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Study of criterion for assuring the effectiveness of cathodic protection of buried steel pipelines being interfered with alternative current
Author(s) -
He X.,
Jiang G.,
Qiu Y.,
Zhang G.,
Jin X.,
Xiang Z.,
Zhang Z.,
Tang H.
Publication year - 2012
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201006036
Subject(s) - cathodic protection , pipeline transport , current (fluid) , pipeline (software) , current density , line (geometry) , direct current , interference (communication) , corrosion , materials science , transmission line , electrical engineering , metallurgy , environmental science , voltage , engineering , chemistry , environmental engineering , mathematics , electrochemistry , physics , mechanical engineering , electrode , geometry , quantum mechanics , channel (broadcasting)
Abstract Interference of alternative current (AC) on corrosion of X65 steel was investigated in soil. It was observed that the unfavorable effect of interfering AC was able to be effectively inhibited by increasing the direct current density of the cathodic protection (CP) system. A clear correlation was established between the CP current density and the tolerable AC current density. This led to a new criterion for assuring the effectiveness of CP of buried pipelines being interfered with AC. Field experimental results on a buried pipeline running below a 500 kV transmission line showed that the criterion could satisfactorily predict the risk of AC interfering on the CP system.