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Journal of Chemistry
Volume 2013, Article ID 541691, 7 pages
http://dx.doi.org/10.1155/2013/541691
Research Article

Inhibition Effect of Benzohydrazide Derivatives on Corrosion Behaviour of Mild Steel in 1 M HCl

Advanced Materials Research Laboratory, Department of Industrial Chemistry, Alagappa University, Karaikudi 630 003, India

Received 23 January 2012; Revised 4 June 2012; Accepted 6 June 2012

Academic Editor: Ali Nokhodchi

Copyright © 2013 P. Mohan et al. 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 inhibiting effect of N-benzylidenebenzohydrazide (BBH) and N -(3-phenylallylidene) benzohydrazide (PABH) on the corrosion inhibition of mild steel in 1 M HCl solutions were determined by weight loss and electrochemical methods. These inhibitors were adsorbed on the surface according to Langmuir adsorption isotherm. Both BBH and PABH have offered inhibition efficiencies upto 97%. The free energy of activation for the corrosion process has suggested the participation of these molecules in the corrosion process. The adsorbed inhibitor complex has offered barrier protection and prevented the corrosion. The dissolution of iron was also retarded thereby they inhibited corrosion. The surface morphology analysis confirmed the presence of a film on the surface.