Sulfidation properties of Fe-Al alloys at 1173 K in H2S-H2 atmospheres

Abstract

The sulfidation kinetics and morphological development of reaction products are reported for Fe-9 and 18 at.% Al alloys exposed at 1173 K to H2S-H2 atmospheres at sulfur pressures in the range 10−1−103 Pa. The Fe-9 Al alloy sulfidized parabolically at\({\text{P}}_{{\text{S}}_{\text{2}} } = 10^{ - 1} \) Pa giving rise to a duplex scale composed of an outer Al-doped FeS layer and an inner FeS + FeAl2S4 lamellar layer and to an internal sulfidation zone containing Al2S3 precipitates. The Fe-18 Al alloy which was sulfidized at\(10^2 {\text{Pa}} \geqslant {\text{P}}_{S_2 } \geqslant 10\).