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International Journal of Chemical Engineering
Volume 2014, Article ID 607209, 9 pages
Research Article

Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn2+ System

1PG and Research Department of Chemistry, Corrosion Research Centre, GTN Arts College, Dindigul, Tamil Nadu 624 005, India
2Department of Chemistry, RVS School of Engineering and Technology, Dindigul, Tamil Nadu, India

Received 17 November 2013; Accepted 7 January 2014; Published 15 April 2014

Academic Editor: Evangelos Tsotsas

Copyright © 2014 S. Gowri 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.


The inhibition efficiency of L-Arginine-Zn2+ system in controlling corrosion of carbon steel in sea water has been evaluated by the weight-loss method. The formulation consisting of 250 ppm of L-Arginine and 25 ppm of Zn2+ has 91% IE. A synergistic effect exists between L-Arginine and Zn2+. Polarization study reveals that the L-Arginine-Zn2+ system functions as an anodic inhibitor and the formulation controls the anodic reaction predominantly. AC impedance spectra reveal that protective film is formed on the metal surface. Cyclic voltammetry study reveals that the protective film is more compact and stable even in a 3.5% NaCl environment. The nature of the protective film on a metal surface has been analyzed by FTIR, SEM, and AFM analysis.