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Corrosion inhibition performance of Coriander Seeds extract molecules for pure Aluminum in Hydrochloric acid Medium: A combined Experimental and Quantum chemical approach

Author Affiliations

  • 1Department of Chemistry, School of Sciences, Gujarat University, Navrangpura, Ahmedazbad-380009, Gujarat, INDIA
  • 2School of Chemical Sciences, Central University of Gujarat, Sector – 30, Gandhinagar- 382030, Gujarat, INDIA

Res. J. Recent Sci., Volume 5, Issue (1), Pages 27-34, January,2 (2016)

Abstract

The study of inhibitive properties of coriander seeds extract (CSE) molecules over Aluminum surface in 1M hydrochloric acid (HCl) medium was performed by standard weight loss(gravimetric) and electrochemical impedance methods. Result from gravimetric measurements showed that behavior of inhibition efficiency is directly proportional to concentration of inhibitor. Impedance measurement reveals that charge transfer resistance and constant phase element values increases and decreases respectively with increase in concentration of inhibitor. The study indicates that the molecules present in the extract forms a protective layer at metal/solution interface. In addition quantum chemical study was also performed using density functional theory (DFT) to elucidate the inhibitory activity of individual molecule present in the extract. The result from quantum study showed that 10, 12-Hexadecadien-1-ol had the maximum power of adsorption at Aluminum surface to prevent it from corrosion.

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