The coating disbondment and corrosion of a X65 pipeline steel under coating were studied by scanning Kelvin probe (SKP) measurements. The effects of immersion time and wet-dry cycle on the Kelvin potential profile and the corrosion behavior of the steel were investigated. Kelvin potential measured on “intact” area is shifted negatively with time, indicating an increasing water uptake under the “intact” coating. There is a more negative Kelvin potential on disbonded area than that on “intact” area, which is attributed to corrosion reaction of steel occurring under the disbonded coating. During wet-dry cycle, the thickness of solution layer trapped under disbonded coating decreases due to evaporation of water, causing a negative shift of Kelvin potential. It is associated with the reduction of oxygen solubility in the concentrated solution during drying of electrolyte.
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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
Monitoring of Coating Disbondment by a Scanning Kelvin Probe Technique
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:
IPC2010-31659, pp. 983-986; 4 pages
Published Online:
April 4, 2011
Citation
Fu, AQ, & Cheng, YF. "Monitoring of Coating Disbondment by a Scanning Kelvin Probe Technique." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 1. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 983-986. ASME. https://doi.org/10.1115/IPC2010-31659
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