磁场对NaCl溶液中X52管线钢腐蚀行为的影响

doi:10.11902/1005.4537.2021.117

中国腐蚀与防护学报

2022, Vol. 42

Issue (3): 501-506 DOI: 10.11902/1005.4537.2021.117

研究报告

本期目录 | 过刊浏览

磁场对NaCl溶液中X52管线钢腐蚀行为的影响

杨永¹(

), 张庆保¹, 朱万成², 罗艳龙¹

^1.中国特种设备检测研究院北京 100029
^2.中国石油塔里木油田公司英买油气开发部库尔勒 841000

Effect of Magnetic Field on Corrosion Behavior of X52 Pipeline Steel in NaCl Solution

YANG Yong¹(

), ZHANG Qingbao¹, ZHU Wancheng², LUO Yanlong¹

^1.China Special Equipment Inspection and Research Institute, Beijing 100029, China
^2.Yingmai Oil and Gas Development Department, Petro China Tarim Oilﬁeld Company, Korla 841000, China

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摘要:

采用开路电位、极化曲线、电化学阻抗谱及腐蚀形貌观察等技术，研究了不同磁场强度 (0、0.9、1.9及2.8 kA/m) 对3.5%NaCl溶液中X52管线钢腐蚀行为的影响。结果表明：磁场使腐蚀电位负移、腐蚀电流密度增大、电荷转移阻抗减小，并一定程度上改变腐蚀形貌；磁场强度越大，对电化学腐蚀行为的影响越大。机理分析表明，磁场对电化学反应过程的影响由电极表面磁感应强度、磁感应梯度以及电解质中离子磁性、浓度等多因素综合决定；Lorentz力加速Fe²⁺扩散、减小双电层厚度及Kelvins力对Cl^-作用而增加电极界面氧含量等腐蚀促进作用大于Kelvins力使Fe²⁺在电极表面聚集的腐蚀抑制作用，从而整体上促进了电化学腐蚀。

关键词 ：磁场, 磁感应强度, 3.5%NaCl溶液, 腐蚀行为

Abstract：

Magnetic flux leakage internal inspection is the main method for detecting metal damage in oil and gas pipelines. After the magnetic flux leakage testing is implemented, there will exist a residual magnetic field in the pipeline for a long time. The influence of such residual magnetic field on the corrosion behavior of the pipeline steel is not completely clear yet. Therefore, the influence of different magnetic field intensities (0.9, 1.9 and 2.8 kA/m respectively) on the corrosion behavior of X52 pipeline steel in 3.5%NaCl solution was investigated by means of open circuit potential, polarization curves, electrochemical impedance spectroscopy and corrosion morphology observation techniques. The results indicated that the presence of magnetic field can shift negatively the corrosion potential, increased the corrosion current density, reduced the charge transfer resistance, and changed the corrosion morphology to a certain extent. The greater the magnetic field intensity, the greater the influence on the electrochemical corrosion behavior. Through mechanism analysis, it follows that the influence of magnetic field on the electrochemical reaction process may comprehensively be determined by multiple factors such as the magnetic flux intensity near the electrode surface, the magnetic field gradient, the ion-magnetism and -concentration in the electrolyte. The Loren magnetic force can accelerate the diffusion of Fe²⁺and reduce the thickness of the electric double layer, while the Kelvin force can increase the oxygen content of the electrode interface, all the above factors could promote the corrosion process, the effect of which may be stronger than the corrosion inhibition effect induced by that the Kelvin force causing Fe²⁺ to accumulate on the electrode surface, so that the electrochemical corrosion process was generally promoted.

Key words： magnetic field magnetic flux intensity 3.5%NaCl solution corrosion behavior

收稿日期: 2021-05-24

ZTFLH:

TG174

基金资助:市场监管总局科技计划项目(2019MK136);中国特检院科研项目 (2019青年03)

通讯作者: 杨永 E-mail: 39530354@qq.com

Corresponding author: YANG Yong E-mail: 39530354@qq.com

作者简介: 杨永，男，1979年生，博士，高级工程师

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引用本文:

杨永, 张庆保, 朱万成, 罗艳龙. 磁场对NaCl溶液中X52管线钢腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2022, 42(3): 501-506.
Yong YANG, Qingbao ZHANG, Wancheng ZHU, Yanlong LUO. Effect of Magnetic Field on Corrosion Behavior of X52 Pipeline Steel in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 501-506.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.117 或 https://www.jcscp.org/CN/Y2022/V42/I3/501

图1 不同的磁场强度对X52管线钢腐蚀电位影响

图2 不同磁场强度下的恒电位及动电位极化曲线

图3 不同磁场强度下的EIS Nyquist和Bode图及等效电路

表1 不同磁场强度下NaCl溶液中试样EIS等效电路拟合结果

图4 不同磁场强度下X52管线钢在3.5%NaCl溶液中浸泡10 d的腐蚀形貌

图5 试样表面磁感应强度分布示意图

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