The alternating current (AC)-induced corrosion of a cathodically protected X65 pipeline steel was studied in a high pH, concentrated carbonate/bicarbonate solution. Results demonstrated that the corrosion rate of the steel increases with the AC current density, and AC interference could increase the pitting corrosion of the steel. In the absence of AC interference or at a low AC current density, i.e., 20 A/m2, a cathodic protection (CP) potential of −950 mV(Cu/CuSO4 electrode, CSE), which is 100 mV more cathodic than −850 mV(CSE) recommended by National Association of Corrosion Engineers (NACE), provides a full protection over the steel. When the AC current density is higher than 20 A/m2, the NACE-recommended CP is incapable of protecting the pipeline from corrosion. A new CP standard is thus developed for recommendation to industry to avoid AC corrosion of pipelines.
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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
Corrosion of Pipeline Steel in the Presence of Alternating Current and the New CP Recommendation Available to Purchase
A. Q. Fu,
A. Q. Fu
University of Calgary, Calgary, AB, Canada
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Y. F. Cheng
Y. F. Cheng
University of Calgary, Calgary, AB, Canada
Search for other works by this author on:
A. Q. Fu
University of Calgary, Calgary, AB, Canada
Y. F. Cheng
University of Calgary, Calgary, AB, Canada
Paper No:
IPC2010-31658, pp. 977-981; 5 pages
Published Online:
April 4, 2011
Citation
Fu, AQ, & Cheng, YF. "Corrosion of Pipeline Steel in the Presence of Alternating Current and the New CP Recommendation." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 1. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 977-981. ASME. https://doi.org/10.1115/IPC2010-31658
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