Benzimidazole‐2‐tione and benzoxazole‐2‐tione derivatives as corrosion inhibitors for aluminium in hydrochloric acid

G. Bereket (Chemistry Department, Faculty of Arts and Science, Osmangazi University, Eskişehir, Turkey)
A. Pınarbaşı (Chemistry Department, Faculty of Arts and Science, Osmangazi University, Eskişehir, Turkey)
C. Öğretir (Chemistry Department, Faculty of Arts and Science, Osmangazi University, Eskişehir, Turkey)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 1 August 2004

Abstract

The effect of benzimidazole‐2‐tione and benzoxazole‐2‐tione derivatives on the corrosion of aluminium in 0.1 M HCl has been investigated by a potentiostatic polarisation technique. Inhibition efficiencies were found to follow the order: benzimidazole‐2‐tione > 5‐methyl benzimidazole‐2‐tione > 5‐chloro benzimidazole‐2‐tione, while that of benzoxazole‐2‐tione derivatives were found to follow the order: 5‐methyl benzoxazole‐2‐tione > benzoxazole‐2‐tione > 5‐chloro benzoxazole‐2‐tione > 5‐nitro benzoxazole‐2‐tione. The inhibitive action of these heterocyclic compounds was mainly due to adsorption on the metal surfaces, which show parallelism with the calculated total negative charge of each of the molecules. Thermodynamic parameters, such as values of free energies of adsorption ΔGads and values of equilibrium constants Kads, were determined. Activation energies Ea, activation enthalpies ΔH* and activation entropies ΔS* were determined from the corrosion currents measured at different temperatures.

Keywords

Citation

Bereket, G., Pınarbaşı, A. and Öğretir, C. (2004), "Benzimidazole‐2‐tione and benzoxazole‐2‐tione derivatives as corrosion inhibitors for aluminium in hydrochloric acid", Anti-Corrosion Methods and Materials, Vol. 51 No. 4, pp. 282-293. https://doi.org/10.1108/00035590410541364

Publisher

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Emerald Group Publishing Limited

Copyright © 2004, Emerald Group Publishing Limited

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