摘要
通过腐蚀浸泡实验和电化学阻抗谱测试,研究了微量Zr的添加对Al-Zn-Mg-Mn合金板材抗剥落腐蚀性能的影响,并结合金相显微镜(OM)、电子背散射衍射技术(EBSD)、扫描透射电镜(STEM)等显微组织表征结果对影响机理进行分析和讨论。结果表明:在Al-Zn-Mg-Mn板材中添加微量Zr可以改善抗剥落腐蚀性能,剥落腐蚀等级由EB级变为EA级,最大腐蚀深度由593μm降至421μm。通过分析板材晶粒组织的差异和晶界η相尺寸、间距和化学成分的变化及无沉淀析出带宽度的变化,认为添加微量Zr后是通过综合作用来影响材料的剥落腐蚀行为。
The effect of minor Zr addition on exfoliation corrosion resistance of Al-Zn-Mg-Mn alloy sheet was studied by means of standard exfoliation corrosion immersion tests and electrochemical impedance spectroscope(EIS) technique combined with optical microscopy(OM), electron back scattering diffraction(EBSD) technique and scanning transmission electron microscopy(STEM). The results showed that due to the addition of Zr the exfoliation corrosion resistance of Al-Zn-Mg-Mn alloy sheet is significantly improved, correspondingly, the maximum corrosion depth decreases from 593 μm to 421 μm and the exfoliation corrosion rating changes from EB to EA. The relevant mechanism was discussed based on the difference of grain structure and the changes of the size, spacing and microchemistry of η precipitates at grain boundaries and the width of precipitate free zone.
作者
柴文茹
陈景超
刘胜胆
叶凌英
林化强
张新明
CHAI Wenru;CHEN Jingchao;LIU Shengdan;YE Lingying;LIN Huaqiang;ZHANG Xinming(School of Materials Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China;Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center,Central South University, Changsha 410083, China;National Engineering Research Center for High-speed EMU, CRRC Qingdao Sifang Co. Ltd., Qingdao 266000,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2019年第7期488-496,共9页
Chinese Journal of Materials Research
基金
国家重点研发计划项目(2016YFB0300901)
湖南省科技重大专项(2016GK1004)
中南大学升华育英计划(20130603)~~
