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Advances in Materials Science and Engineering
Volume 2018 (2018), Article ID 1616340, 19 pages
https://doi.org/10.1155/2018/1616340
Research Article

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni3Al

1Facultad de Química, Universidad Nacional Autónoma de Mexico, Edificio B, Cd. Universitaria, 04510 Ciudad de Mexico, Mexico
2CIICAp, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, 62209 Cuernavaca, MOR, Mexico
3CIATEQ A.C., Eje 126 No. 225, Zona Industrial, 78395 San Luis Potosí, SLP, Mexico
4Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de Mexico, Cd. Universitaria, 04510 Ciudad de Mexico, Mexico
5Instituto Nacional de Electricidad y Energías Limpias, Avenida Reforma 113, Colonia Palmira, 62490 Cuernavaca, MOR, Mexico
6Instituto de Ciencias Físicas, Universidad Nacional Autónoma de Mexico, Avenida Universidad s/n, 62210 Cuernavaca, MOR, Mexico
7Corrosion y Protección (CyP), Buffon 46, 11590 Mexico City, Mexico

Correspondence should be addressed to J. Porcayo-Calderon

Received 6 July 2017; Revised 12 October 2017; Accepted 1 November 2017; Published 17 January 2018

Academic Editor: Amit Bandyopadhyay

Copyright © 2018 J. J. Ramos-Hernandez 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

This paper discusses the effect of the addition of noble metals on the microstructure, mechanism, and oxidation kinetics of the Ni3Al intermetallic alloy. Ni3Al was doped with 1% (atomic percent) of Au, Ag, Pd, and Pt. Oxidation behavior of the alloys was evaluated at 900, 1000, and 1100°C in O2 for 24 hours. XRD analysis showed that the addition of noble metals favored the oxide growth on preferential crystallographic planes. In addition, the preferential substitution of the noble metals in the Ni3Al structure modifies the surface composition by increasing the Al/Ni ratio. It was observed that most of the alloys showed a subparabolic behavior, and only the intermetallic base and the alloy doped with Ag show a parabolic behavior at 900°C. The developed oxides were analyzed both superficially and in cross section by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA). It was evident that only the intermetallic base showed the formation of a duplex oxide scale (Al2O3/NiO). The alloys doped with noble metals showed the oxide growth practically of pure Al2O3. This was due to a decrease in the diffusion of the Ni cations because of the presence of the noble metals in the crystalline structure.