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Occurrence of anodic current and corrosion of steel in aqueous media under fluctuating cathodic protection potentials

Gupta, R.K., Tan, M.Y.J., Esquivel, J. and Forsyth, M. 2016, Occurrence of anodic current and corrosion of steel in aqueous media under fluctuating cathodic protection potentials, Corrosion: the journal of sicence and engineering, vol. 72, no. 10, pp. 1243-1251, doi: 10.5006/1637.

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Title Occurrence of anodic current and corrosion of steel in aqueous media under fluctuating cathodic protection potentials
Author(s) Gupta, R.K.
Tan, M.Y.J.ORCID iD for Tan, M.Y.J. orcid.org/0000-0002-0765-108X
Esquivel, J.
Forsyth, M.ORCID iD for Forsyth, M. orcid.org/0000-0002-4273-8105
Journal name Corrosion: the journal of sicence and engineering
Volume number 72
Issue number 10
Start page 1243
End page 1251
Total pages 9
Publisher NACE International
Place of publication Houston, Tex.
Publication date 2016-10
ISSN 0010-9312
Keyword(s) cathodic protection
polarization
square wave
steel corrosion
stray current corrosion
Summary Excursion of cathodic protection (CP) potential from the designed "safe" CP level resulting from various forms of electrical interference signals are observed rather frequently in industrial applications, in particular in the pipeline industry; however, the influence of such potential fluctuations on the corrosion behavior of steel under CP conditions does not yet appear to be fully understood. In this work, the effects of anodic transients that periodically shift the potential of a CP protected steel electrode from-1,200 mVAg/AgCl to-750 mVAg/AgCl on the corrosion of a steel electrode in aqueous media was investigated using square wave polarization. Anodic currents were measured that lasted for significant periods of time upon stepping the CP potential up to a less cathodic potential at various frequencies (1 h, 30 s, 10 s, 5 s, and 1 s). Part of such anodic currents is found to cause steel corrosion, and this is explained on the basis of understanding the Fe/H2O equilibrium.
Language eng
DOI 10.5006/1637
Field of Research 091207 Metals and Alloy Materials
030301 Chemical Characterisation of Materials
030604 Electrochemistry
Socio Economic Objective 870302 Metals (e.g. Composites
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, NACE International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30087577

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.