Corrosion and Discharge Behaviors of Mg-Al-Zn and Mg-Al-Zn-In Alloys as Anode MaterialsReport as inadecuate




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1

Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

2

University of Chinese Academy of Sciences, Beijing 100049, China

3

Electric Power Research Institute, Zhejiang Power Corporation, State Grid Corporation of China, Hangzhou 310000, China





*

Authors to whom correspondence should be addressed.



Academic Editor: Hugo F. Lopez

Abstract The Mg-6%Al-3%Zn and Mg-6%Al-3%Zn-1%, 1.5%, 2%In alloys were prepared by melting and casting. Their microstructures were investigated via metallographic and energy-dispersive X-ray spectroscopy EDS analysis. Moreover, hydrogen evolution and electrochemical tests were carried out in 3.5 wt% NaCl solution aiming at identifying their corrosion mechanisms and discharge behaviors. The results suggested that indium exerts an improvement on both the corrosion rate and the discharge activity of Mg-Al-Zn alloy via the effects of grain refining, β-Mg17Al12 precipitation, dissolving-reprecipitation, and self-peeling. The Mg-6%Al-3%Zn-1.5%In alloy with the highest corrosion rate at free corrosion potential did not perform desirable discharge activity indicating that the barrier effect caused by the β-Mg17Al12 phase would have been enhanced under the conditions of anodic polarization. The Mg-6%Al-3%Zn-1.0%In alloy with a relative low corrosion rate and a high discharge activity is a promising anode material for both cathodic protection and chemical power source applications. View Full-Text

Keywords: AZ63; magnesium; discharge behavior; corrosion; indium AZ63; magnesium; discharge behavior; corrosion; indium





Author: Jiarun Li 1,2, Kai Wan 1, Quantong Jiang 1, Huyuan Sun 1,* , Yantao Li 1,* , Baorong Hou 1, Liwei Zhu 3 and Min Liu 3

Source: http://mdpi.com/



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