Effect of AC interference on the corrosion behavior of cathodically protected mild steel in an artificial soil solution. Part I: Investigation on formed corrosion product layer

AC‐induced corrosion is a big threat even for cathodically protected pipelines nowadays. While this phenomenon was intensively investigated in the last decades, the corrosion mechanisms due to AC interference remain unclear. In the present work, investigations on the surface processes on cathodicall...

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Bibliographic Details
Published in:Materials and corrosion 2022-01, Vol.73 (1), p.45-54
Main Authors: Markić, Mario, Arat, Serkan, Fürbeth, Wolfram
Format: Article
Language:English
Subjects:
AC corrosion
Cathodic protection
Corrosion
Corrosion effects
Corrosion mechanisms
Corrosion products
Electron probe microanalysis
EPMA
Interference
Low carbon steels
Parameters
Polarization
Raman spectroscopy
SEM
Soil investigations
Thickness
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Summary:AC‐induced corrosion is a big threat even for cathodically protected pipelines nowadays. While this phenomenon was intensively investigated in the last decades, the corrosion mechanisms due to AC interference remain unclear. In the present work, investigations on the surface processes on cathodically protected mild steel during AC polarization have been performed. They utilized high‐speed potential measurements that have demonstrated the influence of the polarization parameters on the resulting alternating voltage. The corrosion product layer was characterized with scanning electron microscopy, electron probe microanalysis, and Raman spectroscopy, which clearly show the effect of the parameters of the applied alternating current on the surface under different cathodic protection (CP) conditions. It was demonstrated that the properties of the formed corrosion product layer, meaning the layer thickness, amount of oxygen, and so on, is not only dependent on the AC polarization parameters but also on the CP potential itself. Investigations on the surface processes on cathodically protected mild steel during AC polarization have been performed. They utilized high‐speed potential measurements that have demonstrated the influence of the polarization parameters on the resulting alternating voltage. It was demonstrated that the properties of the formed corrosion product layer are not only dependent on the AC polarization parameters but also on the CP potential itself.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.202112640