J. Klower et al., High temperature corrosion behaviour of nickel aluminides: effects of chromium and zirconium, INTERMETALL, 7(10), 1999, pp. 1183-1194
The high temperature corrosion behaviour of nickel aluminide Ni3Al containi
ng up to 8 mass % chromium and up to 0.9 mass % zirconium has been investig
ated in air and in carburizing, chlorinating and sulphidizing process gases
. It was found that undoped Ni3Al shows excellent resistance in air, in car
burizing gases and in chlorinating/oxidizing atmospheres, while its corrosi
on resistance in oxygen-deficient chlorinating gas atmospheres and in sulph
idising atmospheres is poor. Additions of zirconium have a strong impact on
the corrosion behaviour, they prevent evaporation of volatile aluminium ch
lorides in oxygen-deficient chlorinating environments but they increase the
oxidation rate in air and in chlorinating environments. Unlike zirconium,
chromium has only a small effect on the corrosion behaviour of Ni3Al. (C) 1
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