Mechanisms of AC assisted corrosion of pipelines under cathodic protection (CP), and CP criteria for its mitigating remain still subjects of controversy. This paper presents a critical review of the fundamental understanding of the AC assisted corrosion phenomenon and also some laboratory investigation; such as the analysis of corrosion products obtained under carefully controlled AC corrosion tests using Raman spectroscopy, simultaneous recording of potential and current, and separation of this experimental overall current into its faradic and charging of the double layer capacitance contributions. For the latter, a simplified equivalent circuit model of the steel / solution interface, taking account of the interfacial and transport phenomenon was used. Results obtained are discussed: • to highlight the effect on corrosion rate and corrosion feature, of some critical parameters namely AC current density, AC voltage amplitude, CP level, soil resistance between the coating defect and remote earth, and development of iron oxide layers; • to devise some aspects on the mechanistic view of the phenomenon; and • to comment on the CP criteria currently in use, with a special focus on the dependency of CP protection level with AC current density and voltage amplitude.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4858-6
PROCEEDINGS PAPER
On the Mechanism of AC Assisted Corrosion of Buried Pipelines and Its CP Mitigation Available to Purchase
I. Ibrahim,
I. Ibrahim
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
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B. Tribollet,
B. Tribollet
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
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H. Takenouti,
H. Takenouti
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
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S. Joiret,
S. Joiret
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
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H.-G. Scho¨neich
H.-G. Scho¨neich
EON-Rurhgas AG, Essen, Germany
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I. Ibrahim
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
M. Meyer
Gaz de France R&D, Saint Denis, France
B. Tribollet
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
H. Takenouti
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
S. Joiret
Universite´ Pierre et Marie Curie, Ivry-sur-Seine, France
S. Fontaine
GRTGaz, Compie`gne, France
H.-G. Scho¨neich
EON-Rurhgas AG, Essen, Germany
Paper No:
IPC2008-64380, pp. 601-625; 25 pages
Published Online:
June 29, 2009
Citation
Ibrahim, I, Meyer, M, Tribollet, B, Takenouti, H, Joiret, S, Fontaine, S, & Scho¨neich, H. "On the Mechanism of AC Assisted Corrosion of Buried Pipelines and Its CP Mitigation." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 2. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 601-625. ASME. https://doi.org/10.1115/IPC2008-64380
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