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

•Samples were coated with an intact and defected coating.•Long term seawater expositions of samples kept at four different protection levels were performed.•Electrochemical Impedance Spectroscopy spectra evaluation during the exposition.•Corrosion rate investigation of cathodic protected samples. Tw...

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Bibliographic Details
Published in:Construction & building materials 2018-08, Vol.181, p.721-726
Main Authors: Narozny, M., Zakowski, K., Darowicki, K.
Format: Article
Language:English
Subjects:
Analysis
Carbon steel
Cathodic protection
Cathodicprotection
Coatings
Electrochemical Impedance Spectroscopy
Environmental aspects
Impedance spectroscopy
Organic coatings
Seawater
Steel
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Summary:•Samples were coated with an intact and defected coating.•Long term seawater expositions of samples kept at four different protection levels were performed.•Electrochemical Impedance Spectroscopy spectra evaluation during the exposition.•Corrosion rate investigation of cathodic protected samples. 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 recognition of overprotected and unprotected sample. Distinguishing a fully protected sample from partially protected sample based on EIS was troublesome.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2018.06.033