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

作　　者：李炳 邹慧慧 吴凯 董亮[2,3] 崔伟 王修云 

机构地区：[1]中海石油广东天然气有限责任公司,珠海519015 [2]安科工程技术研究院(北京)有限公司,北京100083 [3]北京科技大学,北京100083

出　　处：《腐蚀与防护》2016年第8期688-692,共5页Corrosion & Protection

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100A/m2,发生交流腐蚀的可能性较大。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/m^2 induced by nearby electrified railway.

关 键 词：3PE涂层 腐蚀 电气化铁路 交流腐蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]