利用<strong>WBE</strong>及<strong>EIS</strong>测试技术对管道缺陷区动态冲刷腐蚀行为的研究

doi:10.11901/1005.3093.2021.134

材料研究学报

2022, Vol. 36

Issue (5): 381-391 DOI: 10.11901/1005.3093.2021.134

研究论文

本期目录 | 过刊浏览

利用WBE及EIS测试技术对管道缺陷区动态冲刷腐蚀行为的研究

杨留洋¹, 谭卓伟², 李同跃³, 张大磊¹(

), 邢少华⁴(

), 鞠虹¹

^1.中国石油大学(华东)材料科学与工程学院青岛 266580
^2.中国石油大学(华东)新能源学院青岛 266580
^3.海洋石油工程(青岛)有限公司制管装船作业部青岛 266580
^4.中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室青岛 266237

Dynamic Corrosion Behavior of Pipeline Defects Characterized by WBE and EIS Testing Techniques

YANG Liuyang¹, TAN Zhuowei², LI Tongyue³, ZHANG Dalei¹(

), XING Shaohua⁴(

), JU Hong¹

^1.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China
^2.College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
^3.Offshore Oil Engineering (Qingdao) Co. Ltd., Pipe Manufacturing and Shipment Operation Department, Qingdao 266580, China
^4.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China

引用本文:

杨留洋, 谭卓伟, 李同跃, 张大磊, 邢少华, 鞠虹. 利用WBE及EIS测试技术对管道缺陷区动态冲刷腐蚀行为的研究[J]. 材料研究学报, 2022, 36(5): 381-391.
Liuyang YANG, Zhuowei TAN, Tongyue LI, Dalei ZHANG, Shaohua XING, Hong JU. Dynamic Corrosion Behavior of Pipeline Defects Characterized by WBE and EIS Testing Techniques[J]. Chinese Journal of Materials Research, 2022, 36(5): 381-391.

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摘要:

油气管道内缺陷的存在会使油气输运过程中出现局部区域流体急剧变化,导致管道腐蚀失效。本文通过微电极阵列测试技术(WBE)以及宏观电化学测试技术(EIS)研究管道缺陷处的冲刷腐蚀行为,以COMSOL Multiphysics中的流体力学模块辅助分析缺陷不同区域在流动状态下的腐蚀机制。结果表明,缺陷不同区域之间的流场变化导致腐蚀差异性,紧邻缺陷的上缘与下缘区域承受较大的湍流动能及壁面剪切力表现为阳极,腐蚀较为严重；缺陷底层区域以及远离缺陷两侧的区域由于湍流动能较小而边界层厚度大,离子传质作用较弱,表现为阴极,缺陷底层区域相比于缺陷上下缘区腐蚀进行缓慢。随着流动腐蚀时间的延长,缺陷上下缘区域腐蚀更为严重,缺陷整体有沿深度方向扩展加深的趋势。

关键词 ：材料失效与保护, 缺陷, WBE, 电化学, CO₂腐蚀, 传质, 壁面剪切力

Abstract：

The existence of defects in oil and gas pipelines will cause rapid changes in local area fluids where the defects located, which during oil and gas transportation may lead to pipeline corrosion failure. For understanding the nature of this phenomenon, the corrosion behavior of defects in CO₂saturated NACE solution was studied via wire beam electrodes (WBE)- and electrochemical impedance spectroscope (EIS)-techniques, meanwhile, the relevant corrosion mechanism of defects located in different regions in the flow field was analyzed by means of the hydrodynamics modules of the so called "COMSOL Multiphysics". The results show that the variation of flow field on defects in different locations may lead to different appearance of corrosion there. The areas nearby the upper and lower edges of the defect may be subjected to large turbulent kinetic energy and wall shear stress, which may naturally act as anode, hence are suffered from serious corrosion. On the other hand, the bottom area of the defect and the area far away from the defect may act as cathode due to small turbulent kinetic energy and large boundary layer thickness, thus the corrosion progresses slowly there. With the extension of the flow corrosion time, the corrosion of the upper and lower edges of the defect becomes more serious, as a whole, defects have a tendency to expand and deepen vertically.

Key words： materials failure and protection defects WBE electrochemical CO₂ corrosion mass transfer wall shear stress

收稿日期: 2021-02-06

ZTFLH:

TG172.6+3

基金资助:国家自然科学基金(51774314);山东省自然科学基金(ZR2018MEM002);中国石油大学(华东)自主创新项目(19CX05001A);山东省重点研发计划(2019GHY112065)

作者简介: 杨留洋,男,1995年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.134 或 https://www.cjmr.org/CN/Y2022/V36/I5/381

图1 电极丝插槽示意图

图2 丝束电极阵列实物图

图3 循环流动腐蚀测试环路示意图

图4 缺陷区网格划分二维模型

图5 微电极阵列测试下电偶电流等值线分布图

图6 WBE测试下各分区平均电偶电流的分布变化图

图7 试样不同位置在冲刷12 h之后的EIS谱图变化

图8 用于EIS拟合的等效电路模型

表1 缺陷试样不同排列耦合的阻值参数变化

图9 中间一行电极丝腐蚀形貌

图10 去除腐蚀产物膜之后的三维形貌和缺陷区去除腐蚀产物前后的深度变化

图11 缺陷试样不同分区示意图

图12 缺陷及其周边区域的流速及湍流动能分布变化

图13 缺陷及其周边区域壁面剪切力变化曲线

图14 缺陷区湍流耗散率变化曲线

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