Effects of Soil Type of Shanghai and Electrode Potential on Near-Neutral pH Stress Corrosion Cracking of Pipeline Steel X60

Abstract:

The effects of soil type of Shanghai and electrode potential from cathodic protection point on near-neutral pH stress corrosion cracking (SCC) behavior of pipeline steel X60 has been investigated for structural integrity assessment. The SCC behavior was evaluated through slow strain rate tests (SSRT) at various electrode potentials in three solutions containing different typical soils. Results showed that the SCC susceptibility generally increased with decreasing electrode potential in all the three environments, with quick increase happening in the range from-1500 to-700mV(SCE). It is suggested that hydrogen induced cracking should dominate the SCC at low potentials. In cathodic potential range, the rank of the SCC susceptibility for soil type was Near-city soil > Cyan-purple soil > Cyan-yellow soil. In anodic potential range, SCC susceptibility curves mixed each other in the three solutions.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 1116-1119
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.1116
• Online since: June 2014
• Authors: Guang Fu Li*, Da Feng Yan
• Keywords: Electrode Potential, Near-Neutral pH Stress Corrosion Cracking, Pipeline Steel, Soil Type, X60

References

[1] R. N. Parkins, A review of stress corrosion cracking of high strength gas pipelines, Proceedings of CORROSION/2000, NACE International, Houston, 2000, Paper No. 00363.

[2] W. Chen, F. King, T.R. Jack, and M.J. Wilmott, Environmental aspects of near-neutral pH stress corrosion cracking of pipeline steels， Metall. Mater. Trans. 33A (2002) 1429-1436.

DOI: 10.1007/s11661-002-0066-9

[3] J.A. Beavers, C.L. Durr, D.M. Delanty, and R.L. Sutherby, Near-neutral pH SCC in susceptible soil environments , Proceedings of CORROSION/2001, NACE International, Houston , 2001, Paper No. 01217.

[4] J.A. Beavers and W.V. Harper, Stress corrosion cracking prediction model, Proceedings of CORROSION/2004, NACE International, Houston, 2004, Paper No. 04189.

[5] GUO Hao，LI Guangfu，CAI Xun，ZHOU Jianjiang，YANG Wu, SCC Behaviour of X-70 Pipeline Steel in Near-Neutral pH Solutions， J. Materials Science and Technology, 21（ 2005）33-38.

[6] GUO Hao，LI Guangfu，CAI Xun，YANG Ruipeng, YANG Wu. Effect of cyclic loading on SCC Behaviour of X-70 Pipeline Steel in Near-Neutral pH Solutions, Journal of Materials Science and Technology，21(2005)459-464.

DOI: 10.4028/www.scientific.net/kem.297-300.2501

[7] R. N. Parkins, , Stress corrosion cracking, Uhlig's Corrosion Handbook, Second Edition, Edited by R. Winston Revie, New York etc, John Wiley & Sons, Inc., 2000, pp.191-204.