焊管2026，Vol.49Issue(8)：22-32,11.DOI:10.19291/j.cnki.1001-3938.2026.08.003
交流干扰下缺陷尺寸对涂层剥离区X80钢腐蚀行为的影响
Effect of Defect Size on X80 Steel Corrosion Behavior in Coating Delamination Zone under AC Interference
万红霞 1刘义 1刘茹 1宋冬冬2
作者信息
- 1. 中国石油大学(北京)新能源与材料学院,北京 102249
- 2. 华北电力大学 电站能量传递转化与系统教育部重点实验室,北京 102206
- 折叠
摘要
Abstract
To address the issue of buried pipeline failure caused by the synergistic effect of AC stray currents and damage to anti-corrosion coatings,it takes X80 steel as the research object,and investigates the influence of different initial defect sizes(0 mm,0.2 mm and 1 mm)on the corrosion behaviour of the delaminated coating X80 steel system.The results show that AC-induced interfacial alkali contamination significantly accelerated the coating delamination process;the size of the defect determines the progression of localized corrosion.At a minute defect of 0.2 mm,the presence of iron oxide plugging causes the increasing of the impedance at this location.However,the formation of an acidfield occlusion battery exacerbates localized corrosion at the defect site.When the defect enlarges to 1 mm,the corrosion products lose their protective barrier function,resulting in lateral corrosion at the defect site.Finite element analysis further revealed that the smaller the defect in the delaminated coating,the more pronounced the eight-pointed star pattern of instantaneous current concentration in the central region,implying that microdefects present a higher risk of pitting and perforation under alternating current conditions.The research results can provide theoretical support for the safety assessment and protection of buried pipelines under alternatingcurrent interference.关键词
X80管线钢/杂散电流腐蚀/涂层缺陷尺寸/有限元仿真Key words
X80 pipeline steel/straycurrent corrosion/coating defect size/finiteelement simulation分类
矿业与冶金引用本文复制引用
万红霞,刘义,刘茹,宋冬冬..交流干扰下缺陷尺寸对涂层剥离区X80钢腐蚀行为的影响[J].焊管,2026,49(8):22-32,11.
