EXPERIMENTAL AND QUANTUM STUDIES ON ADSORPTION AND CORROSION INHIBITION EFFECT OF IMIDAZOLE DERIVATIVES ONN80STEEL IN HYDROCHLORIC ACID

M. Yadav (), Sumit Kumar, Dipti Sharma and P. N. Yadav
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M. Yadav: Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India
Sumit Kumar: Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India
Dipti Sharma: Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India
P. N. Yadav: Department of Physics, Post Graduate College Ghazipur, 133002, India

Surface Review and Letters (SRL), 2013, vol. 20, issue 06, 1-18

Abstract: The inhibition effect of synthesizedN′-(phenylmethylidene)-2-(2-methyl-1H-benzimidazol-1-yl)acetohydrazides,N′-(4-methylphenylmethylidene)-2-(2-methyl-1H-benzimidazol-1-yl)acetohydrazides, andN′-(4-methoxyphenylmethylidene)-2-(2-methyl-1H-benzimidazol-1-yl)acetohydrazides on the corrosion behaviour ofN80steel in 15% hydrochloric acid solution was investigated using weight loss, potentiostatic polarization and electrochemical impedance spectroscopy methods. The inhibition efficiency increased as the concentration of the inhibitors was increased. The effect of temperature on corrosion inhibition was investigated by weight loss method and thermodynamic parameters were calculated. Potentiodynamic polarization measurements show that all the three studied inhibitors act as mixed inhibitor. The adsorption of inhibitors onN80steel surface obeys Langmuir adsorption isotherm. The structure of inhibitors was optimized using semiemperical AM1 method. Theoretical parameters such as the highest occupied molecular orbital(EHOMO), lowest unoccupied molecular orbital(ELUMO)energy levels, energy gap(ΔE = ELUMO- EHOMO), dipole moment (μ), global hardness (γ), softness (σ), binding energy, molecular surface area and the fraction of electrons transferred(ΔN)were calculated and the adsorption mechanism was discussed. Scanning electron microscopy was used to characterize the surface marphology of theN80steel.

Keywords: N80steel; hydrochloric acid; inhibition; EIS; SEM; molecular modeling (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500571

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