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The on-site inspection and buried coupon experiments were conducted on two long-distance pipelines running parallel to high-voltage transmission lines. The investigation revealed that pipeline 1 has a parallel distance to the transmission line of less than 400 m, with a parallel length of approximately 17.5 km, while pipeline 2 has a parallel distance of less than 100 m, with a parallel length of about 3 km. Five locations of the two pipelines were selected to buried corrosion coupons, and the AC and DC parameters of the pipelines were monitored continuously for 24 h. After three months, the corrosion morphology, corrosion products and corrosion rate of the specimens were obtained. The correlation between AC interference parameters, cathodic protection parameters, and corrosion behavior was futher analyzed. The results show that the self-corrosion rate of the test specimen is higher than 0.1 mm/y under acidic soil environment. For the AC interference coupons, when the AC current density is higher than 200A/m2, the corrosion rate of the coupons is higher than 0.1 mm/y under any cathodic protection potential. In high soil resistivity environment, when the AC current density of the coupons is less than 30 A/m2 and the cathodic protection potential is negative to −0.7 VCSE, the corrosion rate is lower than 0.03 mm/y.

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Study on the Relationship Between AC Interference Levels and Corrosion Rates of Buried Pipelines Though Buried Coupon Tests

  • 会议论文

  • 发表日期：

    2026年

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  • Chunyu Wang,
  • Xinling Liu,
  • Hang Yu,
  • Chang Lu,
  • Le Chen,
  • Yanxia Du

摘要

The on-site inspection and buried coupon experiments were conducted on two long-distance pipelines running parallel to high-voltage transmission lines. The investigation revealed that pipeline 1 has a parallel distance to the transmission line of less than 400 m, with a parallel length of approximately 17.5 km, while pipeline 2 has a parallel distance of less than 100 m, with a parallel length of about 3 km. Five locations of the two pipelines were selected to buried corrosion coupons, and the AC and DC parameters of the pipelines were monitored continuously for 24 h. After three months, the corrosion morphology, corrosion products and corrosion rate of the specimens were obtained. The correlation between AC interference parameters, cathodic protection parameters, and corrosion behavior was futher analyzed. The results show that the self-corrosion rate of the test specimen is higher than 0.1 mm/y under acidic soil environment. For the AC interference coupons, when the AC current density is higher than 200A/m2, the corrosion rate of the coupons is higher than 0.1 mm/y under any cathodic protection potential. In high soil resistivity environment, when the AC current density of the coupons is less than 30 A/m2 and the cathodic protection potential is negative to −0.7 VCSE, the corrosion rate is lower than 0.03 mm/y.