商用MB1和MB8镁合金在NaCl溶液中的电化学性能

doi:10.11902/1005.4537.2023.279

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 1073-1080 CSTR: 32134.14.1005.4537.2023.279 DOI: 10.11902/1005.4537.2023.279

轻质合金腐蚀与防护专栏

本期目录 | 过刊浏览

商用MB1和MB8镁合金在NaCl溶液中的电化学性能

王博¹, 安士忠¹^,²^,³^,⁴(

), 郭俊卿¹(

), 纪运广¹, 李志强¹

1.河南科技大学材料科学与工程学院洛阳 471023
2.龙门实验室洛阳 471000
3.省部共建有色金属新材料与先进加工技术协同创新中心洛阳 471023
4.河南省有色金属材料科学与加工技术重点实验室洛阳 471023

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

引用本文:

王博, 安士忠, 郭俊卿, 纪运广, 李志强. 商用MB1和MB8镁合金在NaCl溶液中的电化学性能[J]. 中国腐蚀与防护学报, 2024, 44(4): 1073-1080.
Bo WANG, Shizhong AN, Junqing GUO, Yunguang JI, Zhiqiang LI. Electrochemical Performance of Commercial MB1 and MB8 Mg-alloys in NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1073-1080.

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摘要:

研究了挤压态MB1和铸态MB8镁合金在不同浓度NaCl溶液中的腐蚀和电化学性能。结果表明，随着NaCl电解液浓度升高，镁合金的阳极利用效率不断升高，放电电压更高。放电电流密度为10 mA·cm^-2时，铸态MB8和挤压态MB1镁合金的阳极利用效率在4 mol/L的NaCl电解液中最高，分别为41.8%和38.8%。得益于更细的晶粒，挤压态MB1合金表现出更高的活性，放电电压比铸态MB8合金略高一些，且放电电压更稳定。铸态MB8合金晶粒相对较粗大，但自腐蚀速率更低、阳极利用效率更高。

关键词 ：镁空气电池, 自腐蚀速率, 电化学性能, 放电性能, 加工工艺

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

收稿日期: 2023-09-07 32134.14.1005.4537.2023.279

ZTFLH:

TM911

基金资助:河南省重点研发与推广专项(232102231019)

通讯作者: 安士忠，E-mail:anshizhong@sina.com，研究方向为磁、电及电化学功能材料;
郭俊卿，E-mail: hkdgjq@163.com，研究方向为金属精密塑性成形理论

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

作者简介: 王博，男，1998年生，硕士生

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表1 商用挤压态MB1和铸态MB8镁合金的成分 (mass fraction / %)

图1 挤压态MB1和铸态MB8镁合金的金相组织

图2 挤压态MB1和铸态MB8镁合金在不同浓度NaCl溶液中的Tafel曲线

表2 挤压态MB1和铸态MB8镁合金在不同浓度NaCl溶液中的Tafel曲线拟合数据

图3 挤压态MB1和铸态MB8镁合金在不同浓度NaCl溶液中的Nyquist图及等效电路

表3 挤压态MB1和铸态MB8镁合金在NaCl溶液中等效电路图的拟合数据

图4 挤压态MB1和铸态MB8镁合金在不同浓度电解液中的自腐蚀速率和析氢速率

图5 不同浓度NaCl电解液镁空气电池在10 mA·cm-2电流密度下的放电曲线

图6 挤压态MB1和铸态MB8镁合金在不同浓度的NaCl溶液中的阳极利用率和容量密度

图7 镁合金在10 mA·cm-2放电电流密度下不同浓度NaCl电解液中放电5 h后的腐蚀形貌

图8 镁合金在10 mA·cm-2放电电流密度下不同浓度NaCl电解液中放电5 h后去除腐蚀产物后的腐蚀形貌

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