Influence of electron releasing groups in benzylidene thiocarbohydrazide and their synergistic effect with iodide ions on acidizing corrosion inhibition of carbon steel in 15% HCl solution - Experimental and theoretical approach

Abstract

Influence of electron releasing groups in benzylidene thiocarbohydrazide and their synergetic effect with iodide ions on acidizing corrosion inhibition of carbon steel in 15% HCl using chemical and electrochemical methods has been studied. Tafel polarization measurements indicate that these compounds act as mixed-type inhibitors. The adsorption of these compounds obey Langmuir adsorption isotherm and the thermodynamic parameters are also calculated to explain their inhibitive action. The increase in synergism parameter (S_θ) indicates that the inhibition efficiency is improved in the presence of the iodide ions. Further, the density functional theory is used to validate the experimental results.