Protection-failure mechanism of alkalinization and cathodic protection focusing on coating/metal interfaces

Abstract

Electrochemical impedance spectroscopy is a more rapid and convenient method for evaluating the anti-corrosion performance of the coatings, especially for the analysis of the evolution of water diffusion. However, due to the limitation of the coating/metal interfaces, the electrochemical reaction at interfaces has still not cleared. Therefore, focusing on coating/metal interfaces, in this paper, the protection-failure mechanism of two methods including alkalinization and cathodic protection for anti-corrosion at interfaces is also discussed.