A new coating based on epoxy containing polyindole doped by indole-3 butyric acid from protection anticorosion of carbon steel

Abstract

This study is focused on the synthesis ofa polyindole doped by indole-3 butyric acid (PI-IBA). IR analyze indicated that the linkage positions of indole involves the position 2 and 3 of the monomer and the insertion of IBA in the polymer backbone. Polyindole IBA doped was incorporated into epoxy resin for protection anticorrosion of carbon steel. The electrochemical impedance. measurements show a significantly improvement of protective properties in presence of PI-IBA in comparison with pure epoxy and epoxy containing polyindole coating. The local electrochemical impedance measurements show the seif healing capacity of coating containing PI-IBA. In this case. this conducting polymer acts as a smart paint releasing inhibitors on demand by the redox reaction between polyindole and metal surface