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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Influence of Ga and Hg on microstructure and electrochemical corrosion behavior of Mg alloy anode materials
FENG Yan(冯 艳), WANG Ri-chu(王日初), YU Kun(余 琨),PENG Chao-Qun(彭超群), LI Wen-xian(黎文献)

School of Materials Science and Engineering, Central South University,Changsha 410083, China

Abstract: The effects of Hg and Ga on the electrochemical corrosion behavior of Mg-5%Hg (molar fraction) alloys were investigated by the measurement of polarization curves and galvanostatic test. The microstructure of the alloys and the corroded surface of the specimens were investigated by scanning electron microscopy, X-ray diffractometry and emission spectrum analysis. It can be concluded that the addition of 1%Ga (molar fraction) reduces corrosion current density from 26.98 mA/cm2 to 2.34 mA/cm2; while the addition of 1%Hg (molar fraction) increases corrosion current density. The addition of Ga and Hg both promotes the electrochemical activity of the alloys and the influence of Ga is more effective than Hg. Mg-5%Hg-1%Ga alloy has the best electrochemical activity, showing mean potential of −1.992 V. The activation mechanism of the magnesium alloy produced by Hg and Ga was put forward. Magnesium atoms are dissolved in liquid Hg and Ga to form amalgam and undergo severe oxidation at the amalgam/electrolyte interface.

 

Key words: Mg alloy anode; electrochemical measurement; corrosion resistance; activation mechanism

ISSN 1672-7029
CN 43-1423/U

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