New Cathodic Protection Potential Criterion under AC Interference Condition

AC can disrupt the normal operation of buried pipeline cathodic protection (CP) system.The new metal buried pipeline CP criterion under condition of AC interference was studied by using laboratory simulate device.The results showed that the corrosion could inhibitd by enhancing the cathodic protection potential under AC interference condition.Generally,the bigger the AC interference voltage was,the lower the CP potetial should be.Under the condition of -1200 mV (CSE) CP potential,the CP current was stable.