文献类型：期刊文献

中文题名：变形程度对镁合金板材力学性能和耐腐蚀性能的影响

英文题名：Mechanical Property and Corrosion Resistance of Magnesium Alloy Sheet with Different Deformation Degrees

作者：杨江 彭建 孙松 王佳文 潘复生

第一作者：杨江

通信作者：Peng, Jian

机构：[1]贵州理工学院材料与冶金工程学院,贵州贵阳550003;[2]重庆大学材料科学与工程学院,重庆400044;[3]重庆市科学技术研究院,重庆401123

第一机构：贵州理工学院材料与冶金工程学院

年份：2018

卷号：42

期号：1

起止页码：21-28

中文期刊名：稀有金属

外文期刊名：Chinese Journal of Rare Metals

收录：CSTPCD;;EI(收录号：20182005188648);Scopus(收录号：2-s2.0-85046799657);北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家重点研发计划项目(2016YFB0301100);国家自然科学基金项目(51501045);贵州省自然科学基金项目(J[2015]2067);贵州理工学院高层次人才基金项目(XJGC20141102);中央高校基本科研业务费(106112017CDJPT130002)资助

语种：中文

中文关键词：镁合金;耐腐蚀性;显微组织;力学性能

外文关键词：Mg alloy ; corrosion resistance ; microstructure ; mechanical property

摘要：镁合金板材具有非常优良的力学性能和耐腐蚀性能，其应用需求日益增大。为进一步提高镁合金板材的性能，通过金相显微镜（OM）、扫描电子显微镜（SEM），电子背散散衍射（EBSD）、力学性能测试、析氢腐蚀、失重腐蚀、电化学极化测试和电化学阻抗测试等手段，研究了变形程度对Mg-SAl-0．4Mn-0．8Ca合金显微组织、力学性能和耐腐蚀性能的影响。结果表明，挤压比的升高导致合金晶粒明显细化，合金组织均匀程度降低。随着挤压比的升高，合金强度略有提高，塑性大幅度提高。合金析氢量、腐蚀失重程度和电化学腐蚀电流密度也随着挤压比的升高而升高，导致合金耐腐蚀性能降低。当挤压比为9时，合金的组织均匀和织构弱化使其具有最佳的耐腐蚀性能，合金腐蚀电流密度和腐蚀失重分别为11．26μA·Cm^-2和19．01mg·cm-2·d^-1。
Magnesium alloy sheets have good mechanical properties and corrosion resistance, which show wide application prospects. In order to improve the properties of magnesium alloy sheets, the effect of deformation degree on the microstructures, mechanical prop- erties and corrosion resistances of Mg-5A1-0.4Mn-O. 8Ca alloys was investigated by the optical microscopy （OM）, scanning electronic microscopy （SEM）, electron backscattered diffraction （EBSD）, mechanical property test, hydrogen evolution test, weight loss test, electrochemical polarization test and electrochenfical impedance test. The results showed that with the increase of extrusion ratio, the grains of alloy were obviously refined and the uniformity degree of microstructure decreased. As the extrusion ratio increased, the strength improved slightly and the plasticity improved significantly. Meanwhile, the hydrogen evolution, weight loss and electrochemical current density increased with the rising extrusion ratio, leading to the decreasing corrosion resistance of alloy. When the extrusion ratio was 9, the alloy had the best corrosion resistance with the corrosion current density and the corrosion weight loss of 11.26 μA-cm-2 and 19.01 mg-cm-2.d-l, respectively, induced by the homogeneous microstructures and the weakened texture.