Local environment under simulated disbonded coating on steel pipelines in soil solution

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	Local environment under simulated disbonded coating on steel pipelines in soil solution
	M. C. Yan; J. Q. Wang; E. H. Han; W. Ke
	2008
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	50 期号:5 页码:1331-1339
摘要	Taking advantage of microelectrode technique, the local potential and pH in a crevice simulating disbonded coating on X70 pipeline steel were investigated as a function of cathodic protection (CP) in a near neutral pH soil bulk solution bubbled with 5% CO2/N-2 gas. The experimental potential-pH (E-pH) diagrams were established for the steel in the crevice. Stress corrosion cracking (SCC) susceptibility of the steel in the local environment in the crevice was analyzed based on the experimental E-pH diagrams. The results showed that the local steel potential in the deep of the crevice was independent on CP potential applied at the opening. Due to the effect of the atmospheric CO2, a near-neutral pH local environment promoting near-neutral pH SCC (also known as transgranular SCC, TGSCC) might be harbored in the crevice even with normal CP at the opening. During CP interruption, the steel potential decay and CO2 absorption (pH decrease) might shift E-pH points into a susceptibility region of near-neutral pH SCC. (c) 2008 Elsevier Ltd. All rights reserved.
部门归属	[yan, maocheng; wang, jianqiu; han, enhou; ke, wei] chinese acad sci, inst met res, environm corros ctr, shenyang 110016, peoples r china.;wang, jq (reprint author), chinese acad sci, inst met res, environm corros ctr, shenyang 110016, peoples r china;jiqwang@imr.ac.cn
关键词	Microelectrode Technique Cathodic Protection Disbonded Coatings Stress Corrosion Crevice Corrosion Stress-corrosion Cracking Cathodic Protection Electrochemical Measurements Neutral Ph
URL	查看原文
WOS记录号	WOS:000256184800015
引用统计	被引频次：86[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33262
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. C. Yan,J. Q. Wang,E. H. Han,et al. Local environment under simulated disbonded coating on steel pipelines in soil solution[J]. Corrosion Science,2008,50(5):1331-1339.
APA	M. C. Yan,J. Q. Wang,E. H. Han,&W. Ke.(2008).Local environment under simulated disbonded coating on steel pipelines in soil solution.Corrosion Science,50(5),1331-1339.
MLA	M. C. Yan,et al."Local environment under simulated disbonded coating on steel pipelines in soil solution".Corrosion Science 50.5(2008):1331-1339.