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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
Source PublicationJournal of Ocean University of China
ISSN1672-5182
Volume14Issue:2Pages:269-276
AbstractThe 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.
description.department[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
KeywordOrganic 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
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73944
Collection中国科学院金属研究所
Recommended Citation
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.
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