Electrochemical Performance of Commercial MB1 and MB8 Mg-alloys in NaCl Solution

doi:10.11902/1005.4537.2023.279

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 1073-1080 DOI: 10.11902/1005.4537.2023.279

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Electrochemical Performance of Commercial MB1 and MB8 Mg-alloys in NaCl Solution

WANG Bo¹, AN Shizhong¹^,²^,³^,⁴(

), GUO Junqing¹(

), JI Yunguang¹, LI Zhiqiang¹

1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
2. Longmen Laboratory, Luoyang 471000, China
3. Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Luoyang 471023, China
4. Henan Key Laboratory of Nonferrous Materials Science and Processing Technology, Luoyang 471023, China

Cite this article:

WANG Bo, AN Shizhong, GUO Junqing, JI Yunguang, LI Zhiqiang. Electrochemical Performance of Commercial MB1 and MB8 Mg-alloys in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1073-1080.

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Abstract

Mg-alloys, as light-weight high-performance materials, have extensive potential applications in various fields. However, in practical use for metal-air batteries, their electrochemical performance is significantly influenced by the composition and condition of the anode material. Therefore, to develop more efficient Mg-air batteries, it is crucial to study the electrochemical performance of commercial Mg-alloys in the presence of different electrolytes. This study focuses on the corrosion and electrochemical performance of extruded MB1 and cast MB8 Mg-alloys in NaCl solutions of varying concentrations in terms of the anode utilization efficiency, discharge voltage, and grain structures. The results indicate that the electrochemical performance of Mg-alloys was improved significantly as the NaCl electrolyte concentration increases. Specifically, with increasing concentration, the anode utilization efficiency was gradually improved, accompanied by higher discharge voltages. When the discharge current density is 10 mA·cm^-2 in 4 mol/L NaCl electrolyte, the peak anode utilization efficiency for cast MB8 and extruded MB1 Mg-alloys reach 41.8% and 38.8%, respectively. The extruded MB1 alloy, due to its finer grain structure, exhibits higher activity, slightly higher and more stable discharge voltage in comparison with the cast MB8 alloy. Besides, the cast MB8 alloy has relatively coarser grains, but it has a lower self-corrosion rate and higher anode utilization efficiency. In sum, the extruded MB1 alloy shows higher activity, while the cast MB8 alloy exhibits superior corrosion resistance. These findings offer useful guidance for the future development of Mg-air batteries and are expected to further advance the application of Mg-alloys in the field of energy storage.

Key words: magnesium-air battery self-corrosion rate electrochemical property discharge performance processing technology

Received: 07 September 2023 32134.14.1005.4537.2023.279

ZTFLH:

TM911

Fund: Key Research and Promotion Project in Henan Province(232102231019)

Corresponding Authors: AN Shizhong, E-mail: anshizhong@sina.com;

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.279 OR https://www.jcscp.org/EN/Y2024/V44/I4/1073

Table 1 Chemical compositions of commercial extruded MB1 and as-cast MB8 magnesium alloys

Fig.1 Microstructures of extruded MB1 (a) and as-cast MB8 (b) Mg-based alloys

Fig.2 Tafel curves of extruded MB1 (a) and as-cast MB8 (b) Mg-based alloys in NaCl solutions with different concentrations

Table 2 Fitting data of Tafel curves of extruded MB1 and as-cast MB8 Mg-based alloys in NaCl solutions with different concentrations

Fig.3 Nyquist (a, b) plots of extruded MB1 (a) and as-cast MB8 (b) Mg-based alloys in NaCl solutions with different concentrations, and corresponding equivalent circuit (c)

Table 3 Fitting electrochemical parameters of Nyquist plots of extruded MB1 and as-cast MB8 Mg-based alloys in NaCl solutions

Fig.4 Self-corrosion rate (a) and hydrogen evolution rate (b) of extruded MB1 and as-cast MB8 Mg-based alloys in the electrolytes with different NaCl concentrations

Fig.5 Discharge curves of Mg-air batteries with different concentrations of NaCl electrolyte at the current density of 10 mA·cm^-2: (a) extruded MB1, (b) as-cast MB8

Fig.6 Anode utilization efficiency (a) and capacity density (b) of extruded MB1 and as-cast MB8 Mg-based alloys in NaCl solutions with different concentrations

Fig.7 Corrosion morphologies of extruded MB1 (a-d) and as-cast MB8 (e-h) Mg-based alloys in the solutions containing 0.6 mol/L (a, e), 1 mol/L (b, f), 2 mol/L (c, g) and 4 mol/L (d, h) NaCl at the current density of 10 mA·cm^-2

Fig.8 Corrosion morphologies of extruded MB1 (a-d) and as-cast MB8 (e-h) Mg-based alloys after removal of the corrosion products in the solutions containing 0.6 mol/L (a, e), 1 mol/L (b, f), 2 mol/L (c, g) and 4 mol/L (d, h) NaCl at the current density of 10 mA·cm^-2

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