Corrosion and cathodic protection of carbon steel in the tidal zone: Products, mechanisms and kinetics

•The corrosion product layer forming in the tidal zone is mainly made up of magnetite.•A thin film of magnetite is formed on the steel surface under cathodic protection.•Magnetite is formed during cathodic protection under the calcareous deposit.•Pre-existing corrosion product layers are almost not...

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Bibliographic Details
Published in:Corrosion science 2015-01, Vol.90, p.375-382
Main Authors: Refait, Ph, Jeannin, M., Sabot, R., Antony, H., Pineau, S.
Format: Article
Language:English
Subjects:
A. Steel
B. Raman spectroscopy
C. Cathodic protection
C. Rust
Chemical Sciences
Engineering Sciences
Physics
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Summary:•The corrosion product layer forming in the tidal zone is mainly made up of magnetite.•A thin film of magnetite is formed on the steel surface under cathodic protection.•Magnetite is formed during cathodic protection under the calcareous deposit.•Pre-existing corrosion product layers are almost not modified by cathodic protection. Carbon steel coupons were set in the tidal zone of a French seaport for 7years with or without cathodic protection. The average corrosion rates decreased from 90μmyr−1 to 9μmyr−1 under cathodic protection. The corrosion product layers covering the unprotected coupons, characterized by Raman spectroscopy and X-ray diffraction, were mainly made up of magnetite and Fe(III) oxyhydroxides, with magnetite being clearly predominant. The products of the residual corrosion process under cathodic protection, similar to those observed at open circuit potential, formed a thin layer on the steel surface under the calcareous deposit.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2014.10.035