,the relative uniform corrosion of the alloy was found in 3.5% NaCl solution,with the corrosion rate at 0.933 mm/a,the self-corrosion current density and potential at 2.054 6 × 10^-3 mA/cm^2 and -1.334 6 V,respectively,indicating the alloy with the best corrosion resistance.

关 键 词：AZ31镁合金 轧制 变形量 耐腐蚀性能 组织 

分 类 号：TG335[金属学及工艺—金属压力加工]