Table of Contents
ISRN Metallurgy
Volume 2012, Article ID 940107, 7 pages
http://dx.doi.org/10.5402/2012/940107
Research Article

Electrochemical Study of the Corrosion Behavior of Zinc Surface Treated with a New Organic Chelating Inhibitor

1Department of Chemistry, M.G.C. Arts, Commerce and G.H.D. Science College, Karnataka Siddapur 581 355, India
2Department of P.G. Studies and Research in Chemistry, Kuvempu University, Karnataka Shankaraghatta 577451, India
3Department of Chemistry, Srinivas School of Engineering, Mukka, Karnataka Mangalore 575 021, India

Received 22 June 2012; Accepted 2 August 2012

Academic Editors: M. Carboneras and T. Yue

Copyright © 2012 R. A. Prabhu 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 effect of a new organic compound (N-[(1E)-(4 methoxy phenyl)methylene]hydrazinecarbothioamide), called ATSC, with chelating groups, on the corrosion behavior of zinc was investigated. Electrochemical study of the zinc specimens was carried out in aqueous electrolyte containing 0.2 M Na2SO4 and 0.2 M NaCl maintained at pH 5 using galvanostatic polarization curves. The surface treatment of zinc was achieved by immersion in solutions of different concentrations of ATSC and for different immersion time and bath temperatures. The zinc metal treated with ATSC at 5% has showed good corrosion resistance and maximum protection efficiency of about 84% at 300 K. Moreover, the treatment induced a basic modification of the cathodic nature of zinc and controls the corrosion by decreasing the electron transfer rate. The corrosion protection could be explained by the formation of a protective organometallic layer on the zinc surface due to the chelation reaction between zinc and inhibitor molecules. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) were applied to study the protective layer.