The study of the varying characteristics of cathodic regions for defective coating in 3.5% sodium chloride solution by EIS and WBE

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	The study of the varying characteristics of cathodic regions for defective coating in 3.5% sodium chloride solution by EIS and WBE
	H. J.; Wang Wang, J.; Wang, W.; Zhang, W.
	2015
发表期刊	Journal of Ocean University of China
ISSN	1672-5182
卷号	14 期号:2 页码:269-276
摘要	The current distributions over carbon steel under iron red alkyd primer exposed to 3.5% sodium chloride solution were mapped using the wire beam electrode (WBE). The electrochemical impedance spectroscopy (EIS) of the WBE was carried out to analyze the performance of coating delamination and corrosion behavior of carbon steel beneath defective coating. The EIS data revealed that protective capability of coating decreased with immersion time and the degree of cathodic delamination showed a rapid rise. The current density distribution of WBE indicated that cathodic sites was located at the defect at the beginning of immersion and gradually spread into the intact coating. The cathodic regions were distinguished from the anodic area and distributed over the WBE. The changes of cathodic sites could reflect the deterioration process of defective coating. The cathodic area ratio was a more useful parameter than the cathodic delamination degree to evaluate the coating cathodic delamination. The polarity reversals of electrodes at the defect and beneath coating were observed. A simple discussion of relationship between the blister and the polarity reversal was made from a standpoint of electrochemical distribution. WBE method was able to map and record the changes of local cathodic sites beneath defective coating in real time, which could provide more detailed information about the local degradation of coating.
部门归属	[wang haijie ; wang jia ; wang wei] ocean univ china, coll chem & chem engn, qingdao 266011, peoples r china. [wang jia] state key lab corros & protect met, shenyang 110016, peoples r china. [zhang wei] cent res inst steel & iron, qingdao marine corros inst, qingdao 266071, peoples r china. ; wang, j (reprint author), ocean univ china, coll chem & chem engn, qingdao 266011, peoples r china. ; jwang@ouc.edu.cn
关键词	Organic Coatings Defective Coatings Deterioration Eis Wire Beam Electrode Electrochemical Impedance Spectroscopy Wire Beam Electrode Scanning Kelvin Probe Organic Coatings Oxygen Reduction Mild-steel Corrosion Delamination Mechanism Protection
URL	查看原文
WOS记录号	WOS:000350058900010
引用统计	被引频次：15[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/321006/73944
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. J.,Wang Wang, J.,Wang, W.,et al. The study of the varying characteristics of cathodic regions for defective coating in 3.5% sodium chloride solution by EIS and WBE[J]. Journal of Ocean University of China,2015,14(2):269-276.
APA	H. J.,Wang Wang, J.,Wang, W.,&Zhang, W..(2015).The study of the varying characteristics of cathodic regions for defective coating in 3.5% sodium chloride solution by EIS and WBE.Journal of Ocean University of China,14(2),269-276.
MLA	H. J.,et al."The study of the varying characteristics of cathodic regions for defective coating in 3.5% sodium chloride solution by EIS and WBE".Journal of Ocean University of China 14.2(2015):269-276.