Electro analytical, surface morphological and theoretical studies on the corrosion inhibition behavior of different 1,2,4-triazole precursors on mild steel in 1Â M hydrochloric acid

► Corrosion protection properties of three 1,2,4-triazole derivatives have been investigated. ► Mechanism involves combination of physisorption and chemisorptions. ► The adsorption phenomenon obeys Langmuir isotherm. ► These molecules show excellent inhibition efficiencies. ► Employing Gaussian DFT method for computational study of these inhibitors.