The adhesion and inhibitor properties of organic coatings investigated with very thin polymer films on noble metal electrodes

Abstract

The electrochemical impedance and the rate of faradaic reactions are measured on platinum electrodes coated with very thin (≈10 −5 cm) acrylonitrile glow-discharge polymer films. The desorption of the organic matrix from the metal surface after immersion into the aqueous 1 M H 2SO 4 is determined quantitatively. The rate of electrocatalytic charge-transfer reactions is directly proportional to the number of unblocked metal surface atoms as determined from the hydrogen adsorption capacitance. The relevance of such measurements for technical protective coatings is pointed out.