Numerical simulation of stray current corrosion of buried steel pipeline under cathodic protection

Xiaolong Li; Xiao Li; Xuyun Yang; Tao Meng; Renyang He; Nan Lin

doi:10.1117/12.3034294

5 July 2024 Numerical simulation of stray current corrosion of buried steel pipeline under cathodic protection

Xiaolong Li, Xiao Li, Xuyun Yang, Tao Meng, Renyang He, Nan Lin

Proceedings Volume 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024); 1318304 (2024) https://doi.org/10.1117/12.3034294
Event: The 3rd International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 2024, Wuhan, China

Abstract

Stray current corrosion has become one of the important reasons for corrosion failure of buried steel pipelines. In this paper, based on Comsol Multiphysics software, the influence of stray current on the corrosion of buried steel pipes under cathodic protection was simulated and analyzed, and the influence of leakage voltage, soil conductivity, pipeline buried depth and other factors on the cathodic protection potential was analyzed. The simulation results show that under the action of -1V cathodic protection, when the leakage voltage exceeds 10V, the interference degree of stray current is very strong, and the cathodic protection is likely to fail. Under cathodic protection, soil average current density was positively correlated with soil conductivity under a certain leakage voltage. With the increase of burial depth, the positive shift of pipeground potential decreases and gradually returns to the cathodic protection potential level. Therefore, the buried range greater than 1.5m is determined within the allowable range of field technology and economy, and the combination of cathodic protection can better prevent stray current corrosion interference. The research in this paper has important guiding significance for further understanding of stray current corrosion mechanism of buried steel pipelines.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaolong Li, Xiao Li, Xuyun Yang, Tao Meng, Renyang He, and Nan Lin "Numerical simulation of stray current corrosion of buried steel pipeline under cathodic protection", Proc. SPIE 13183, International Conference on Optoelectronic Information and Functional Materials (OIFM 2024), 1318304 (5 July 2024); https://doi.org/10.1117/12.3034294

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KEYWORDS

Corrosion

Pipes

Electrical conductivity

3D modeling

Numerical simulations

Oxygen

Electrodes

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