DFT and Monte Carlo simulation were performed on three Schiff bases namely, 4-(4-bromophenyl)-N'-(4-methoxybenzylidene)thiazole-2-carbohydrazide (BMTC), 4-(4-bromophenyl)-N'-(2,4-dimethoxybenzylidene)thiazole-2-carbohydrazide (BDTC), 4-(4-bromophenyl)-N'-(4-hydroxybenzylidene)thiazole-2-carbohydrazide (BHTC) recently studied as corrosion inhibitor for steel in acid medium. Electronic parameters relevant to their inhibition activity such as E-HOMO, E-LUMO, Energy gap (Delta E), hardness (eta), softness (sigma), the absolute electronegativity (chi), proton affinity (PA) and nucleophilicity (omega) etc., were computed and discussed. Monte Carlo simulations were applied to search for the most stable configuration and adsorption energies for the interaction of the inhibitors with Fe (110) surface. The theoretical data obtained are in most cases in agreement with experimental results. (C) 2016 Elsevier B.V. All rights reserved.