Influence of Ga and Hg on microstructure and electrochemical corrosion behavior of Mg alloy anode materials
(0) 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.
Mg alloy anode electrochemical measurement corrosion resistance activation mechanism
FENG Yan WANG Ri-chu YU Kun PENG Chao-Qun LI Wen-xian
School of Materials Science and Engineering,Central South University,Changsha 410083,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）