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High Temperature Sulfidation Resistance of DO3 - Ordered FeAl Tested in H2S-rich Gases

Published online by Cambridge University Press:  26 February 2011

Pierre-Yvan Thery ,
Anna Fraczkiewicz ,
Cecile Genevois ,
Xavier Longaygue  and
Francois Ropital
Pierre-Yvan Thery
Affiliation:
[email protected] Nationale Superieure des Mines de St-EtienneCentre SMS UMR CNRS 5146158 Cours FaurielSt-Etienne 42100France, Metropolitan
Anna Fraczkiewicz
Affiliation:
[email protected], Ecole Nationale Superieure des Mines de St-Etienne, Centre SMS UMR CNRS 5146, 158 Cours Faur iel, St-Etienne, 42100, France, Metropolitan
Cecile Genevois
Affiliation:
[email protected], Ecole Nationale Superieure des Mines de St-Etienne, Centre SMS UMR CNRS 5146, 158 Cours Fauriel, St-Etienne, 42100, France, Metropolitan
Xavier Longaygue
Affiliation:
[email protected], Institut Francais du Petrole, 1-4 rue de Bois-Préau, Rueil-Malmaison, 92852, France
Francois Ropital
Affiliation:
[email protected], Institut Francais du Petrole, 1-4 rue de Bois-Préau, Rueil-Malmaison, 92852, France
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Abstract

The sulfidation behaviour at 973 K in a 30 vol.% H2S-H2-H2O-N2 gas mixture of Fe-25 % at. Al, DO3-ordered alloys, binary or alloyed with niobium, was investigated. Binary alloys presented a quite good sulfidation resistance in comparison with 321 stainless steel, even if a large amount of iron sulfides FeS grew over the alumina layer on corroded samples. The sulfidation resistance of DO3 alloys could be significantly improved by an oxidation treatment prior to corrosion test. The Nb in iron aluminides was supposed to preferably react with S and therefore, to enhance sulfidation resistance through preventing the nucleation and growth of harmful FeS. Unfortunately, the scales of Nb-allloyed FeAl contained only a small amount of Nb3S4 which did not prevent efficiently the formation of iron aluminides FeS. Adding Nb to Fe-25Al even resulted in a severe deterioration of the microstructure during sulfidation due to intense diffusion of S inward the sample.

Keywords

NbcorrosionFe
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-09
Copyright
Copyright © Materials Research Society 2007

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References

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