Research on Regulating Corrosion Resistance of Mg-5Zn-0.6Zr Alloy by Friction Stir Processing
LONG Fei1,2, LIU Qu1,2, ZHU Yixing1,2, ZHOU Mengran1,2, CHEN Gaoqiang1,2, SHI Qingyu1,2,*
1 State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China 2 Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China
Abstract: As a lightweight material with sufficient reserves, high specific strength and specific modulus, the application of magnesium is very promising. The poor corrosion resistance of magnesium seriously limits its application, and galvanic corrosion caused by larger precipitates is an important reason for the poor corrosion resistance of magnesium alloys. In this work, the as-cast Mg-5Zn-0.6Zr alloy was selected as the object of study, and this alloy was friction stir processed. The microstructure and electrochemical properties were examined and analyzed before and after friction stir processing (FSP). The results indicated that after processed by FSP, the Mg-5Zn-0.6Zr alloy exhibited a strong (0001) basal texture with low dislocation density in most regions. The grain size was refined from 66.4 μm to the order of 1.6 μm, and there was a certain level of fragmentation and dispersed distribution of the precipitates. In a 3.5%(% refers to the mass fraction, if not otherwise stated) NaCl aqueous solution, the corrosion current density decreased from 38.3 μA/cm2 to 17.0 μA/cm2 at open circuit potential. Moreover, the polarization resistance increased from 48.98 Ω·cm2 to 197.02 Ω·cm2.The study indicated that FSP could effectively improve the corrosion resistance of magnesium alloy.
通讯作者:
*史清宇,清华大学机械工程系教授、博士研究生导师。1993年哈尔滨工业大学金属材料及工艺系本科毕业,1996年哈尔滨工业大学金属材料及工艺系硕士毕业,2000年清华大学机械工程系博士毕业。目前主要从事搅拌摩擦焊接与加工、焊接力学及模拟仿真等方面的研究工作。发表论文100余篇,包括Corrosion Science、Journal of Mage-nesium and Alloys、Scripta Materialia、Composites Part B、 Engineering、 Journal of Alloys and Compounds等。shqy@tsinghua.edu.cn
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2024, Vol. 38 
