期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 57, 期 -, 页码 138-145出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.03.046
关键词
Mg-Li alloy; Negative difference effect; Electrochemical property; Corrosion; Anodic dissolution
资金
- NationalKey Research and Development Program of China [2017YFB0702001, 2016YFB0301105]
- National Natural Science Foundation of China Projects [51901047, 51871211, 51701129]
- Doctor Startup Fund of Natural Science Foundation Program of Liaoning Province [2019-BS-200]
- StrategicNew Industry Development Special Foundation of Shenzhen [JCYJ20170306141749970]
- Funds of International Joint Laboratory for Light Alloys
- Liaoning BaiQianWan Talents Program
- Domain Foundation of Equipment Advance Research of 13thFiveyear Plan [61409220118]
- Innovation Fund of Instituteof Metal Research (IMR), Chinese Academy of Sciences (CAS)
- National Basic Research Program of China [2013CB632205]
The so-called 'negative difference effect' (NDE) was often defined by the increasing rate of hydrogen evolution from magnesium (Mg) surface under anodic polarization. In this work, a series of electrochemical tests and microstructure observations were performed to provide an evidence that the NDE of Mg-Li alloys can be retarded by increasing lithium content. Potentiostatic, galvanostatic and potentiodynamic polarization experiments using Mg-xLi (x = 4, 7.5 and 14 wt%) alloys electrodes indicated that Mg-4Li alloy maintained the enhancing NDE prior to anodic dissolution as that of conventional Mg alloys. However, the emergence of beta-Li phase weakened the NDE of duplex Mg-7.5Li alloy at a low anodic current density, but it was still enhanced apparently after a high applied anodic value (more than 2 mA/cm(2)). The surface observations, including the plane and cross-sectional morphologies, confirmed that the cracked surface film derived from the anodic dissolution resulted in the catalytic activity of NDE for Mg-4Li and Mg-7.5Li alloys. Furthermore, the NDE of Mg-14Li alloy was suppressed obviously after a prior applied anodic polarization, which was attributed to the persistent and integrated surface film which endured a higher level of applied anodic potential and current. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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