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

Benzimidazole‐2‐tione and benzoxazole‐2‐tione derivatives as corrosion inhibitors for aluminium... 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 Δ G ads and values of equilibrium constants K ads , were determined. Activation energies E a , activation enthalpies Δ H * and activation entropies Δ S * were determined from the corrosion currents measured at different temperatures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

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

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Publisher
Emerald Publishing
Copyright
Copyright © 2004 Emerald Group Publishing Limited. All rights reserved.
ISSN
0003-5599
DOI
10.1108/00035590410541364
Publisher site
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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 Δ G ads and values of equilibrium constants K ads , were determined. Activation energies E a , activation enthalpies Δ H * and activation entropies Δ S * were determined from the corrosion currents measured at different temperatures.

Journal

Anti-Corrosion Methods and Materials – Emerald Publishing

Published: Aug 1, 2004

Keywords: Non ferrous metals; Corrosion inhibitors; Acids

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