With rapid development of the economy, more and more power transmission, railway systems and oil/gas pipelines have been constructed in recent years. There have been many cases of pipelines crossing or paralleling to adjacent high-voltage transmission lines or railways. Corrosion problem of buried pipelines caused by AC or DC interference is increasingly prominent and has received increasing attention.

In this work, An AC interference corrosion simulation experimental device was constructed for coating disbonded pipeline, and micro-electrode technology was used to study the local corrosion characteristics of X80 pipeline steel under AC interference. Corrosion behavior of X80 pipeline steel under stray current interference is investigated in the crevice cell. The results show that the electrochemical activity of X80 steel surface is enhanced under the interference of alternating current: alternating current causes negative potential deviation of pipeline steel. With the increase of AC density, the anodic dissolution rate of X80 steel increases, and the corrosion pattern at the damage point of the coating gradually changes from uniform corrosion to local corrosion. Influence of stray current interference on corrosion behavior of pipeline steel under the coating defect was discussed from aspects of the commutation effect of AC interference, the irreversibility of anode reaction and effect of AC on the double layer structure at steel/solution interface. The most serious corrosion area of X80 pipeline steel under the interference of alternating current occurs at the open damage point, and the corrosion degree of the stripping area is slightly reduced. However, when 100 A/m^2^ alternating current is applied, there are still serious pitting pits on the surface of X80 steel deep in the stripping area.


Corrosion Behavior of Pipeline Steel With Stray Current Interference at Coating Defects

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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