Electrochemical Behavior of Mg-Al-Zn-Ga Alloy as Anode Materials in 3.5 wt.% NaCl Solution
- Chinese Academy of Sciences, Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology (China)
- Luoyang Ship Material Research Institute (LSMRI), State Key Laboratory for Marine Corrosion and Protection (China)
The microstructure and electrochemical behaviors of Mg-Al-Zn and Mg-Al-Zn-Ga alloys as anode materials were investigated by morphology observation, composition analysis, phase identification, and electrochemical tests. The experimental results suggest that Ga alloying can refine the grains of the Mg-Al-Zn alloy by promoting second-phase segregation, which comprises Mg{sub 17}Al{sub 12} and GaMg{sub 2}. The comparison of discharge tests indicates that adding Ga to the Mg-Al-Zn alloy can negatively shift the discharge potential, provide a high current density, promote the formation of tiny and thin products, and improve the utilization efficiency. Meanwhile, the addition of Ga can increase the corrosion resistance of Mg-Al-Zn alloy because the Ga alloying promotes the segregation of the intermetallic phases in the Mg matrix. The intermetallic phases disperse in isolate states in the Mg matrix, resulting in their falling off from the substrate once their adjacent Mg is exhausted and subsequently ceasing the micro-galvanic corrosion. The Mg-Al-Zn-Ga alloy with higher corrosion resistance performs better discharge activity than that of Mg-Al-Zn alloy in 3.5 wt.% NaCl solution, implying that the Mg-Al-Zn-Ga alloy is a promising anode material for seawater-activated battery.
- OSTI ID:
- 22863244
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 27, Issue 10; Conference: EUROMAT 2017: European Congress and Exhibition on Advanced Materials and Processes, Thessaloniki (Greece), 17-22 Sep 2017, AeroMat 2017: Advanced Aerospace Materials and Processes Conference and Exposition, Thessaloniki (Greece), 17-22 Sep 2017; Other Information: Copyright (c) 2018 ASM International; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1059-9495
- Country of Publication:
- United States
- Language:
- English
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