Preliminary studies have been performed aimed at the application of EIS techniques to the monitoring of coating integrity in buried pipelines. Electrochemical techniques are promising for the investigation of coating condition in large components, since they are non destructive and little
perturbative. On the other hand, the selection of accurate models is of importance for data reduction and for the understanding of the obtained results. In literature, experimental studies and models are available for application to the case of rebar embedded in concrete. The present work was aimed at designing an experimental program to apply electrochemical techniques to large buried pipelines, using the cathodic protection system as a tool for obtaining impedance spectra
Kevwords: Buried pipelines, Coating defect, Coating disbonding, Electrochemical Impedance Measurements, Resistance, Coating Integrity Monitoring.