剥离PE防腐层破损点下钢质管线的阴极保护
发布时间：2018-08-19 18:42
【摘要】：基于长输管线三层聚乙烯(3PE)防腐层失粘剥离现场开挖调查的情况,构建剥离防腐层下管道表面微区环境腐蚀模拟研究实验装置,研究华南酸性土壤环境条件剥离防腐层下管体表面的阴极保护和微区环境特征,采用微电极技术监测剥离区管线钢表面的局部电位和环境p H值的变化。结果表明,剥离区管线的有效保护距离随阴极保护电位负移而增加;在高电阻率酸性土壤环境中,剥离防腐层下的阴极保护仅限于破损点附近,剥离区深处管体处于自腐蚀状态;剥离防腐层下阴极保护有效性及其屏蔽程度可由剥离防腐层下微区溶液p H值判定。
[Abstract]:Based on the investigation of field excavation of three-layer polyethylene (3PE) anticorrosive coating for long distance transportation pipeline, a simulated experimental device for environmental corrosion simulation of pipeline surface micro-area under peeling anticorrosion coating was constructed. The cathodic protection and microenvironmental characteristics of the lower pipe surface of the stripping anticorrosive coating were studied under the environmental conditions of acidic soil in South China. The local potential and environmental pH value of pipeline steel in stripping zone were monitored by microelectrode technique. The results show that the effective protection distance increases with the negative shift of cathodic protection potential, and in high resistivity acidic soil, the cathodic protection under stripping anticorrosion layer is only near the damage point. The effectiveness and shielding degree of cathodic protection under stripping corrosion coating can be determined by pH value of microzone solution under stripping corrosion coating.
【作者单位】： 中国科学院金属研究所国家腐蚀控制工程技术研究中心材料环境腐蚀研究中心;中国石油管道公司大连输油气分公司鞍山输油站;中国石油天然气股份有限公司西南管道分公司;
【分类号】：TG174.41
本文编号：2192493
[Abstract]:Based on the investigation of field excavation of three-layer polyethylene (3PE) anticorrosive coating for long distance transportation pipeline, a simulated experimental device for environmental corrosion simulation of pipeline surface micro-area under peeling anticorrosion coating was constructed. The cathodic protection and microenvironmental characteristics of the lower pipe surface of the stripping anticorrosive coating were studied under the environmental conditions of acidic soil in South China. The local potential and environmental pH value of pipeline steel in stripping zone were monitored by microelectrode technique. The results show that the effective protection distance increases with the negative shift of cathodic protection potential, and in high resistivity acidic soil, the cathodic protection under stripping anticorrosion layer is only near the damage point. The effectiveness and shielding degree of cathodic protection under stripping corrosion coating can be determined by pH value of microzone solution under stripping corrosion coating.
【作者单位】： 中国科学院金属研究所国家腐蚀控制工程技术研究中心材料环境腐蚀研究中心;中国石油管道公司大连输油气分公司鞍山输油站;中国石油天然气股份有限公司西南管道分公司;
【分类号】：TG174.41
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