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  

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

作　　者：杨留洋 谭卓伟 李同跃 张大磊 邢少华[4] 鞠虹 YANG Liuyang;TAN Zhuowei;LI Tongyue;ZHANG Dalei;XING Shaohua;JU Hong(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China;College of New Energy,China University of Petroleum(East China),Qingdao 266580,China;Offshore Oil Engineering(Qingdao)Co.Ltd.,Pipe Manufacturing and Shipment Operation Department,Qingdao 266580,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China)

机构地区：[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

出　　处：《材料研究学报》2022年第5期381-391,共11页Chinese Journal of Materials Research

基　　金：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)。

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。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 CO;saturated 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.

关 键 词：材料失效与保护 缺陷 WBE 电化学 CO_(2)腐蚀 传质 壁面剪切力 

分 类 号：TG172.63[金属学及工艺—金属表面处理]