Abstract
Polycaprolactone (PCL), a non toxic biodegradable polymer has limited application in the field of corrosion. In this study graphene based nanoparticles are incorporated into PCL matrix in order to enhance its anti-corrosion performance. The influence of graphene oxide (GO) and functionalized graphene oxide (FGO) nanosheets on the corrosion protection performance of PCL coating have been investigated. GO was functionalized with 8-bromo-[1,2,4]triazolo[1,5-a]pyridin-2-amine (BTP), and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectroscopy and Energy Dispersive X-ray spectroscopy (EDX). The composite coating mixture consisted of GO/FGO-PCL matrix was applied on mild steel and surface of the coated samples were examined using Contact Angle technique, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). Barrier and corrosion protection performance of the coated samples were studied using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods in 3.5% NaCl medium. The results showed that FGO-PCL coating exhibit superior barrier and anti-corrosion properties by improving the dispersion and exfoliation of FGO in the PCL matrix. It is found that the incorporation of FGO nanosheets make PCL more hydrophobic and also provides additional adhesion strength to the polymer.
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