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Evaluation of Sulfidation Resistance of Atomized Fe40Al Based Intermetallics

Published online by Cambridge University Press:  31 January 2012

M. A. Espinosa-Medina ,
G. Carbajal de la Torre ,
A. Martínez-Villafañe  and
J.G. González-Rodríguez
M. A. Espinosa-Medina*
Affiliation:
Facultad de Ingeniería Mecánica, UMSNH, C.P. 58000, Morelia, Mich., México.
G. Carbajal de la Torre
Affiliation:
Facultad de Ingeniería Mecánica, UMSNH, C.P. 58000, Morelia, Mich., México.
A. Martínez-Villafañe
Affiliation:
CIMAV, Complejo Industrial Chihuahua, Chihuahua. México.
J.G. González-Rodríguez
Affiliation:
UAEM-CIICAP, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos, México.
*
*Email: [email protected]
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Abstract

The isothermal oxidation-sulfidation of Fe-40Al based intermetallics alloys in N2/SO2 gas mixture at 625, 700 and 775°C were evaluated. Fe40Al, Fe40Al+0.1B, Fe40Al+0.1B+10Al2O3 alloys were produced by atomization and deposition. Isothermal gas exposition was reached during 48 hours. FeAl based alloys showed good sulfidation resistance, presenting both small weight gain and weight change fluctuations. At 625°C, the Fe40Al+0.1B alloy had the biggest weight gain; on the other hand the Fe40Al alloy exhibited the biggest sulfidation resistance. At 700 and 775°C, the Fe40Al+0.1B alloy presented the smallest weight gain, however Fe40Al alloy presented higher weight gain, that is to say, the smallest sulfidation resistance at those temperatures. The variation in the weight gain curves were discussed in terms of formation and detachment of sulfides, and by local attack on the alloy surface as the temperature increasing. The results are supplemented with characterization by SEM and analysis of X-rays dispersion.

Keywords

AlloyOxidationThermogravimetric analysis (TGA)CorrosionScanning electron microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1372: Symposium S3 – Structural and Chemical Characterization of Metal Alloys and Compounds—2011 , 2012 , imrc-1372-s3-p101
Copyright
Copyright © Materials Research Society 2012

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