The influence of direct stray current on the corrosion performance of buried oil pipeline

DOI

10.2991/imst-16.2016.76How to use a DOI?

Keywords

Mg sacrificial anode; Q235 steel; electrode potential; stray current.

Abstract

In order to investigate the protect effect of Mg sacrificial anode on the pipeline with interference of DC stray current along the length direction, we simulated field condition that Mg sacrificial anode was equipped at 4-meter intervals when Q235 pipeline (40 meters long) buried into soil with resistivity of 324 úm was subjected to 2~10V DC potential. When the voltage of DC power was in a range of 2 to 10V, the field test showed that the potential of the part of 0-4 meters at the positive electrode was decreased from 2.8V to 0.45V; the potential of the part of 40-36 meters at the negative electrode increased from -1.75V to -0.9V; the potential of the part of 0~36 meters was higher than the self-corrosion potential of the Q235 steel. Thus the DC stray current accelerate the corrosion of underground equipment. The potential of Mg sacrificial anode near the positive electrode increased from -1.471V to 1.25V, which caused significantly consumption of sacrificial anode. Besides, the Mg sacrificial anode potential was higher than Q235 steel pipeline from the 4-meter to the 36-meter, so the Mg sacrificial anode cannot be used for protection to Q235 steel.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Lajun Feng
AU  - Jiaan Xiao
AU  - Feifei Huang
AU  - Bo Deng
PY  - 2016/11
DA  - 2016/11
TI  - The influence of direct stray current on the corrosion performance of buried oil pipeline
BT  - Proceedings of the 2016 International Conference on Innovative Material Science and Technology (IMST 2016)
PB  - Atlantis Press
SP  - 516
EP  - 521
SN  - 1951-6851
UR  - https://doi.org/10.2991/imst-16.2016.76
DO  - 10.2991/imst-16.2016.76
ID  - Feng2016/11
ER  -