Modeling of the mechano-electrochemical effect at corrosion defect with varied inclinations on oil/gas pipelines

作     者：Zhu-Wu Zhang Jin-Chang Wang Jiu-Hong Zhang Y.Frank Cheng Zhu-Wu Zhang;Jin-Chang Wang;Jiu-Hong Zhang;Y.Frank Cheng

作者机构：College of Chemical EngineeringFuzhou UniversityFuzhou350116FujianChina Department of Mechanical EngineeringUniversity of CalgaryCalgaryT2N 1N4AlbertaCanada 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2021年第18卷第5期

页      面：1520-1529页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 082003[工学-油气储运工程] 

基　　金：supported by the National Natural Science Foundation of China(No.51705077) Natural Science Foundation of Fujian Province(No.2018J01768) the University of Calgary 

主　　题：Pipelines Corrosion defect assessment Mechano-electrochemical effect Finite element model 

摘      要：A 3-dimensional finite element model was built to determine the effect of inclination angle of a corro sion defect on local mechano-electrochemical(M-E)effect in a simulated soil *** of the high effect of the defect inclination angle on the M-E effect,when the inclination angle is 0°(i.e.,the primary axis of the defect parallel to the longitudinal direction of the pipe),the greate st stress concentration level at the defect can be observed,which is associated with the lowest corrosion potential,the greatest anodic current density and the most serious accelerated localized *** the inclination angle is 90°,the stress concentration level reduces and the corrosion potential becomes less negative,accompanying with the decreased anodic/cathodic current ***,when the ratio(r_(ca))of the primary axial length of the defect to its secondary axial length is 1,the defect inclination does not affect the stress and the electrochemical corrosion rate at the *** the increase of r_(ca),the effect of the defect inclination angle is more apparent.