Previous work has shown the beneficial effect of yttrium implantation on the oxidation behaviour of chromium oxide forming alloys. Because of the limited applicability of Fe-Cr-Ni alloys in sulphur containing gases the effect of yttrium implantation on the sulphidation of Incoloy 800H was studied. In short time tests a significant improvement was observed upon implantation of about 1016 yttrium ions/cm2 if an oxidizing treatment was applied before exposition to the sulphiding environment. The explanation of this effect is probably similar to that proposed in the literature for the improved oxidation resistance.
Kort, J. H., Fransen, T., & Gellings, P. J. (1986). The effect of yttrium ion implantation on the sulphidation of incoloy 800H. Applied surface science, 25(1-2), 237-240. https://doi.org/10.1016/0169-4332(86)90042-5