Electrical Corrosion Law of DC Stray Current on Buried Pipelines and Discharge Mea-sures
With the continuous development of industrialization,the interference of DC stray current on buried pipelines by rail transit has become increasingly severe.In order to reduce the electrical corro-sion problem caused by stray current,based on the monitoring of potential along the buried pipeline,the influence of interference law,interference frequency,and interference source location on the pipe-line is analyzed,the current inflow and outflow law is investigated,and the effects of different dis-charge measures are tested.The results show that the interference law is consistent with the operating state of the rail transit,and the interference frequency is consistent with the departure time interval.The closer the distance to the interference source,the larger the time proportion of positive potential devia-tion,the corrosion trend is much larger than that of other pipe segments.Different time periods at the same position may be current inflow and outflow segments,and the current flow direction and law change dynamically with time.Forced discharge has the best effect,followed by polar discharge and ground discharge,while cathodic protection has a poor effect.Through multiple joint protection,except for the pipe segment closest to rail transit,the other pipe segments have achieved good protection effect,the corrosion rate is greatly reduced,and the pipeline replacement and leakage cavitation are reduced.
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