Effect of alternating current on cathodic protection on pipelines
Effect of alternating current on cathodic protection on pipelines
- New search for: Xu, L.Y.
- New search for: Su, X.
- New search for: Cheng, Y.F.
- New search for: Xu, L.Y.
- New search for: Su, X.
- New search for: Cheng, Y.F.
In this work, the effects of alternating current (AC) on the performance of cathodic protection (CP) and the CP potential readings were investigated on a 16Mn pipeline steel in a simulated soil solution. The presence of AC interference decreases the CP effectiveness to protect the steel from corrosion. Only when CP potential is sufficiently negative, the steel is under a complete protection even when the AC current density is 400 A/m². Moreover, the AC would shift CP potential from the designed value. The effect of AC on the CP performance depends on the cathodic potential applied on the steel. Under a mild CP potential, e.g., -0.85 V(SCE), the AC would shift the DC potential of the steel negatively, increasing the steel corrosion. When the CP potential is sufficiently negative, e.g., -1 V(SCE), the DC potential of the steel is shifted positively, but the AC application would not be able to affect the steel corrosion at a detectable level. The effect of AC on the CP performance depends on the cathodic potential applied on the steel. Discussed the potential shift of CP applied galvanostatically or potentiostatically.
Document information
Effect of alternating current on cathodic protection on pipelines
Einfluss von Wechselstrom auf den kathodischen Schutz von Pipelines
Corrosion Science ; 66 ; 263-268
2012
6 Seiten, 7 Bilder, 25 Quellen
Article (Journal)
English
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