Corrosion and Protection of Buried Metal Pipelines Based on Stray Current

Simulation test in laboratory was carried out to study the impact of stray current produced by DC transportation system on buried metal pipelines. The measures such as coating protection, stray current collection network, sacrificial anode protection, current drainage and bridging protection were taken to mitigate or eliminate stray current corrosion of buried metal pipelines effectively. The results show that using these protective measures can bring certain remission to corrosion problems caused by stray current, among which drainage and bridging protection had the best effect. However, in practical construction process, single measure has certain limitation, so it is necessary to comprehensively consider the intensity of stray current and the situations of other pipelines, and take protective measures flexibly and effectively.