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      • KCI등재

        Pyranpyrazole derivatives as novel corrosion inhibitors for mild steel useful for industrial pickling process: Experimental and Quantum Chemical study

        Parul Dohare,K.R. Ansari,M.A. Quraishi,I.B. Obot 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-

        In the present work three new corrosion inhibitors namely ethyl 6-amino-3-methyl-4-(p-tolyl)-2,4-dihydropyrano[2,3,C]pyrazole-5-carboxylate (EPP-1), ethyl 6-amino-3-methyl-4(phenyl)-2,4-dihydro-pyrano[2,3,C]pyrazole-5-carboxylate (EPP-2), ethyl 6-amino-3-methyl-4-(3-nitrophenyl)-2,4-dihydro-pyrano[2,3,C]pyrazole-5-carboxylate (EPP-3) were prepared, characterized and their corrosion inhibitionproperties on mild steel were investigated using gravimetric, potentiodynamic polarization andelectrochemical impedance spectroscopy (EIS). The surface morphology of the mild steel was examinedusing scanning electron microscopy (SEM) and atomic force microscopy (AFM). EPP-1 exhibited highestefficiency of 98.8% at 100 mg/L. AFM and SEM studies confirmed the formation of adsorbedfilm on themetal surface. The inhibitors followed the Langmuir adsorption isotherm. Density functional theory(DFT) was used to understand donor–acceptor relationship between inhibitors and metal. Theorientation and binding energy of inhibitor molecules were investigated using molecular dynamicsimulation (MD). A good relationship was obtained between theoretical and experimental results.

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