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The Impact of AC and High DC Potentials on Buried Pipelines: Coating Degradation, Corrosion, and Emerging Challenges
As global energy demands surge and HVAC transmission capacities increase through reconductoring and other advancements, the integrity of buried metallic pipelines faces significant threats. Induced alternating current (AC) and high direct current (DC) potentials in pipelines—often caused by proximity to high-voltage power lines—pose complex challenges to cathodic protection systems and pipeline coatings. These currents can lead to coating degradation phenomena such as undercutting, shielding, pH changes, and accelerated corrosion, compromising long-term pipeline integrity.
