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ISRN Materials Science
Volume 2014 (2014), Article ID 154285, 5 pages
http://dx.doi.org/10.1155/2014/154285
Research Article

Inhibition of Corrosion of Aluminium in Potassium Hydroxide Solution by Pyridine Derivatives

1Department of Chemistry, Institute of Science, Nagpur 440 001, India
2Department of Chemistry, Manoharbhai Patel Institute of Engineering and Technology, Gondia 441 614, India

Received 19 September 2013; Accepted 3 November 2013; Published 19 January 2014

Academic Editors: V. Baranauskas, P. de Lima-Neto, and B. Li

Copyright © 2014 D. B. Patil and A. R. Sharma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of 3-methylpyridine and 3-nitropyridine on the corrosion rate of aluminium in 1 mol L−1 potassium hydroxide solution was investigated using weight loss method. It was observed that both investigated derivatives behave as inhibitors. It was found that the inhibition efficiency increases with increasing inhibitor concentration. The inhibition mechanism is discussed on the basis of adsorption of inhibitor molecules on the metal surface. The inhibitors were adsorbed on the surface according to the Frumkin adsorption isotherm. The effect of temperature on the corrosion inhibition of Al was studied and thermodynamic functions for the dissolution and adsorption processes in the absence and in the presence of the inhibitors were computed and discussed.