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Adsorption and Quantum Chemical Studies on Piperidin-4-One Derivatives for the Corrosion of Mild Steel in 1 M HCl Medium

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Author Affiliations

  • 1Department of Chemitry, P.S.G.R.krishnammal College for Women, Coimbatore-641 004,INDIA

Res.J.chem.sci., Volume 4, Issue (12), Pages 75-85, December,18 (2014)

Abstract

The inhibition performance of synthesized 3-ethyl-2,6-biquinonyl-piperidin-4-one (CQEP) and 3-butyl-2,6-biquinonyl-piperidin-4-one (CQBP) were investigated as corrosion inhibitors for mild steel in a 1 M HCl solution using the weight loss, electrochemical polarization and electrochemical impedance spectroscopy (EIS) techniques. It was found that the inhibition efficiency of these inhibitors increased with increasing concentration. The effect of temperature (303, 313, 323 and 333 K) on the corrosion rate was investigated and some thermodynamic parameters (Ea,δHo and δSo ) were calculated. Polarization studies showed that both inhibitors studied were of a mixed type in nature. The adsorption of inhibitors on the mild steel surface obeys the Langmuir adsorption isotherm. Scanning electron microscopy (SEM) and atomic adsorption spectroscopy (AAS) were performed for the surface study of the uninhibited and inhibited mild steel samples. Density functional theory (DFT) was employed for theoretical calculations. The theoretical results were found to be consistent with the experimental data reported.

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