Comparison of ENM, EIS and DC resistance for assessing and monitoring anti-corrosive coatings

This paper provides a brief review of the (mainly in-situ) electrochemical methods that have been applied to coatings to assess corrosion protection ability. It discusses particularly the electrochemical noise measurement (ENM) which although still being developed has shown considerable promise as a method for assessing coatings in a laboratory situation. Results are presented and compared with results from other electrochemical methods particularly electrochemical impedance spectroscopy (EIS). The challenge of how best to apply ENM and other methods to monitoring in a practical situation is addressed