Electrochemical Behavior of Mg-Al-Zn-Ga Alloy as Anode Materials in 3.5 wt.% NaCl Solution

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3635-9· OSTI ID:22863244

Li, Jiarun; Ma, Xiumin; Chen, Zhuoyuan; Hou, Baorong ^[1]; Xu, Likun ^[2]

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1. Chinese Academy of Sciences, Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology (China)
2. 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, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 10 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
ANODES
COMPARATIVE EVALUATIONS
CORROSION RESISTANCE
CURRENT DENSITY
EFFICIENCY
ELECTROCHEMICAL CORROSION
ELECTROCHEMISTRY
GALLIUM COMPOUNDS
INTERMETALLIC COMPOUNDS
MAGNESIUM ALLOYS
MICROSTRUCTURE
SEAWATER
SEGREGATION
SUBSTRATES
ZINC COMPOUNDS