Abstract
Three multidentate Schiff base ligands (A = 3-(2-aminobenzylimino)-1-phenylbutan-1-one], Hbzacabza; B = 3-[({o-[(E)-(o-Hydroxyphenyl)methylideneamino]phenyl}methyl)imino]-1-phenyl-1-buten-1-ol, H2bzacabzasal; and C = 3-[({o-[(E)-(2-Hydroxy-1-naphthyl)methylideneamino]phenyl}methyl)imino]-1-phenyl-1-buten-1-ol, H2bzacabzanapht) were synthesized and their inhibiting effect on the corrosion of mild steel in 1 M hydrochloric acid was examined using potentiodynamic polarization and electrochemical impedance spectroscopy. These compounds are effective corrosion inhibitors with inhibition efficiency A < B < C. The adsorption of inhibitors obeys Langmuir adsorption isotherm and the thermodynamic parameters K ads, ΔGºads, E a are extracted. The order of K ads and E a values conforms to the observed inhibition efficiency of these compounds. The values of ΔGºads are close to −40.00 kJ/mol (in the range of −33.01 to −35.04 kJ/mol) and indicate that the corrosion inhibition effect involves both chemisorption and physisorption followed by the blocking of the active electrochemical sites on steel surface. The effect of A, B and C on mild steel was also studied by quantum chemical calculations.
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Partial support of this work by the Research Council of the Isfahan University of Technology was gratefully acknowledged.
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Sadeghi Erami, R., Amirnasr, M., Raeissi, K. et al. Multidentate Schiff bases as new and effective corrosion inhibitors for mild steel in hydrochloric acid solution: an electrochemical and quantum chemical assessment. J IRAN CHEM SOC 12, 2185–2197 (2015). https://doi.org/10.1007/s13738-015-0696-7
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DOI: https://doi.org/10.1007/s13738-015-0696-7