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International Journal of Corrosion
Volume 2011 (2011), Article ID 896845, 7 pages
http://dx.doi.org/10.1155/2011/896845
Research Article

Corrosion Behavior of Mg-Al/TiC Composites in NaCl Solution

1Instituto de Investigaciones Metalurgicas, Universidad Michoacana de San Nicolás de Hidalgo, 58060 Morelia, MICH, Mexico
2CIICAp, Universidad Autonoma del Estado de Morelos, Avenue Universidad 1001, 62209 Cuernevaca, MOR, Mexico

Received 6 October 2010; Revised 14 January 2011; Accepted 17 January 2011

Academic Editor: Sebastian Feliu

Copyright © 2011 L. A. Falcon 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 TiC particles reinforced Mg-Al alloy in 3.5% NaCl solution has been evaluated using electrochemical techniques. Tested alloys included an Mg-9Al (Mg AZ91E) alloy with and without 56 wt. % TiC particles. Electrochemical techniques included potentiodynamic polarization curves, linear polarization resistance, electrochemical noise, and electrochemical impedance spectroscopy measurements. All techniques showed that the composite exhibited a lower corrosion rate than the base alloy. Evidence of galvanic effects that increased the composite corrosion rate was found between the matrix and the TiC particles. Additionally, the tendency to suffer from pitting corrosion was higher for the base alloy than that for the composite. Electrochemical impedance results showed the importance of adsorption/diffusion phenomena in both materials.