在役环境磁场对<strong>L360</strong>管线钢及焊接接头腐蚀行为的影响

doi:10.11902/1005.4537.2023.170

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 471-479 CSTR: 32134.14.1005.4537.2023.170 DOI: 10.11902/1005.4537.2023.170

研究报告

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在役环境磁场对L360管线钢及焊接接头腐蚀行为的影响

邓志彬¹^,², 胡枭¹^,³, 刘应彦¹, 岳航⁴, 张千¹, 汤海平¹^,², 鲁锐³(

)

^1.中国民用航空飞行学院民航安全工程学院广汉 618307
^2.民机火灾科学与安全工程四川省重点实验室广汉 618307
^3.中国民用航空飞行学院航空油料管理处广汉 618307
^4.中国石油天然气股份有限公司云南销售分公司昆明 650000

Effect of Magnetic Field on Corrosion Behavior of L360 Pipeline Steel and Welded Joints in 3.5%NaCl Solution

DENG Zhibin¹^,², HU Xiao¹^,³, LIU Yingyan¹, YUE Hang⁴, ZHANG Qian¹, TANG Haiping¹^,², LU Rui³(

)

^1.College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Guanghan 618307, China
^2.Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province, Guanghan 618307, China
^3.Aviation Fuel Management Division, Civil Aviation Flight University of China, Guanghan 618307, China
^4.PetroChina Yunnan Marketing Company, Kunming 650000, China

引用本文:

邓志彬, 胡枭, 刘应彦, 岳航, 张千, 汤海平, 鲁锐. 在役环境磁场对L360管线钢及焊接接头腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2024, 44(2): 471-479.
Zhibin DENG, Xiao HU, Yingyan LIU, Hang YUE, Qian ZHANG, Haiping TANG, Rui LU. Effect of Magnetic Field on Corrosion Behavior of L360 Pipeline Steel and Welded Joints in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 471-479.

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摘要:

为明确磁场对L360输油管道腐蚀行为的影响，通过电化学测试及腐蚀形貌观察等手段，研究了L360管线钢母材及其焊接接头在不同强度磁场作用下3.5%NaCl溶液中的腐蚀行为。结果表明：随着磁场强度的增大，L360管线钢母材及其焊接接头的电荷转移电阻先增大后减小，腐蚀电流密度先减小后增大，较低强度磁场(60 mT)抑制了腐蚀，而较高强度磁场(120 mT)加速了腐蚀。相同磁场强度下，焊接接头腐蚀速率大于母材。机理分析表明：磁场作用力诱导金属离子吸附于电极界面，形成腐蚀产物膜阻碍腐蚀进行；高强度磁场作用下，Lorentz力能够破坏腐蚀产物膜，加速离子扩散，进而加速金属腐蚀。

关键词 ：磁场, L360管线钢, 焊接接头, 3.5%NaCl溶液, 腐蚀行为

Abstract：

To clarify the influence of magnetic fields on the corrosion behavior of oil pipelines of L360 steel in service, the corrosion behavior of L360 pipeline steel and its welded joints in 3.5%NaCl solution by applied magnetic field of various intensities was studied via electrochemical tests and corrosion morphology characterization. The results indicate that as the magnetic field intensity increases, the charge transfer resistance of L360 pipeline steel and its welded joints initially increases and then decreases, while the corrosion current density initially decreases and then increases. Corrosion is inhibited by a lower intensity magnetic field (60 mT), while it is accelerated by a higher intensity magnetic field (120 mT). Moreover, by the same applied magnetic field intensity, the corrosion rate of the welded joints is higher than that of the base metal. It is proposed that the existed gradient magnetic field force may be favor the adsorption of metal ions at the electrode interface, resulting in the formation of a corrosion product film that hinders the corrosion process. Under the influence of a high-intensity magnetic field, the Lorentz force can disrupt the corrosion product film, accelerating ion diffusion and subsequently accelerating the corrosion of the steel.

Key words： magnetic field L360 pipeline steel welded joint 3.5%NaCl solution corrosion behavior

收稿日期: 2023-05-22 32134.14.1005.4537.2023.170

ZTFLH:

TE988

基金资助:中央高校基本科研业务费专项(J2020-124)

通讯作者: 鲁锐，E-mail: 95555846@qq.com，研究方向为航空油料安全管理

Corresponding author: LU Rui, E-mail: 95555846@qq.com

作者简介: 邓志彬，男，1984年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.170 或 https://www.jcscp.org/CN/Y2024/V44/I2/471

图1 实验装置图

图2 不同磁场强度下L360管线钢母材及焊接接头在3.5%NaCl水溶液中的极化曲线

表1 极化曲线拟合参数

图3 不同磁场强度下L360管线钢母材及焊接接头在3.5%NaCl水溶液中的腐蚀速率

图4 不同磁场强度下L360管线钢母材及焊接接头的电化学阻抗谱

图5 等效电路图

表2 电化学阻抗谱的拟合参数

图6 不同磁场强度下L360管线钢母材及焊接接头试样宏观腐蚀形貌

图7 不同磁场强度下L360管线钢母材及焊接接头试样去除腐蚀产物后的宏观形貌

图8 不同磁场强度下L360管线钢母材及焊接接头试样去除腐蚀产物前的微观形貌

图9 不同磁场强度下L360管线钢母材及焊接接头试样去除腐蚀产物后的微观形貌

图10 腐蚀产物膜的EDS分析结果

图11 腐蚀产物的XPS分析

表3 腐蚀产物膜的EDS分析结果

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