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The impurity-yttrium interactions have been studied for iron oxidation at 700 C. Yttrium implanted specimens exhibited a better oxidation behaviour compared with blank specimens. On pure iron or the Fe-0.054wt%C alloy the beneficial effect is attributed to the Fe(2)YO(4) formation. With manganese containing alloys (Fe-0.2wt%Mn), the protective effect of yttrium is attributed to the YMnO(3) formation. The best oxidation behaviour is obtained with implanted Fe-0.18wt%Mn-0.041wt%C alloys due to the formation of a YMnO(3) oxide subscale at the scale/alloy interface. Yttrium implantation also hinders carbon segregation at the oxide/alloy interface. This effect insures a better scale adherence. With the most impure alloy, yttrium implantation also changes the growth process from external cation diffusion to predominant inward oxygen diffusion.

Additional information

Authors: BUSCAIL H, Institut Universitaire de Technologie, Département de Chimie - Sciences et Techniques, Le Puy-en-Velay (FR);COURTY C, Laboratoire de Recherches sur la Réactivité des Solides, Dijon (FR);LARPIN J P, Laboratoire de Recherches sur la Réactivité des Solides, Dijon (FR);STROOSNIJDER M F, JRC Ispra (IT);JACOB Y P, JRC Ispra (IT)
Bibliographic Reference: Article: Oxidation of Metals (1997)
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