Journal of Chemical Sciences

, Volume 127, Issue 5, pp 921–929 | Cite as

Effect of optimized structure and electronic properties of some benzimidazole derivatives on corrosion inhibition of mild steel in hydrochloric acid medium: Electrochemical and theoretical studies

  • ALOKDUT DUTTA
  • SUJIT SANKAR PANJA
  • M M NANDI
  • DIPANKAR SUKUL
Article
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Revised:
Accepted:

Abstract

The corrosion inhibitive action of a few benzimidazole derivatives namely 2-(benzamido) ethylbenzimidazole (BAEBI), 2-(β-benzenesulphonamido) ethylbenzimidazole (BSAEBI), 2-(benzamido) methylbenzimidazole (BAMBI) and 2-(β-benzenesulphonamido) methylbenzimidazole (BSAMBI), towards mild steel in hydrochloric acid has been studied using potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) methods. The results show that these compounds get adsorbed on the mild steel surface following Temkin adsorption isotherm, and act as mixed-type inhibitors. The inhibition efficiencies are found to follow the order, BAEBI > BSAEBI > BAMBI > BSAMBI. This observation is explained in terms of chain length, relative effects of amido and sulphonamido groups, possible structural factors, spatial orientations, energy gap between the frontier molecular orbitals, different intrinsic molecular parameters, like, global hardness and softness, and number of electrons transferred.

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Graphical Abstract

Corrosion inhibition property of four different benzamido and benzenesulphonamido derivatives of methylbenzimidazole and ethylbenzimidazole for mild steel in HCl depends on various molecular parameters, including chain length, substituent group, spatial orientation, energy gap between the frontier molecular orbitals, global hardness, softness, and number of electron transferred.

Keywords

Adsorption corrosion inhibition electrochemical techniques quantum mechanical calculations. 
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Notes

Acknowledgements

DS thanks Department of Science and Technology, Govt. of India for supporting a research project under Fast Track Scheme for Young Scientists (no. SR/FT/CS-110/2010).

Supplementary material

12039_2015_850_MOESM1_ESM.doc (367 kb)
(DOC 367 KB)

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Copyright information

© Indian Academy of Sciences 2015

Authors and Affiliations

  • ALOKDUT DUTTA
    • 1
  • SUJIT SANKAR PANJA
    • 1
  • M M NANDI
    • 1
  • DIPANKAR SUKUL
    • 1
  1. 1.Department of ChemistryNational Institute of Technology DurgapurDurgapurIndia

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