模拟液滴电导率变化对碳钢大气腐蚀的影响机制研究

doi:10.11902/1005.4537.2025.061

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1537-1548 CSTR: 32134.14.1005.4537.2025.061 DOI: 10.11902/1005.4537.2025.061

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模拟液滴电导率变化对碳钢大气腐蚀的影响机制研究

李兆南¹, 侯禹岑¹, 莒鹏², 庄铁钢³, 陈景杰¹, 王明昱¹(

), 徐云泽¹^,⁴

1 大连理工大学船舶工程学院大连 116024
2 中海石油(中国)有限公司上海分公司上海 200000
3 中国电建集团华东勘测设计研究院有限公司杭州 310000
4 工业装备结构分析优化与CAE软件全国重点实验室大连 116024

Influence of Simulated Electrolyte Droplets with Varied Conductivity on Atmospheric Corrosion of Carbon Steel

LI Zhaonan¹, HOU Yucen¹, JU Peng², ZHUANG Tiegang³, CHEN Jingjie¹, WANG Mingyu¹(

), XU Yunze¹^,⁴

1 School of Naval Engineering, Dalian University of Technology, Dalian 116024, China
2 China National Offshore Oil Corporation (China) Co. Ltd. , Shanghai Branch, Shanghai 200000, China
3 China Power Construction Corporation East China Survey and Design Institute Co. Ltd. , Hangzhou 310000, China
4 National Key Laboratory of Industrial Equipment Structural Analysis and Optimization and CAE Software, Dalian 116024, China

引用本文:

李兆南, 侯禹岑, 莒鹏, 庄铁钢, 陈景杰, 王明昱, 徐云泽. 模拟液滴电导率变化对碳钢大气腐蚀的影响机制研究[J]. 中国腐蚀与防护学报, 2025, 45(6): 1537-1548.
Zhaonan LI, Yucen HOU, Peng JU, Tiegang ZHUANG, Jingjie CHEN, Mingyu WANG, Yunze XU. Influence of Simulated Electrolyte Droplets with Varied Conductivity on Atmospheric Corrosion of Carbon Steel[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1537-1548.

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摘要:

通过实验室模拟大气中液滴环境，采用丝束电极技术系统地研究了不同电导率液滴下碳钢腐蚀行为的演化规律。实验结果表明，随着腐蚀时间的延长，低电导率液滴下碳钢表面局部阴阳极电流逐渐增强，而高电导率液滴下阴阳极电流逐渐减弱。当液滴内NaCl浓度为0.001 mol/L时，实验初期电极表面阴阳极分布较为随机，而当NaCl浓度超过0.003 mol/L时，电极表面的阴阳极电流分布呈现典型的Evans模型特征。进一步研究表明，液滴电导率的变化会显著影响宏电池电流和微电池电流对总腐蚀速率的作用机制。在低电导率条件下，阴极区域的宏电池电流起到保护作用，能够有效避免腐蚀的发生；而在高电导率条件下，阴极区域在微电池电流的作用下发生了明显的腐蚀。

关键词 ：大气腐蚀, 碳钢, 液滴电导率, 丝束电极

Abstract：

The wire beam electrode technique was systematically employed to investigate the evolution of atmospheric corrosion behavior on carbon steel surfaces under droplets with varying conductivities in laboratory-simulated environments. The experimental results showed that with increasing corrosion time, the local anodic and cathodic currents on the carbon steel surface gradually increased under low-conductivity droplets, while both currents gradually decreased under high-conductivity droplets. When the NaCl concentration inside the droplet was 0.001 mol/L, the anodic and cathodic distributions on the electrode surface appeared relatively random during the initial stage of the experiment. However, when the NaCl concentration exceeded 0.003 mol/L, the distribution of anodic and cathodic currents on the electrode surface exhibited the typical characteristics of the Evans model. Further research revealed that variations in droplet conductivity significantly influenced the mechanisms by which macro-cell and micro-cell currents affected the overall corrosion rate. Under low-conductivity conditions, the macro-cell currents in the cathodic region played a protective role, effectively preventing corrosion. In contrast, under high-conductivity conditions, the cathodic region underwent significant corrosion due to the action of micro-cell currents.

Key words： atmospheric corrosion carbon steel conductivity droplets wire beam electrode

收稿日期: 2025-02-21 32134.14.1005.4537.2025.061

ZTFLH:

TG174

基金资助:国家自然科学基金(52471272)

通讯作者: 王明昱，E-mail：mingyu.w@foxmail.com，研究方向为船舶与海洋结构物腐蚀与防护

Corresponding author: WANG Mingyu, E-mail: mingyu.w@foxmail.com

作者简介: 李兆南，男，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.061 或 https://www.jcscp.org/CN/Y2025/V45/I6/1537

图1 丝束电极实物图及局部电化学测试实验装置示意图

图2 在不同浓度的NaCl溶液中Q355b碳钢的极化曲线

表1 Q355b碳钢在不同浓度的NaCl溶液中极化曲线的拟合电化学参数

图3 不同浓度液滴下腐蚀不同时间后Q355b碳钢表面电流分布云图

图4 不同浓度液滴下腐蚀不同时间后Q355b碳钢表面电位分布图

图5 不同浓度液滴下腐蚀不同时期的丝束表面形貌图和末期电流分布图

图6 不同浓度液滴下总阳极电流分布图

图7 不同浓度液滴下阳极区电偶电流与总阳极电流占比图

图8 不同电导率液滴下金属表面腐蚀机理图

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