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Journal of Chemistry
Volume 2013, Article ID 720965, 8 pages
Research Article

Inhibition of Corrosion of Carbon Steel in Well Water by DL-Phenylalanine-Zn2+ System

1PG and Research Department of Chemistry, GTN Arts College, Dindigul 624005, India
2Department of Chemistry, RVS School of Engineering and Technology, Dindigul 624005, India
3Department of Chemistry, Anna University of Technology Madurai, Dindigul Campus, Dindigul, India

Received 26 December 2011; Revised 14 May 2012; Accepted 15 May 2012

Academic Editor: Hassan Arida

Copyright © 2013 A. Sahaya Raja 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 environmental friendly inhibitor system DL-phenylalanine-Zn2+ has been investigated by weight loss method. A synergistic effect exists between DL-phenylalanine and Zn2+ system. The formulation consisting of 150 ppm of DL-phenylalanine and 5 ppm of Zn2+ offers good inhibition efficiency of 90%. Polarization study reveals that this formulation functions as a anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. The surface morphology has been analysed by SEM and EDAX. A suitable mechanism of corrosion inhibition is proposed based on the results obtained from weight loss study and electrochemical studies.