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Advances in Materials Science and Engineering
Volume 2012 (2012), Article ID 629802, 9 pages
http://dx.doi.org/10.1155/2012/629802
Research Article

Corrosion of Mechanically Alloyed Nanostructured FeAl Intermetallic Powders

1Facultad de Cencías Químicas e Ingeniería, P.E. I.M. Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Col. Chamilpa, 62210 Cuernavaca, MOR, Mexico
2Instituto de Investigaciones Metalurgicas, UMSNH, Edificio U., Ciudad Universitaria, 58000 Morelia, MICH, Mexico
3Centro de Investigacion en Ingeniería y Ciencias Aplicadas, UAEM, Avenida Universidad 1001, Col. Chamilpa, 62210 Cuernavaca, MOR, Mexico
4Facultad de Química, Instituto de Ingenieria, UNAM, Circuito Exterior S/N, Cd. Universitaria, 04510, Mexico

Received 13 September 2012; Accepted 29 November 2012

Academic Editor: Peter Majewski

Copyright © 2012 A. Torres-Islas 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 corrosion behavior of the Fe40Al60 nanostructured intermetallic composition was studied using electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques with an innovative electrochemical cell arrangement. The Fe40Al60 (% at) intermetallic composition was obtained by mechanical alloying using elemental powders of Fe (99.99%) and Al (99.99%). All electrochemical testing was carried out in Fe40Al60 particles that were in water with different pH values. Temperature and test time were also varied. The experimental data was analyzed as an indicator of the monitoring of the particle corrosion current density . Different oxide types that were formed at surface particle were found. These oxides promote two types of surface corrosion mechanisms: (i) diffusion and (ii) charge transfer mechanisms, which are a function of behavior of the solution, pH, temperature, and test time. The intermetallic was characterized before and after each test by transmission electron microscopy. Furthermore, the results show that at the surface particles uniform corrosion takes place. These results confirm that it is possible to sense the nanoparticle corrosion behavior by EIS and LPR conventional electrochemical techniques.