Abstract
In this paper, the effect of alternating stray current (AC) density on the corrosion behavior of X80 steel under disbonded coating was studied by electrochemical methods, wire beam electrode (WBE) technology, and surface observation technology. The results showed that under the interference of different AC densities, the corrosion potential of X80 steel under disbonded coating underwent negative deviation, and the degree of negative deviation increased with the increase of AC density. The corrosion current density of X80 steel under disbonded coating with the action of 0~100 A/m2 AC density had few differences. While the corrosion current density of X80 steel with the action of 200~300 A/m2 AC density increased and the corrosion current density was higher than that under low AC density. The cathode area of the wire beam electrode under disbonded coating is mainly distributed outside and the edge of the gap between disbonded coating and X80 steel, while the anode area is mainly distributed inside the gap.
Highlights
At present, the most common anticorrosion measure of buried pipeline was the combination of anticorrosion coating and cathodic protection
The results showed that the high-temperature environment promoted the negative movement of the self-corrosion potential of the metal, which increases the probability of crevice corrosion of 2Cr13 SO42- on steel
The results showed that when the concentration of
Summary
The most common anticorrosion measure of buried pipeline was the combination of anticorrosion coating and cathodic protection. Domestic and foreign scholars had relatively little research on the influence of different AC stray current density on the corrosion of metal under the peeling coating defect. Studying the influence of different stray current densities on the corrosion behavior of the metal under the stripping coating was of great significance for the actual safe operation of the pipeline. By analyzing the Eocp of X80 steel, the corrosion current density, and the potential current at different positions of the array electrode, the effects of different AC current intensity interference on the corrosion rate of X80 steel and the distribution of cathode and anode regions under the defect of peeling coating were studied, in order to provide a certain theoretical basis for practical engineering applications
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