平行磁场下顺磁性镧铁硅基磁热合金的微电偶腐蚀行为

doi:10.11902/1005.4537.2025.076

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1748-1754 CSTR: 32134.14.1005.4537.2025.076 DOI: 10.11902/1005.4537.2025.076

研究报告

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平行磁场下顺磁性镧铁硅基磁热合金的微电偶腐蚀行为

王海洋¹, 林川弘昕¹, 郭丽雅¹^,²(

)

1 上海大学材料科学与工程学院上海 200444
2 上海大学(浙江)高端装备基础件材料研究院嘉兴 314113

Micro-galvanic Corrosion Behavior of Paramagnetic La-Fe-Si Magnetocaloric Alloy Under Parallel Magnetic Fields

WANG Haiyang¹, LIN Chuanhongxin¹, GUO Liya¹^,²(

)

1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2 Zhejiang Institute of Advanced Materials, Shanghai University, Jiaxing 314113, China

引用本文:

王海洋, 林川弘昕, 郭丽雅. 平行磁场下顺磁性镧铁硅基磁热合金的微电偶腐蚀行为[J]. 中国腐蚀与防护学报, 2025, 45(6): 1748-1754.
Haiyang WANG, Chuanhongxin LIN, Liya GUO. Micro-galvanic Corrosion Behavior of Paramagnetic La-Fe-Si Magnetocaloric Alloy Under Parallel Magnetic Fields[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1748-1754.

全文: PDF(5034 KB) HTML

摘要:

采用电化学腐蚀和浸泡腐蚀实验，结合扫描电镜等，研究了平行磁场下顺磁性镧铁硅基磁热合金在0.1 mol/L NaClO₄溶液中的微电偶腐蚀行为。实验结果表明，施加平行磁场后，La-Fe和La-LaFe_13.9Si_1.4电偶对的电流密度增大，而LaFe_13.9Si_1.4-Fe电偶对的电流密度减小。电化学阻抗谱和动电位极化测试表明，平行磁场能降低La-LaFe_13.9Si_1.4材料的腐蚀速率。浸泡实验结果表明，施加平行磁场后，材料腐蚀程度较低，腐蚀坑小且数量少，无明显腐蚀产物。以上实验结果主要是由于液体中磁流体动力的搅拌作用导致。

关键词 ：磁热合金, 平行磁场, 微电偶腐蚀

Abstract：

The galvanic corrosion behavior of paramagnetic La-Fe-Si-based magnetocaloric alloys in 0.1 mol/L NaClO₄ solution under a parallel magnetic field was investigated via static immersion test, scanning electron microscopy and other techniques. The results indicate that the application of a parallel magnetic field increased the corrosion current density of the galvanic couple La-Fe and La-LaFe_13.9Si_1.4, decreased the corrosion current density of the galvanic couple La-LaFe_13.9Si_1.4. Electrochemical impedance spectroscopy and potentiodynamic polarization tests demonstrate that the parallel magnetic field can reduce the corrosion rate of La-LaFe_13.9Si_1.4. Immersion test results show that, compared with the absence of magnetic fields, the corrosion was less severe in the presence of a parallel magnetic field, with smaller and fewer corrosion pits and no obvious corrosion products. The above results were mainly ascribed to the stirring effects for the fluids caused by magnetohydrodynamic forces.

Key words： magnetocaloric alloys parallel magnetic field micro-galvanic corrosion

收稿日期: 2025-03-05 32134.14.1005.4537.2025.076

ZTFLH:

TG174

基金资助:国家自然科学基金(52201078);国家自然科学基金(42276214)

通讯作者: 郭丽雅，E-mail：liya_guo@shu.edu.cn，研究方向为金属的腐蚀与防护

Corresponding author: GUO Liya, E-mail: liya_guo@shu.edu.cn

作者简介: 王海洋，男，1999年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.076 或 https://www.jcscp.org/CN/Y2025/V45/I6/1748

图1 三电极电化学实验和零电阻安培计实验工作原理图以及平行磁场方向的定义

图2 LaFe13.9Si1.4、Fe 和 La 的SEM背散射电子像及EDS分析

图3 含La(Fe, Si)13相、α-Fe、富La相的LaFe13.9Si1.4磁热合金的X射线衍射图谱

图4 无磁场和1 T平行磁场下LaFe13.9Si1.4磁热合金在0.1 mol/L NaClO4溶液中的Nyquist图和动电位极化曲线及等效电路

表1 LaFe13.9Si1.4磁热合金在0.1 mol/L NaClO4溶液中的电化学阻抗谱拟合数据

图5 无磁场和1 T平行磁场下LaFe13.9Si1.4磁热合金样标定区域在0.1 mol/L NaClO4溶液中浸泡1 h前后的表面形貌

图6 无磁场和1 T平行磁场下不同电偶对在0.1 mol/L NaClO4溶液中浸泡1 h后的ZRA结果

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