Abstract
The corrosion behavior of X80 steel in the presence of coupled coating defects was simulated and studied under the interference of alternating current (AC) in an alkaline environment. The results from electrochemical measurements showed that the electrode potential of the coating defect with the smaller exposed area was lower than that with the larger area, which indicated that the steel with the smaller coating defect was more prone to corrosion. The result of weight loss tests also showed that the smaller coating defect had induced a higher corrosion rate. However, the corrosion rate of X80 steel at the larger coating defect decreased gradually with the increase of the larger defect area at a constant smaller defect area. The corrosion morphology images showed that the coating defects with smaller areas suffered from more severe pitting corrosion.
Highlights
Given the increasing demand for energy, electric power and electrified railways, many pipelines are being buried in parallel or are intersecting with feeder cables and subway rails [1,2,3]
The effect of a coupled coating defects on the corrosion potential and corrosion rate of X80 pipeline steel at the coating defects was studied under alternating current (AC) interference, and the following of X80 pipeline steel at the coating defects was studied under AC interference, and the following conclusions were obtained: conclusions were obtained: (1) The open circuit potential of the X80 steel specimen with a smaller coating defect area was lower
(1) The open circuit potential of the X80 steel specimen with a smaller coating defect area was lower than those with larger coating defects. This result showed that the specimen with the smaller than those with larger coating defects. This result showed that the specimen with the smaller coating defect was more prone to corrosion
Summary
Given the increasing demand for energy, electric power and electrified railways, many pipelines are being buried in parallel or are intersecting with feeder cables and subway rails [1,2,3]. This pipeline configuration is significantly distinct from the alternating current (AC)-induced corrosion of pipelines [4,5,6,7]. Research on the mechanism of metal corrosion affected by AC and the relevant corrosion mitigation methods are significantly important
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