Recent evaluation of corrosion protective paint films by electrochemical methods

The deterioration of coating films has recently been evaluated by electrochemical methods, such as the alternating current (AC) impedance or electrochemical impedance spectroscopy (EIS) method, the current interrupter (CI) method, and the scanning vibrating electrode technique (SVET). Studies on the evaluation of coating films by the AC impedance method are found, especially in papers published from 1990 to 1995. The characteristics of the various electrochemical measurement methods, and a correlation between each electrochemical parameter value and visual observation rating are reviewed. There is a significant correlation between the evaluation by electrochemical measurement and that by visual observation. Guidelines and recent monitoring instruments for an evaluation method are also reviewed. (C) 1997 Elsevier Science S.A.