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

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Abstract

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.

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Authors and Affiliations

  1. Advanced Material & Technology Institute, University of Science & Technology Beijing, Beijing, 100083, China

    Kui Xiao  (肖葵), Chaofang Dong, Junsheng Wu, Longjiao Xu & Xiaogang Li  (李晓刚)

  2. Nuclear & Radiation Safety Centre, Ministry of Environmental Protection of People’s Republic of China, Beijing, 100082, China

    Xin Zhang

Authors
  1. Kui Xiao  (肖葵)
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  2. Chaofang Dong
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  3. Xin Zhang
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  4. Junsheng Wu
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  5. Longjiao Xu
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  6. Xiaogang Li  (李晓刚)
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Corresponding author

Correspondence to Xiaogang Li  (李晓刚).

Additional information

Funded by the National Natural Science Foundation of China (Nos. 50871021 and 50701006)

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Xiao, K., Dong, C., Zhang, X. et al. Corrosion of carbon steel under epoxy-varnish coating studied by scanning Kelvin probe. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 27, 825–829 (2012). https://doi.org/10.1007/s11595-012-0556-6

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  • DOI: https://doi.org/10.1007/s11595-012-0556-6

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