To accurately assess the corrosion risk under dynamic AC interference, the dynamic fluctuation characteristics of the pipeline near high-speed railway were analyzed by field test data. The corrosion rate and morphology of corrosion products under natural corrosion, steady AC interference, and dynamic AC interference were compared, and the effect of AC current density and typical dynamic interference cycle on the corrosion rate of X65 steel were investigated. The results show that the corrosion rates under steady and dynamic AC interference are higher than that under natural corrosion. With the increase of peak AC current density and interference time of each cycle, the dynamic AC corrosion rate increases. When the interference time increases to 350s in each interference cycle, the dynamic AC corrosion rate is equivalent to the steady AC corrosion rate.
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