Journal of the Iranian Chemical Society

, Volume 12, Issue 12, pp 2185–2197 | Cite as

Multidentate Schiff bases as new and effective corrosion inhibitors for mild steel in hydrochloric acid solution: an electrochemical and quantum chemical assessment

  • Roghayeh Sadeghi Erami
  • Mehdi Amirnasr
  • Keyvan Raeissi
  • Mohamad Mohsen Momeni
  • Soraia Meghdadi
Original Paper

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 Kads, ΔGºads, Ea are extracted. The order of Kads and Ea 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.

Graphical Abstract

Keywords

Multidentate Schiff base ligands Corrosion inhibitors Mild steel Potentiodynamic polarization EIS 

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Copyright information

© Iranian Chemical Society 2015

Authors and Affiliations

  • Roghayeh Sadeghi Erami
    • 1
  • Mehdi Amirnasr
    • 1
  • Keyvan Raeissi
    • 2
  • Mohamad Mohsen Momeni
    • 1
  • Soraia Meghdadi
    • 1
  1. 1.Department of ChemistryIsfahan University of TechnologyIsfahanIran
  2. 2.Department of Materials EngineeringIsfahan University of TechnologyIsfahanIran

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