AC Corrosion Electrode Process of X90 Steel Based on Equivalent Circuit Model
摘 要
通过电化学测试明确了交流电作用下X90钢腐蚀电位和实时电位波形的变化规律;建立了包含阳极电极过程和阴极电极过程的等效电路模型,并通过Multisim进行了求解,通过分析阳极和阴极电荷转移电阻(Ra,Rc)、双电层电容(Cdl)对交流腐蚀电位及阳极和阴极法拉第电流(Ia,Ic)、非法拉第电流(Idl)的影响,分析了电极过程动力学参数对交流腐蚀的影响。结果表明;随着交流电密度增加,X90钢腐蚀电位的负移程度先增大后减小,且于100 A/m2处达到最小值,实时电位波形与正弦交流干扰具有相同的频率和波形;随着Ra增大,通过阳极和阴极过程的法拉第电流均会逐渐减小;当阳极过程和阴极过程电荷转移电阻大小不同时,交流电通过腐蚀电极时会发生整流效应,使实时电位的波形中产生直流偏置,造成腐蚀电位发生偏移;相对于电荷转移电阻,双电层电容对交流电作用下腐蚀电极过程的影响更为明显。
Abstract
The change law of corrosion potential and real-time potential waveform of X90 steel under the action of alternating current was clarified by electrochemical test; an equivalent circuit model including anodic electrode process and cathodic electrode process was established and solved by Multisim. By analyzing the effects of anodic and cathodic charge transfer resistances (Ra, Rc) and electric double layer capacitance on AC corrosion potential and anodic and cathodic Faradaic currents (Ia, Ic) and non-Faradaic currents (Idl), the effects of electrode process kinetic parameters on AC corrosion were analyzed. The results showed that with the increase of AC density, the degree of negative shift of corrosion potential of X90 steel first increased and then decreased, and reached the minimum value when the current density was 100 A/m2. The real-time potential waveform had the same frequency and waveform as sinusoidal AC interference. As Ra increased, the Faradaic current through both the anodic and cathodic processes gradually decreases When the anodic process and the cathodic process had different charge transfer resistances, a rectification effect would occur when the alternating current passes through the corrosion electrode, causing a DC bias in the waveform of the real-time potential, causing the corrosion potential to shift. Compared with the charge transfer resistance, the electric double layer capacitance had a more obvious effect on the corrosion process of the electrode under the action of alternating current.
中图分类号 TG172 DOI 10.11973/fsyfh-202207009
所属栏目 试验研究
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收稿日期 2020/8/20
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引用该论文: WANG Ailing,LI Kaihong,ZHANG Zhe,REN Hongyu,WANG Xingli,WANG Leichao. AC Corrosion Electrode Process of X90 Steel Based on Equivalent Circuit Model[J]. Corrosion & Protection, 2022, 43(7): 57
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【4】WANG X, XU C, CHEN Y, et al. Effects of stray AC on corrosion of 3-layer polyethylene coated X70 pipeline steel and cathodic delamination of coating with defects in 3.5 wt% NaCl solution[J]. Corrosion Engineering, Science and Technology, 2018, 53(3):214-225.
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【6】KUANG D, CHENG Y. AC corrosion at coating defect on pipelines[J]. Corrosion, 2014, 71(3):267-276.
【7】ZHANG S, LI Z, YANG C, et al. The AC corrosion mechanisms and models:A review[J]. Corrosion, 2020, 76(2):188-201.
【8】CHIN D T, VENKATESH S. A study of alternating voltage modulation on the polarization of mild steel[J]. Journal of The Electrochemical Society, 1979, 126(11):1908-1913.
【9】CHIN D T, FU T W. Corrosion by alternating current:a study of the anodic polarization of mild steel in Na2SO4 solution[J]. Corrosion, 1979, 35(11):514-523.
【10】GOIDANICH S, LAZZARI L, ORMELLESE M. AC corrosion-Part 1:Effects on overpotentials of anodic and cathodic processes[J]. Corrosion Science, 2010, 52(2):491-497.
【11】WANG X, SONG X, CHEN Y, et al. Corrosion Behavior of X70 and X80 Pipeline Steels in Simulated Soil Solution[J]. International Journal of Electrochemical Science, 2018, 13(7):6436-6450.
【12】LALVANI S, LIN X. A theoretical approach for predicting AC-induced corrosion[J]. Corrosion Science, 1994, 36(6):1039-1046.
【13】IBRAHIM I, MEYER M, TAKENOUTI H, et al. AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection:II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism[J]. Journal of the Brazilian Chemical Society, 2016, 27(3):605-615.
【14】GHANBARI E, IANNUZZI M, LILLARD R. The mechanism of alternating current corrosion of API grade X65 pipeline steel[J]. Corrosion, 2016, 72(9):1196-1210.
【15】ZHANG R, VAIRAVANATHAN P R, LALVANI S B. Perturbation method analysis of AC-induced corrosion[J]. Corrosion Science, 2008, 50(6):1664-1671.
【16】XIAO H, LALVANI S B. A linear model of alternating voltage-induced corrosion[J]. Journal of The Electrochemical Society, 2008, 155(2):C69-C74.
【17】YUNOVICH M, THOMPSON N G. AC corrosion:mechanism and proposed model; proceedings of the 2004 International Pipeline Conference, F, 2004[C]. American Society of Mechanical Engineers.
【18】NIELSEN L V, COHN P. AC corrosion and electrical equivalent diagrams[J]. 4th Int Congr CeoCor (Brussels, Belgium:CeoCor, 2000), 2000, 1-20.
【19】JIANG Z T, DU Y X, LU M X, et al. New findings on the factors accelerating AC corrosion of buried pipeline[J]. Corrosion Science, 2014, 81:1-10.
【20】唐德志. 交流电流对埋地管道阴极保护系统的影响规律及作用机制研究[D]. 北京:北京科技大学, 2016.
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