X70钢在交直流混合干扰下的腐蚀特性研究

doi:10.11885/j.issn.1674-5086.2023.07.31.01

摘要/Abstract

摘要： 针对部分地区油气管道和高压输电线路、电气化铁路交叉或平行敷设的情况，导致埋地管道面临交直流混合干扰腐蚀的风险。采用电化学测试，结合偏光显微镜、三维光学显微镜、XRD等检测手段，开展了X70钢在交直流混合干扰下的腐蚀特性研究。结果表明：1) 交直流混合干扰下临界电流密度为120 A/m$^2$；2) 交直流混合干扰下容抗弧的半径与电流密度不存在正相关关系；3) 交直流混合干扰阳极区既延续了直流干扰的腐蚀强度也发挥了交流电的振荡和点蚀作用，导致腐蚀坑内发生二次局部破坏，产生大量点蚀和缝隙，逐渐呈现为刻蚀现象，使部分未完全腐蚀的X70钢(部分覆盖有腐蚀产物膜)失去支撑后脱落在溶液中；4) 在180 A/m$^2$的电流密度下，交直流混合干扰试样腐蚀深度达264 μm。

关键词: 杂散电流腐蚀, 交直流混合干扰, X70钢, 刻蚀, 协同作用

Abstract: In certain areas, the cross or parallel installation of oil and gas pipelines, high-voltage transmission lines, and electrified railways creates the risk of AC-DC mixed interference corrosion in buried pipelines. Through electrochemical tests, combined with polarized light microscopy, three-dimensional optical microscopy, and XRD, the AC-DC mixed interference corrosion characteristics of X70 steel in the intersection area of electrified railways, high-voltage transmission lines, and natural gas pipelines were studied. The results show that: 1) the critical current density under AC-DC mixed interference is 120 A/m$^2$; 2) there is no positive correlation between the radius of capacitive reactance arc and current density under AC-DC mixed interference; 3) the AC-DC mixed interference anode area not only continued the corrosion intensity of DC interference, but also played the role of AC oscillation and pitting, resulting in secondary local damage in the corrosion pit, forming a large number of pitting and crevices, and gradually showing the phenomenon of etching which makes the partially corroded X70 steel (partially covered with a corrosion product film) unsupported and exfoliated in solution; 4) at the current density of 180 A/m$^2$, the corrosion depth of the specimen under AC-DC mixed interference reaches 250 μm.

Key words: stray current corrosion, AC-DC mixed interference, X70 steel, etching, synergistic effect

中图分类号:

贺三, 余锐, 张剑雄, 李彬, 徐慧兰. X70钢在交直流混合干扰下的腐蚀特性研究[J]. 西南石油大学学报(自然科学版), 2025, 47(2): 164-174.

HE San, YU Rui, ZHANG Jianxiong, LI Bin, XU Huilan. Corrosion Characteristics of X70 Steel Under AC-DC Mixed Interference[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 164-174.

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