Anticorrosive property of hexafunctional epoxy polymer HGTMDAE for E24 carbon steel corrosion in 1.0 M HCl: gravimetric, electrochemical, surface morphology and molecular dynamic simulations

The novel hexafunctional epoxy polymer synthesized in our laboratory, namely hexaglycidyl trimethylene dianiline of ethylene (HGTMDAE), has been evaluated as corrosion inhibitor of E24 carbon steel (CS) in the aggressive environment (1.0 M HCl) by using a gravimetric measurements, electrochemical impedance spectroscopy (EIS) and molecular dynamic simulations (MD). However, to better understand information on the surface adsorption mechanism of the CS/HGTMDAE/1.0 M HCl medium, the corrosion protection was investigated by using the scanning electron microscopy. Furthermore, the gravimetric test results showed that the inhibition performance will increase with increasing in the concentration of HGTMDAE to reach a maximum of 90% at concentration 10(-3) M. In addition, the EIS has a better inhibitory efficiency of 95% for the optimal concentration (10(-3) M) of the epoxy polymer HGTMDAE. Moreover, the polarization results indicate that this macromolecular binder acts as a mixed inhibitor. The epoxy polymer formed protective layer on surface of the E24 CS by adsorption according to Langmuir model. The inhibitor adsorption phenomena have been tested through the estimation of kinetics thermodynamic parameters. MD simulations were used to describe the electronic and adsorption properties of epoxy polymer HGTMDAE.