Corrosion processes on cathodically protected pipelines with superimposed AC voltage (AC corrosion) and derivation of protective

IGF 20273 N

Bild Forschungsprojekt
Period:  01.10.2018 - 31.03.2021
Funder:  AiF
Project Manager:  M.Sc. Mario Markic
Research Group:  Corrosion

Aim of the project

Buried pipelines are protected against corrosion by a combination of organic coatings and cathodic corrosion protection. Despite long experience, corrosion damage occurs where pipelines are positioned parallel to AC-power lines and thereby AC-interference is overlapping with cathodic protection DC-current. The resulting AC-corrosion may lead to perforation of cathodically protected pipelines and endangering their integrity. This phenomenon has been known for a long time, but it is gaining importance due the energy transition that necessitates the construction, expansion or increase in the capacity of high-voltage overhead lines. Since it is commonly to form energy passages with longer parallel guidance of high-voltage power lines and buried pipelines, there is an increase in the influence of alternating current on the buried installations. The theories on AC-corrosion have so far been established on a purely phenomenological and thermodynamic basis. Therefore some explanatory gaps still exist and generally accepted mechanism is present. The recently derived application guidelines are thus not scientifically proven and uncertain in applicability. Furthermore, they are difficult to implement in practice by the pipe network operators and the companies (especially SME) because compliance with the protection criteria under AC-stress often conflicts with traditional soil corrosion protection arrangements. The aim of this project is therefore to develop a solid model for explaining all mechanisms of AC-corrosion. Based on this model, the operators and installation companies will then be provided with arrangements for the protection of cathodically protected installations against AC-corrosion and measuring methods for better detection of potential danger for such installations can be developed.


Hinweis Grafik

Das IGF-Vorhaben Nr. IGF 20273 N der Forschungsvereinigung GfKORR - Gesellschaft für Korrosionsschutz e.V. wird über die AiF im Rahmen des Programms zur Förderung der industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium für Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages gefördert.

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