<strong>Al</strong>对镁空气电池用挤压态<strong>Mg-Al-Ca-Mn</strong>合金阳极腐蚀和放电性能的影响

doi:10.11901/1005.3093.2024.409

材料研究学报

2025, Vol. 39

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

研究论文

本期目录 | 过刊浏览

Al对镁空气电池用挤压态Mg-Al-Ca-Mn合金阳极腐蚀和放电性能的影响

邱玮, 李玉林, 闫瑞, 李雅文, 陈维, 甘浪(

), 任延杰, 陈荐

长沙理工大学能源与动力工程学院长沙 410114

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

引用本文:

邱玮, 李玉林, 闫瑞, 李雅文, 陈维, 甘浪, 任延杰, 陈荐. Al对镁空气电池用挤压态Mg-Al-Ca-Mn合金阳极腐蚀和放电性能的影响[J]. 材料研究学报, 2025, 39(5): 389-400.
Wei QIU, Yulin LI, Rui YAN, Yawen LI, Wei CHEN, Lang GAN, Yanjie REN, Jian CHEN. Effect of Al Content on Corrosion and Discharge Properties of Extruded Mg-Al-Ca-Mn Alloys as Anode Material for Mg-air Batteries[J]. Chinese Journal of Materials Research, 2025, 39(5): 389-400.

全文: PDF(32296 KB) HTML

摘要:

研究了Al含量对镁空气电池用Mg-Al-Ca-Mn合金挤压态阳极在3.5%NaCl电解液中腐蚀和电化学性能的影响。结果表明，AMX411合金阳极表现出优异的耐腐蚀性和放电性能。AMX411合金的72 h析氢测试结果表明，其最小的析氢量和质量损失分别为(2.25 ± 0.07) mL·cm^-2和(2.83 ± 0.12) mg·cm^-2；AMX411合金的腐蚀电位(φ_corr)和腐蚀电流密度(J_corr)分别为-1.267 V和(67.9 ± 0.16) µA·cm^-2，表明其具有较小的电化学活性和最佳的耐腐蚀性能。随着Al含量的提高含Al第二相的分布逐渐均匀，其在3.5%NaCl溶液中由区域性腐蚀转变为均匀腐蚀，表明耐蚀性提高了。Nyquist图中的高频容抗环最大表明其电荷转移电阻最大，可抑制腐蚀过程中的点蚀。同时，AMX411合金Bode图中的模峰值和相位角峰值最高，进一步表明其耐蚀性优异。同时，合金电极的4 h放电结果表明，在电流密度分别为5、10、20和30 mA·cm^-2条件下这种合金电极都保持着较负且稳定的电压，并且在放电电流密度分别为20和30 mA·cm^-2条件下其放电效率高达61.36%和65.35%，显著优于AMX111合金电极的41.83%和44.79%。在高电流密度条件下这种合金阳极的利用率较高。AMX411合金优异的性能源于其内部的Al第二相较小且均匀分布，降低了局部电势差和抑制了微电偶腐蚀效应。

关键词 ：金属材料, Mg-Al-Ca-Mn合金, 镁空气电池, 腐蚀行为, 电化学性能

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

收稿日期: 2024-10-08

ZTFLH:

TG146.2

基金资助:国家自然科学基金(52171099);湖南省教育厅重点项目(22A0240)

通讯作者: 甘浪，langgan@csust.edu.cn，研究方向为金属材料

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

作者简介: 邱玮，男，1979年生，教授，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.409 或 https://www.cjmr.org/CN/Y2025/V39/I5/389

图1 浸泡析氢装置

图2 挤压态合金的OM图

图3 挤压态合金的SEM形貌

图4 AMX合金在3.5%NaCl中浸泡72 h后析氢量-时间曲线和质量损失

表1 挤压态合金动电位极化曲线拟合数据

图5 AMX合金在3.5%NaCl溶液中的电化学阻抗谱、极化曲线和等效电路

表2 拟合AMX合金的EIS参数

图6 挤压态合金分别浸泡3和24 h后以及去除腐蚀产物后的形貌

图7 AMX合金浸泡在3.5%NaCl溶液中不同时间后的腐蚀机理示意图

图8 挤压态合金浸泡在3.5%NaCl中不同电流密度放电4 h的恒电流放电曲线

表3 挤压态合金在不同电流密度下放电4 h的平均放电电压和阳极利用率

图9 挤压态合金在电流密度为20 mA·cm-2条件下放电4 h后以及去除放电产物的表面形貌

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