二次相诱发铝空气电池纯铝阳极局部腐蚀研究

张博威; 王禾祖; 苏艳; 杨文广; 郝雪龙; 张泽群; 汪凤琴; 薛伟; 吴俊升

doi:10.1007/s12613-022-2533-1

Volume 30 Issue 5

May 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(5): 977-987

Bowei Zhang, Hezu Wang, Yan Su, Wenguang Yang, Xuelong Hao, Zequn Zhang, Fengqin Wang, Wei Xue, and Junsheng Wu, Secondary phase precipitate-induced localized corrosion of pure aluminum anode for aluminum–air battery, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 977-987. https://doi.org/10.1007/s12613-022-2533-1

Cite this article as:

Bowei Zhang, Hezu Wang, Yan Su, Wenguang Yang, Xuelong Hao, Zequn Zhang, Fengqin Wang, Wei Xue, and Junsheng Wu, Secondary phase precipitate-induced localized corrosion of pure aluminum anode for aluminum–air battery, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 977-987. https://doi.org/10.1007/s12613-022-2533-1

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研究论文

二次相诱发铝空气电池纯铝阳极局部腐蚀研究

1)
北京科技大学新材料技术研究院，北京 100083，中国
2)
西南技术工程研究所，重庆 400039，中国
3)
国标(北京)检验认证有限公司国家有色金属及电子材料分析测试中心，北京 101407，中国

通讯作者:
张博威 E-mail: bwzhang@ustb.edu.cn

吴俊升 E-mail: wujs@ustb.edu.cn

文章亮点

(1) 系统地研究了纯铝阳极中二次相及附近区域的原位局部腐蚀演化。

(2) 利用有限元模拟对二次相在腐蚀进程中的电流密度分布进行了探究。

(3) 建立了由二次相引发的纯铝在碱性介质中早期局部腐蚀机制。

中文摘要

铝空气电池由于铝阳极储量丰富、环保经济、配置简单、能量密度高等优势在能源领域显示出巨大的应用潜力。然而铝阳极在碱性电解质中的严重腐蚀大大限制了铝空气电池的实际应用，且有关铝阳极中二次相对腐蚀行为影响的报道很少。本文选用4种不同纯度的纯铝，并采用微观结构表征、电化学测试、原位腐蚀形貌观察、有限元模拟等手段，系统的探究了中二次相对纯铝阳极在碱性介质中局部腐蚀的影响。结果表明：纯铝中存在分布在晶内的团簇相及沿晶界分布的线条状析出相两种二次相，纯铝中的Al–Fe二次相几乎不溶于碱性溶液且在腐蚀过程中充当阴极相，在电偶作用的影响下导致其周围基体发生腐蚀。低纯度铝样品由于晶粒内和晶界处的大量二次相引起的强烈电偶腐蚀而遭受严重的腐蚀。相比之下，高纯铝样品由于二次相尺寸较小且含量较低，腐蚀现象较为轻微。准原位SEM观察表明，铝基体的快速溶解进一步促进了二次相的暴露及脱落。此外，基于有限元模型的模拟电流密度分布表明，二次相加速了团簇相及周围基体的腐蚀速率。本文深入研究了二次相在碱性介质中对纯铝腐蚀的影响，为铝空气电池阳极材料的设计提供了参考。

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Research Article

Secondary phase precipitate-induced localized corrosion of pure aluminum anode for aluminum–air battery

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Abstract

Abstract

Understanding the influence of purities on the electrochemical performance of pure aluminum (Al) in alkaline media for Al–air batteries is significant. Herein, we comprehensively investigate secondary phase precipitate (SPP)-induced localized corrosion of pure Al inNaOH solution mainly based on quasi-in-situ and cross-section observations under scanning electron microscopy coupled with finite element simulation. The experimental results indicate that Al–Fe SPPs appear as clusters and are coherent with the Al substrate. In alkaline media, Al–Fe SPPs exhibit more positive potentials than the substrate, thus aggravating localized galvanic corrosion as cathodic phases. Moreover, finite element simulation indicates that the irregular geometry coupled with potential difference produces the non-uniform current density distribution inside the SPP cluster, and the current density on the Al substrate gradually decreases with distance.
- aluminum;
- secondary phase precipitates;
- cluster;
- corrosion;
- alkaline

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