干湿交替土壤环境中剥离涂层管线钢阴极保护有效性

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	干湿交替土壤环境中剥离涂层管线钢阴极保护有效性
其他题名	Cathodic Protection Effectiveness of Pipeline Beneath Disbonded Coating in a Dry-wet Alternating Soil Environment
	赵君 1; 闫茂成 2; 吴长访 1; 舒韵 2; 郭爱玲 3
	2018
发表期刊	腐蚀科学与防护技术
ISSN	1002-6495
卷号	30.0 期号:005 页码:508-512
摘要	基于长输管线三层聚乙烯（3PE）防腐层失粘剥离的现场调查情况,构建剥离防腐层下管道腐蚀模拟实验装置,研究干湿交替工况剥离防腐层下管道的阴极保护电流和电位分布、阴极保护有效距离及屏蔽区管线的腐蚀行为。结果表明,带破损点涂层剥离区内阴极保护电位梯度和保护电流主要集中在破损点区域,而缝隙深处管体处于自腐蚀状态;随干湿循环次数的增多,破损点至缝隙内45 mm处稳定后的局部电位逐渐负移;剥离间隙1 mm情况下,有效保护距离仅数厘米。
其他摘要	Based on a field survey of disbondment failure cases of coatings of three layered polyethylene（3PE） for a long-distance pipeline, a simulating experimental apparatus was constructed to study the distribution of cathodic protection（CP） current and potential of pipeline beneath disbonded coating in the environment of alternatively wetting and drying with soil extract. The potential of pipeline and pH value of the local environment was monitored with microelectrode technology. Results show that CP is limited to the opening holiday. The cathodic protection potential gradient and CP current are mainly concentrated near the holiday, while for spots of the pipeline steel where located in the deep within crevice is in a free corrosion state. With increasing dry/wet cycles, the local potential of the area from the damage point to the depth 45 mm in the crevice gradually shifts negatively. The effective protection distance is only a few centimeters when the disbonded gap is 1 mm.
关键词	防腐层土壤腐蚀阴极保护干湿交替 3PE剥离
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:6334691
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/143365
专题	中国科学院金属研究所
作者单位	1.中国石油天然气股份有限公司管道分公司管道科技研究中心 2.中国科学院金属研究所 3.中国石化化工销售公司华中分公司
推荐引用方式 GB/T 7714	赵君,闫茂成,吴长访,等. 干湿交替土壤环境中剥离涂层管线钢阴极保护有效性[J]. 腐蚀科学与防护技术,2018,30.0(005):508-512.
APA	赵君,闫茂成,吴长访,舒韵,&郭爱玲.(2018).干湿交替土壤环境中剥离涂层管线钢阴极保护有效性.腐蚀科学与防护技术,30.0(005),508-512.
MLA	赵君,et al."干湿交替土壤环境中剥离涂层管线钢阴极保护有效性".腐蚀科学与防护技术 30.0.005(2018):508-512.