The oxidation-sulfidation behavior of iron alloys containing 16–40 AT% aluminum

Autor:	P.F. Tortorelli, J.H. DeVan
Rok vydání:	1993
Předmět:	Materials science Mixed gas General Chemical Engineering Metallurgy Iron alloys Sulfidation chemistry.chemical_element General Chemistry Corrosion Chromium chemistry Aluminium General Materials Science Aluminide Oxidation resistance
Zdroj:	Corrosion Science. 35:1065-1071
ISSN:	0010-938X
DOI:	10.1016/0010-938x(93)90325-b
Popis:	Iron aluminide alloys containing 16–40 at% aluminum and 0–5 at% chromium were tested in H2S-H2-H2O gas mixtures at 800°C and in air at 800–1000°C. Results were compared with those for developmental FeCrAl alloys. Alloys containing 18% or more aluminum were highly resistant to H2S-H2-H2O gas mixtures, and the corrosion behavior did not change significantly with aluminum concentrations above 18%. A 20 at% Al level was found to be critical for sustained oxidation resistance of binary FeAl alloys in air at 900°C and above. However, the addition of 5 at% Cr at the 16 at% Al level reduced the oxidation rate in air to that of alloys containing ≥20% Al. Corrosion rates of iron aluminides were comparable to FeCrAl alloys in air but were significantly lower than Cr-containing alloys in H2S-H2-H2O. The respective corrosion processes operative for iron aluminides in mixed gas and air are discussed in terms of the observed alloying effects.
Databáze:	OpenAIRE
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