Numerical modelling of buried pipelines under DC stray current corrosion

  • Yaping Zhang College of Science, China University of Petroleum (East China), Qingdao, 266580
  • Qiong Feng College of Science, China University of Petroleum (East China), Qingdao, 266580 Semiconductor Lighting Technology Research and Development Center, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083
  • Lianqing Yu College of Science, China University of Petroleum (East China), Qingdao, 266580
  • Chi-Man Lawrence Wu Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, SAR
  • Siu-Pang Ng Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, SAR,
  • Xiao Tang College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao, 266580
Keywords: Stray current corrosion, numerical modeling, buried pipelines

Abstract

Corrosion of buried pipelines caused by stray currents is becoming a serious industrial and environmental problem. It is therefore necessary to study corrosion mechanisms of buried pipelines under DC stray currents in order to propose effective anti-corrosion measures. Since measurement of the potential is one of important ways to identify stray current intensity, the COMSOL Multiphysics software was used to simulate stray current corrosion dynamics of buried pipelines. It was also used to calculate the distribution and intensity changes of electrolyte potential in the cathodic protected system by solving Laplace’s three-dimensional equation. The obtained results showed that increased applied voltage leads to more positive shift of a pipeline potential, resulting in acceleration of stray current corrosion. On the contrary, increased soil resistivity can retard the corrosion process. The protected pipeline with a sacrificial anode suffers less corrosion interference than unprotected pipeline. Two crossed arrangement of pipelines makes no difference in corrosion of protected pipeline, but affects greatly on unprotected pipeline.

References

L. Bertolini, M. Carsana, Corrosion science 49 (2007) 1056-1068.

I. A. Metwally, H. M. Al-Mandhari, A. Gastli, Z. Nadir, Engineering Analysis with Boundary Elements 31 (2007) 485-493.

A. I. H. Committee, S. D. Cramer, B. S. Covino. Stray-current corrosion in corrosion: Fundamentals, testing and Protection, pp. 95-263, ASM international, 2003.

E. B. Muehlenkamp, M. D. Koretsky, J. C. Westall, Corrrosion 61 (2005) 519-533.

H. Al-Mandhary, I. A. Metwally, Z. Nadir, A. Gastli, A. A. Maqrashi, International Conference on Communi¬cation, Computer & Power, 2007.

I. A. Metwally, A. H. Al-Badi, Materials and Corrosion 61 (2010) 245-251.

R. Strommen, W. Keim, J. Finnegan, et al, Materials Performance 26 (1987) 2-6.

Y. Hong, L. Zuohua, Q. Guofu, Q. Jinping, Construction and Building Materials 157 (2017) 416-423.

Y. S. Kim, G. J. Jeong and H. J. Sohn, Metals and Materials 5 (1999) 93-99.

J. Warkus, M. Raupach, Materials and Corrosion 59 (2008) 122-130.

I. A. Metwally, H. M. Al-Mandhari, Z. Nadir, A. Gastli, European Transactions on Electrical Power 17 (2007) 486-499.

Md. A. Salam, Q. M. Rahman, S. P. Ang, F. Wen, Journal of Modern Power System and Clean Energy, 5 (2017) 290-297.

Published
28-02-2019
Section
Electrochemical Engineering