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High temperature Corrosion behaviour of iron aluminides and iron‐aluminium‐chromium alloys
Author(s) -
Klöwer J.
Publication year - 1996
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19960471205
Subject(s) - chromium , aluminium , metallurgy , corrosion , materials science , high temperature corrosion , mischmetal , alloy , hydrogen storage
The high temperature corrosion of different iron aluminides and iron‐aluminium‐chromium alloys containing between 6 and 17 wt% aluminium, 2 and 10 wt% chromium and additions of mischmetal has been investigated in air as well as in carburising, chlorinating and sulphidising environments. It was found that all alloys showed excellent corrosion resistance to both oxidation in air and carburisation in CH 4 /H 2 up to at least 1100°C and to sulphidation in SO 2 /air up to at least 850°C. In these environments the corrosion behaviour is not influenced by the concentrations of aluminium and chromium. In oxygen deficient H 2 S‐atmospheres, however, the corrosion behaviour depends sensitively on the aluminium and chromium concentration. At least 12 wt% aluminium in chromium‐free alloys or 10 wt% aluminium in alloys containing 10 wt% chromium are required to provide sulphidation resistance at 550°C. The chlorination resistance of iron‐aluminium‐chromium alloys is low due to their formation of volatile aluminium chlorides.