This paper investigates the long term corrosion behaviour of pretreated carbon steel under alternating anaerobic to aerobic cycles over 238 days. Changes in steel behaviour were observed electrochemically by monitoring the corrosion potential, and calculating changes to corrosion rate from linear polarization resistance. With increasing cycle number the corrosion process becomes localized at a small number of locations, consistent with the formation of tubercles. Periods of aerobic corrosion were associated with more positive potentials (between −500 mV to −350 mV) and high corrosion rates (70 to 120 μm yr−1); whereas anaerobic corrosion yielded more negative potentials (< −650 mV) and lower corrosion rates (40 to 50 μm yr−1). Upon termination of the experiment, corrosion product deposits were characterized by several techniques: scanning electrochemical microscopy to detect morphology; focused ion beam and cross sectioning to judge film thickness and film porosity; and Raman Spectroscopy to identify iron phases.
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2010 8th International Pipeline Conference
September 27–October 1, 2010
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4420-5
PROCEEDINGS PAPER
Long Term Corrosion Behaviour of Carbon Steel During Anaerobic to Aerobic Cycling Under Near-Neutral pH Saline Conditions Available to Purchase
Brent W. A. Sherar,
Brent W. A. Sherar
The University of Western Ontario, London, ON, Canada
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Peter G. Keech,
Peter G. Keech
The University of Western Ontario, London, ON, Canada
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Zack Qin,
Zack Qin
The University of Western Ontario, London, ON, Canada
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Fraser King,
Fraser King
Integrity Corrosion Consulting Ltd., Nanaimo, BC, Canada
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David W. Shoesmith,
David W. Shoesmith
The University of Western Ontario, London, ON, Canada
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Robert G. Worthingham
Robert G. Worthingham
TransCanada Pipelines Ltd., Calgary, AB, Canada
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Brent W. A. Sherar
The University of Western Ontario, London, ON, Canada
Peter G. Keech
The University of Western Ontario, London, ON, Canada
Zack Qin
The University of Western Ontario, London, ON, Canada
Fraser King
Integrity Corrosion Consulting Ltd., Nanaimo, BC, Canada
David W. Shoesmith
The University of Western Ontario, London, ON, Canada
Robert G. Worthingham
TransCanada Pipelines Ltd., Calgary, AB, Canada
Paper No:
IPC2010-31164, pp. 287-295; 9 pages
Published Online:
April 4, 2011
Citation
Sherar, BWA, Keech, PG, Qin, Z, King, F, Shoesmith, DW, & Worthingham, RG. "Long Term Corrosion Behaviour of Carbon Steel During Anaerobic to Aerobic Cycling Under Near-Neutral pH Saline Conditions." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 1. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 287-295. ASME. https://doi.org/10.1115/IPC2010-31164
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