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Metals 2016, 6(3), 65;

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

Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
University of Chinese Academy of Sciences, Beijing 100049, China
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
Received: 29 January 2016 / Revised: 16 February 2016 / Accepted: 4 March 2016 / Published: 17 March 2016
(This article belongs to the Special Issue Oxidation of Metals)
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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

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Li, J.; Wan, K.; Jiang, Q.; Sun, H.; Li, Y.; Hou, B.; Zhu, L.; Liu, M. Corrosion and Discharge Behaviors of Mg-Al-Zn and Mg-Al-Zn-In Alloys as Anode Materials. Metals 2016, 6, 65.

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