Corrosion Characteristics of X70 Steel Under AC-DC Mixed Interference

doi:10.11885/j.issn.1674-5086.2023.07.31.01

Abstract

Abstract: In certain areas, the cross or parallel installation of oil and gas pipelines, high-voltage transmission lines, and electrified railways creates the risk of AC-DC mixed interference corrosion in buried pipelines. Through electrochemical tests, combined with polarized light microscopy, three-dimensional optical microscopy, and XRD, the AC-DC mixed interference corrosion characteristics of X70 steel in the intersection area of electrified railways, high-voltage transmission lines, and natural gas pipelines were studied. The results show that: 1) the critical current density under AC-DC mixed interference is 120 A/m$^2$; 2) there is no positive correlation between the radius of capacitive reactance arc and current density under AC-DC mixed interference; 3) the AC-DC mixed interference anode area not only continued the corrosion intensity of DC interference, but also played the role of AC oscillation and pitting, resulting in secondary local damage in the corrosion pit, forming a large number of pitting and crevices, and gradually showing the phenomenon of etching which makes the partially corroded X70 steel (partially covered with a corrosion product film) unsupported and exfoliated in solution; 4) at the current density of 180 A/m$^2$, the corrosion depth of the specimen under AC-DC mixed interference reaches 250 μm.

Key words: stray current corrosion, AC-DC mixed interference, X70 steel, etching, synergistic effect

CLC Number:

HE San, YU Rui, ZHANG Jianxiong, LI Bin, XU Huilan. Corrosion Characteristics of X70 Steel Under AC-DC Mixed Interference[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 164-174.

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