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Consejo Superior de Investigaciones Científicas, Revista de Metalurgia, 6(48), p. 405-413

DOI: 10.3989/revmetalm.1149

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Corrosion behavior of Fe<sub>3</sub>Al intermetallics with addition of lithium, cerium and nickel in 2.5 % SO<sub>2</sub>+N<sub>2</sub> at 900 °C

Journal article published in 2012 by A. Luna-Ramírez, J. Porcayo-Calderón ORCID, A. Martínez-Villafane, J. G. González-Rodríguez, J. G. Chacón-Nava
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The corrosion behavior of Fe3Al-type intermetallic alloys with addition of 1 at. % cerium, lithium and nickel at high temperature has been studied. The various alloys were exposed to an environment composed of 2.5 % SO2+N2 at 900 °C for 48 h. For all the intermetallic tested, the corrosion kinetics showed a parabolic behavior. The alloy, which showed less corrosion rate, was the Fe3AlNi alloy, being Fe3AlCeLi the alloy with the highest corrosion rate. For the various alloys, energy dispersive X-ray spectroscopy analysis, EDS, on the developed scale only detected aluminum, oxygen, and traces of iron and cerium, suggesting the formation of alumina as main component. The intermetallic alloys showed oxide cracking and spalling. The intermetallic chemical composition played an important role in defining the oxide scale morphology and the extent of damage.