Abstract
The anticorrosive effect of an epoxy resin (DGEDDS-MDA) based on diglycidyl ether 4, 4'-dihydroxydiphenylsulfone (DGEDDS) and 4,4'-Methylene dianiline (MDA) with and without titanium dioxide (TiO2) for carbon steel (CS) corrosion in 3% NaCl solution is reported. The composite of DGEDDS-MDA with TiO2 is designated as DGEDDS-MDA-TiO2. Electrochemical and computational techniques were used to demonstrate the anticorrosive effectiveness of the DGEDDS-MDA and its TiO2 composite. The effect of UV irradiation (for 2000 h) on effectiveness of DGEDDS-MDA and its TiO2 composite showed that the presence of the TiO2 appreciably enhanced the corrosion inhibition effect of DGEDDS-MDA. In order to reinforce the experimental findings, reactivity of DGEDDS-MDA with metallic surface was also studied using computational techniques. DFT study revealed that DGEDDS-MDA interacts strongly with metal surface using donor-acceptor mechanism. Polar functional groups (-OH & -N-) and aromatic rings act as adsorption centers. MD simulations study showed that DGEDDS-MDA adsorbs using flat orientation and its orientation is greatly affected by TiO2. (c) 2020 Elsevier B.V. All rights reserved.