Table of Contents
ISRN Corrosion
Volume 2014 (2014), Article ID 945645, 8 pages
http://dx.doi.org/10.1155/2014/945645
Research Article

Corrosion Inhibition of Carbon Steel in 0.5 M H2SO4 by Phtalocyanine Blue

1Universidad Autonoma del Estado de Morelos, CIICAP, Avenida Universidad 1001, 62209 Cuernavaca, MOR, Mexico
2Facultad de Ciencias Biologicas, Universidad Autonoma del Estado de Morelos, Avenida Universidad 1001, 62209 Cuernavaca, MOR, Mexico

Received 2 September 2013; Accepted 23 December 2013; Published 3 February 2014

Academic Editors: A. Hermann, I. Obot, and R. Salghi

Copyright © 2014 J. C. Valle-Quitana 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

Phthalocyanine blue dye has been investigated as a carbon steel corrosion inhibitor in 0.5 M sulfuric acid by using polarization curves, electrochemical impedance spectroscopy, and gravimetric tests. Dye concentrations included 0, 100, 200, 400, 600, 800, and 1000 ppm, whereas testing temperatures were 25, 40, and 60°C. Results indicated that phtalocyanine blue is a good corrosion inhibitor with its efficiency increasing with the concentration up to 40°C, but it increases at 60°C. Inhibitor improves the passive film properties and it forms an adherent, compact, protective film, acting, therefore, as an anodic-type inhibitor. At 25 and 40°C the corrosion process was under charge transfer, whereas at 60°C the adsorption/desorption of some species from the metal surface controlled the corrosion process.