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材料工程  2020, Vol. 48 Issue (10): 17-27    DOI: 10.11868/j.issn.1001-4381.2019.001078
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金属镁电化学腐蚀阳极析氢行为研究进展
刘玉项1, 朱胜1, 韩冰源1,2
1. 陆军装甲兵学院 装备再制造技术国防科技重点实验室, 北京 100072;
2. 江苏理工学院 汽车与交通工程学院, 江苏 常州 213001
Research progress in anodic hydrogen evolution of magnesium electrochemistry corrosion
LIU Yu-xiang1, ZHU Sheng1, HAN Bing-yuan1,2
1. National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China;
2. School of Automobile and Traffic Engineering, Jiangsu University of Technology, Changzhou 213001, Jiangsu, China
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摘要 金属镁在水溶液中的阳极极化行为与金属腐蚀电化学理论相悖,表现出阳极析氢行为,而且析出的氢气量随着阳极极化电压的升高而增大。这种被称为"负差数效应"的现象一直是金属镁腐蚀电化学研究的热点。本文首先详述了"负差数效应"的内涵和本质,随后综述了揭示"负差数效应"机理的假设和理论,最后分析了当前的假设和理论存在的有关假设无法实验验证、理论无法自洽等问题。指出了未来研究的侧重点是通过原位电化学技术、修正电化学参数等方向上揭示阳极析氢行为的机理,以期完善金属腐蚀理论。
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刘玉项
朱胜
韩冰源
关键词 金属镁腐蚀电化学阳极析氢负差数效应    
Abstract:High chemical activity and unique electrochemical behaviour are responsible for the complicated corrosion mechanism of magnesium. Importantly, the anodic hydrogen evolution on Mg electrodes when applied anodic polarization is one of the greatest important characteristics for Mg corrosion. The phenomenon, referred to as negative difference effect (NDE), has always been of an interest in terms of Mg electrochemistry corrosion. In this article, the research progress of hypotheses and theories proposed to interpret this phenomenon was reviewed: assuming that univalent Mg+ existed during anodic polarization of Mg. According to this, increasing oxidation rate of magnesium by applying an anodic polarization increased the rate of hydrogen evolution since the rate of Mg+ entering into electrolyte increased at the same time. However, this theory has raised criticism since Mg+ has never been experimentally detected, despite the requirement of its finite lifetime. Film theory declared that the dark corrosion products containing bilayer of MgO and Mg(OH)2 films form on the corroded surface of magnesium were believed to exhibit enhanced catalytic activity towards hydrogen evolution as well. In addition, this declaration has been proved experimentally: hydrogen evolution rate on the dark corroded regions was faster than that on the uncorroded regions at free corrosion, especially at the boundaries of the corroded/uncorroded regions. However, the latest experiments demonstrated that the increase in cathodic activity of the corroded regions during anodic polarization provided a minor contribution to the increase in hydrogen evolution rate during anodic polarization, and rather the enhanced hydrogen evolution at anodic potentials (NDE) was dominated by the regions where the net anodic reaction occurred. Assuming that enrichment of impurities such as Fe and Mg atoms took place in corrosion products of Mg. It is believed that Fe enrichment was capable of enhancing catalytic activity towards hydrogen evolution. There were indeed evidences (microscope images) showing the enrichment of Fe atoms around the interface of metal/solution. Unfortunately, the accumulation of these atoms on the electrode only contributed to a very small part to hydrogen evolution in NDE in further studies. Further, some researchers asserted the great possibility of the existence of MgH2 which had a similar mechanism of NDE to univalent Mg+. Still, the experimental existence and stability of such intermediate agents were of great concern. Another study proposed a theory that H2O molecules were always of absorption and desorption on Mg electrode, which provided sufficient H atoms for NDE to take place. Though all these assumptions contributed to explaining the NDE phenomenon to some extent, they were still not so reasonable to be generally accepted. At last, it was pointed that the future development direction of the NDE phenomenon by using advanced in-situ electrochemistry techniques and adjusting the electrochemical parameters, to expect a reasonable NDE mechanism, further to develop the corrosion theory of metals.
Key wordsmagnesium    electrochemistry corrosion    anodic hydrogen evolution    negative difference eff-ect
收稿日期: 2019-11-19      出版日期: 2020-10-17
中图分类号:  O646.6  
通讯作者: 朱胜(1964-),男,研究员,博士,研究方向:增材制造,装备再制造技术,联系地址:北京市丰台区杜家坎21号院(100072),E-mail:zusg@sina.com     E-mail: zusg@sina.com
引用本文:   
刘玉项, 朱胜, 韩冰源. 金属镁电化学腐蚀阳极析氢行为研究进展[J]. 材料工程, 2020, 48(10): 17-27.
LIU Yu-xiang, ZHU Sheng, HAN Bing-yuan. Research progress in anodic hydrogen evolution of magnesium electrochemistry corrosion. Journal of Materials Engineering, 2020, 48(10): 17-27.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001078      或      http://jme.biam.ac.cn/CN/Y2020/V48/I10/17
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