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Application of Electrochemical Impedance Spectroscopy to evaluate cathodically protected coated steel in seawater

Abstract

Two types of organic coated carbon steel (S235JR2 grade) electrodes were exposed to artificial seawater environment. One prepared type was defect free while the other one had an intentionally introduced φ0,5 cm coating defect. Both kinds of samples were polarized during the exposure to four potentials corresponding to four different cathodic protection levels. Evolution of their EIS spectra is presented in this paper. Results obtained in the experiment indicate that protective organic coating condition could be estimated and monitored in time based on EIS investigations. If a sample is defected EIS allows a recognition of overprotected and unprotected sample. Distinguishing a fully protected sample from partially protected sample based on EIS was troublesome.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
CONSTRUCTION AND BUILDING MATERIALS no. 181, pages 721 - 726,
ISSN: 0950-0618
Language:
English
Publication year:
2018
Bibliographic description:
Narożny M., Żakowski K., Darowicki K.: Application of Electrochemical Impedance Spectroscopy to evaluate cathodically protected coated steel in seawater// CONSTRUCTION AND BUILDING MATERIALS. -Vol. 181, (2018), s.721-726
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.conbuildmat.2018.06.033
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Sources of funding:
  • grant NCBiR nr 2012/05/N/ST8/02899
Verified by:
Gdańsk University of Technology

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