Synergistic effect of graphene polyindole nanocomposite for enhanced corrosion protection of aqueous coating in 3.5% NaCl solution for low carbon steel

Abstract

AbstractGraphene polyindole (Gr@PIn) nanocomposite with varying content of graphene was synthesized via an in‐situ redox polymerization doping technique. The techniques like FT‐IR, XRD, SEM, and TEM were utilized to characterize the produced nanocomposites. The produced nanocomposites were cast on LCS (low carbon steel) substrate employing NMP as a solvent, 10% epoxy as a binder, and triethylenetetramine as a curing agent. The anti‐corrosion ability of the Gr@PIn nanocomposite coatings was established by performing corrosion tests such as OCP, EIS, PDP measurements, Salt spray test, and Wettability test. Gr@PIn coating was observed as an effective anti‐corrosion coating for LCS substrate in 3.5 wt.% NaCl. The anticorrosion behavior of coating was dependent on graphene content; the higher content of graphene providing higher protection. The anticorrosion performance of Gr@PIn nanocomposite coating was also compared with that of Polyindole (PIn) coating and bare steel.