Effect of Al Content on Corrosion and Discharge Properties of Extruded Mg-Al-Ca-Mn Alloys as Anode Material for Mg-air Batteries

doi:10.11901/1005.3093.2024.409

Chinese Journal of Materials Research

2025, Vol. 39

Issue (5): 389-400 DOI: 10.11901/1005.3093.2024.409

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Effect of Al Content on Corrosion and Discharge Properties of Extruded Mg-Al-Ca-Mn Alloys as Anode Material for Mg-air Batteries

QIU Wei, LI Yulin, YAN Rui, LI Yawen, CHEN Wei, GAN Lang(

), REN Yanjie, CHEN Jian

School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China

Cite this article:

QIU Wei, LI Yulin, YAN Rui, LI Yawen, CHEN Wei, GAN Lang, REN Yanjie, CHEN Jian. Effect of Al Content on Corrosion and Discharge Properties of Extruded Mg-Al-Ca-Mn Alloys as Anode Material for Mg-air Batteries. Chinese Journal of Materials Research, 2025, 39(5): 389-400.

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Abstract

The effect of Al content on the corrosion behavior and electrochemical performance of extruded Mg-Al-Ca-Mn alloy in 3.5%NaCl electrolyte was investigated. The results show that the AMX411 Mg-alloy exhibits excellent corrosion resistance and discharge performance. The measured hydrogen evolution results showed that the minimum hydrogen evolution and mass loss of AMX411 alloy during corrosion process for 72 h were (2.25 ± 0.07) mL·cm^-2 and (2.83 ± 0.12) mg·cm^-2, while the free corrosion potential (φ_corr) and the corrosion current density (J_corr) were -1.267 V and (67.9 ± 0.16) µA·cm^-2 respectively,indicating its low electrochemical activity and best corrosion resistance. In addition, the results of a half-cell discharge test for 4 h revealed that AMX411 alloy maintained a negative and stable voltage regardless of the discharge current densities (5, 10, 20, and 30 mA·cm^-2), and its discharge efficiency was as high as 61.36% and 65.35% at current densities 20 and 30 mA·cm^-2, which was significantly better than that of AMX111 alloy (41.83% and 44.79%). The excellent performance of AMX411 alloy may be attributed to the existence of much smaller and uniformly distributed precipitations of Al-containing second phase, which effectively reduces the local potential difference and suppresses the micro galvanic corrosion effect, thus facilitating the best corrosion resistance, besides, it still exhibits high anode utilization under high current density, which are all favorable advantages for it to become the anode material for Mg-air batteries.

Key words: metallic materials Mg-Al-Ca-Mn alloy Mg-air battery corrosion behavior electrochemical performance

Received: 08 October 2024

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(52171099);Hunan Provincial Department of Education Key Program(22A0240)

Corresponding Authors: GAN Lang, Tel: 15111404604, E-mail: langgan@csust.edu.cn

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	QIU Wei
	LI Yulin
	YAN Rui
	LI Yawen
	CHEN Wei
	GAN Lang
	REN Yanjie
	CHEN Jian

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.409 OR https://www.cjmr.org/EN/Y2025/V39/I5/389

Fig.1 Diagram of the hydrogen precipitation plant by immersion

Fig.2 OM diagram of extruded alloy (a) AMX011, (b) AMX111, (c) AMX211, (d) AMX311, (e) AMX411

Fig.3 SEM diagram of extruded alloy (a) AMX011, (b) AMX111, (c) AMX211, (d) AMX311, (e) AMX411

Fig.4 Hydrogen evolution volume (a) and total mass loss (b) of extruded alloys after immersion in 3.5%NaCl for 72 h

Table 1 Fitting data of potential dynamic polarization curve of extruded alloy

Fig.5 Nyquist (a), Bode (b) plots, and polarization curves (c) of AMX alloy in 3.5%NaCl solution, and equivalent circuit diagrams (d)

Table 2 Fitting the EIS parameters of AMX alloys

Fig.6 Corrosion morphologies of alloys in extruded state with (a1~e1, a2~e2) and without corrosion (a3~e3, a4~e4) products after 3 h (a1~e1, a3~e3) and 24 h (a2~e2, a4~e4) immersion

Fig.7 Schematic corrosion mechanism of AMX alloy in 3.5%NaCl solution for different time

Fig.8 Constant current discharge curve of extruded alloy discharged in 3.5%NaCl for 4 h under the current density of 5 mA·cm^-2 (a), 10 mA·cm^-2 (b), 20 mA·cm^-2 (c), and 30 mA·cm^-2 (d)

Table 3 Average discharge voltage and anode utilization rate of extruded alloy at different current densities for 4 h

Fig.9 Surface morphologies of extruded alloy without removal (a1~e1) and with removal of discharge products (a2~e2, a3~e3) after 4 h discharge at 20 mA·cm^-2 (a) AMX011, (b) AMX111, (c) AMX211, (d) AMX311, (e) AMX411

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