直流干扰下腐蚀的判断

Judgement of Corrosion in Direct Current Interference

采用瞬间断电法,得到管/地通电、断电电位曲线,初步判断某管道存在直流杂散电流干扰腐蚀。结合现场调研,确定直流干扰源为地铁2号线。对现场进行开挖验证,进一步断定管道存在地铁直流干扰腐蚀,同时分析了地铁直流干扰的腐蚀原理。

By using instantaneous power method to obtain the pipe/ground potential curve in interval tests, direct current （DC） stray current corrosion was assessed to happen in certain pipe. Combined with field investigation, the DC interference sources were determined to be metro line 2. With the help of excavating and checking, the subway DC interference corrosion was further confirmed. Besides, the subway DC interfer- ence corrosion mechanism was analyzed.