某三层PE埋地钢管管体的腐蚀原因
Corrosion Reason for a Buried Gas Pipeline with 3PE Coating
摘 要
通过管体外观检查、土壤环境测试、阴极保护与交直流干扰检测、腐蚀产物分析等方法，对某埋地钢管3PE防腐蚀层缺陷处管体的腐蚀情况及其成因进行了分析。结果表明：防腐蚀层缺陷处管体的腐蚀形貌与交流腐蚀类似，且该管线与电气化铁路交叉穿越，腐蚀点处最大交流电流密度达到100 A/m2，发生交流腐蚀的可能性较大。
腐蚀
电气化铁路
交流腐蚀
3PE coating
corrosion
electrified railway
AC corrosion
Abstract
The corrosion reasons of a gas pipeline with 3PE coating were analyzed by macro observation, soil environment testing, evaluation of cathodic protection and interference of alternating current (AC)/direct current (DC), and corrosion product analyzing. Results indicated that AC corrosion was most likely to be the cause of corrosion because of similar corrosion morphology, and the biggest AC current density was as high as 100 A/m2 induced by nearby electrified railway.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201608018
所属栏目 失效分析
基金项目
收稿日期 2015/4/14
修改稿日期
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备注崔 伟（1988-），助理工程师，硕士，从事油气管道的腐蚀与防护工作
引用该论文: LI Bing,ZOU Hui-hui,WU Kai,DONG Liang,CUI Wei,WANG Xiu-yun. Corrosion Reason for a Buried Gas Pipeline with 3PE Coating[J]. Corrosion & Protection, 2016, 37(8): 688
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参考文献
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【5】吕德东. 油田埋地管道防腐层破损点检测及影响因素[J]. 管道技术与设备,2007(3):39-40.
【6】孟繁亮. 管道防腐层破损原因及检测技术探讨[J]. 化学工程与设备,2012(5):107-111.
【7】代卿,青树勇. 天然气管道三层PE防腐层的常见失效模式[J]. 内蒙古石油化工,2011(6):65-66.
【8】SANCHEZ-GHENNO J C，SOSA-HERNANDEZ E C，AGUILSR A C，et al. Effects of magnetic fields on the corrosion behavior of hydrocarbon transmission pipelines[C]//Corrosion/2010. Houston,TX:NACE,2010.
【9】李自力,杨燕. 金属管道交流腐蚀研究新进展[J]. 石油学报,2012,33(1):164-171.
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【11】YUNOVICH M,THOMPSON N G. AC corrosion:corrosion rate and mitigation requirements[C]//Corrosion/2004. Houston,TX:NACE,2004.
【12】NIELSEN L V. Role of alkalization in AC induced corrosion of pipelines and concequences hereof in relation to CP requirements[C]//Corrosion/2005. Houston,TX:NACE,2005.
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