Corrosion of carbon steel under epoxy-varnish coating studied by scanning Kelvin probe

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• 作者：Kui Xiao (1)
  Chaofang Dong (1)
  Xin Zhang (2)
  Junsheng Wu (1)
  Longjiao Xu (1)
  Xiaogang Li (1)
  
• 关键词：carbon steel ; coating ; salt spray test ; scanning kelvin probe
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2012
• 出版时间：October 2012
• 年：2012
• 卷：27
• 期：5
• 页码：825-829
• 全文大小：346KB
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• 作者单位：Kui Xiao (1)
  Chaofang Dong (1)
  Xin Zhang (2)
  Junsheng Wu (1)
  Longjiao Xu (1)
  Xiaogang Li (1)
  
  1. Advanced Material & Technology Institute, University of Science & Technology Beijing, Beijing, 100083, China
  2. Nuclear & Radiation Safety Centre, Ministry of Environmental Protection of People’s Republic of China, Beijing, 100082, China
  
• ISSN：1993-0437

文摘

The corrosion behavior of partly coated carbon steel was investigated by salt spray test and scanning Kelvin probe (SKP) in order to understand the long-term corrosion behavior of coated carbon steel in marine atmosphere environment. The localized corrosion was accurately characterized by SKP in both coated and uncoated regions. The SKP results showed that Volta potential varied with the test time, and the more the corrosion products, the more positive the potential. The borderline between coated and uncoated regions of partly coated steel shifted towards the coated side with the increasing of test time. The coating disbonding rate could be determined according to the shift of potential borderline measured by SKP. The corrosion mechanism of partly coated steel in NaCl salt spray was discussed according to the potential maps and corrosion morphologies.