Table of Contents
ISRN Corrosion
Volume 2013, Article ID 261847, 9 pages
http://dx.doi.org/10.1155/2013/261847
Research Article

The Effect of Achyranthes aspera Extracts on Mild Steel Corrosion in Industrial Water Medium

Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570006, India

Received 24 March 2013; Accepted 9 May 2013

Academic Editors: O. Benali, C. V. D'Alkaine, A. Y. El-Etre, A. Hermann, R. Salghi, and E. Stupnisek-Lisac

Copyright © 2013 Chikkur B. Pradeep Kumar and Kikkeri N. Mohana. 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

Achyranthes aspera (AA) extracts were studied as corrosion inhibitor for mild steel (MS) in industrial water medium using mass loss and electrochemical techniques. The results of the study revealed that AA extracts inhibit MS corrosion through adsorption process following Langmuir adsorption isotherm model. The protection efficiency increased with increase in inhibitor concentration and decreased with temperature. The electrochemical impedance spectroscopy (EIS) measurements showed that the charge transfer resistance increases with increase in the concentration of AA extracts. The polarization curves obtained indicate that AA extracts act as mixed type of inhibitor. Scanning electron microscopy (SEM) was used to analyze the surface adsorbed film.