Table of Contents
Advances in Chemistry
Volume 2014, Article ID 808456, 10 pages
http://dx.doi.org/10.1155/2014/808456
Research Article

Baphia nitida Leaves Extract as a Green Corrosion Inhibitor for the Corrosion of Mild Steel in Acidic Media

1Department of Chemistry, Faculty of Science, Imo State University, PMB 2000, Owerri, Nigeria
2Department of Chemistry, Federal University of Technology Owerri, PMB 1526, Owerri, Nigeria
3Department of Pure and Industrial Chemistry, University of Port Harcourt, PMB 5323, Port Harcourt, Nigeria

Received 21 April 2014; Accepted 10 July 2014; Published 4 August 2014

Academic Editor: Ana Mornar

Copyright © 2014 V. O. Njoku 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 Baphia nitida (BN) leaves extract on the corrosion of mild steel in 1 M H2SO4 and 2 M HCl was studied at different temperatures using gasometric and weight loss techniques. The results showed that the leaves extract is a good inhibitor for mild steel corrosion in both acid media and better performances were obtained in 2 M HCl solutions. Inhibition efficiency was found to increase with increasing inhibitor concentration and decreasing temperature. The addition of halides to the extract enhanced the inhibition efficiency due to synergistic effect which improved adsorption of cationic species present in the extract and was in the order KCl < KBr < KI suggesting possible role of radii of the halide ions. Thermodynamic parameters determined showed that the adsorption of BN on the metal surface is an exothermic and spontaneous process and that the adsorption was via a physisorption mechanism.