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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• 作者：Haijie Wang (1)
  Jia Wang (1) (2)
  Wei Wang (1)
  Wei Zhang (3)
  
  1. College of Chemistry and Chemical Engineering ; Ocean University of China ; Qingdao ; 266011 ; P. R. China
  2. State Key Laboratory for Corrosion and Protection of Metals ; Shenyang ; 110016 ; P. R. China
  3. Qingdao Marine Corrosion Institute ; Central Research Institute for Steel and Iron ; Qingdao ; 266071 ; P. R. China
  
• 关键词：organic coatings ; defective coatings ; deterioration ; EIS ; wire beam electrode
• 刊名：Journal of Ocean University of China
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：14
• 期：2
• 页码：269-276
• 全文大小：795 KB
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• 刊物主题：Oceanography; Meteorology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5021

文摘

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.