Effects of Mo and Al additions on the sulfidation behavior of 310 stainless steel

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)89-122
Journal / PublicationOxidation of Metals
Volume50
Issue number1-2
Publication statusPublished - 1998
Externally publishedYes

Abstract

The high-temperature sulfidation behavior of 310 stainless steel (310SS) with Mo and Al additions (up to 10 at.%) was studied over the temperature range 700-900°C in pure-sulfur vapor over the range of 10-3 to 10-1 atm. The corrosion kinetics followed the parabolic rate law in all cases and the sulfidation rates increased with increasing temperature and sulfur pressure. The sulfidation rates decreased with increasing Mo and Al contents and it was found that the addition of 10 at.% Mo resulted in the most pronounced reduction among the alloys studied. The scales formed on 310SS with Mo additions were complex, consisting of an outer layer of iron sulfide (with dissolved Cr), (Fe, Ni)9S8, and Cr2S3/Cr3S4 (with dissolved Fe), and an inner heterophasic layer of Fe1-xS, Cri2S3/Cr3S4, NiCr2S4 Fe1.25Mo6S7.7, FeMo2S4, and MoS2. The scales formed on 310SS with Mo and Al additions had a similar mixture as above, except that Al0.55Mo2S4 was also observed in the inner layer. The formation of MoS2 and Al0.55Mo2S4, partly blocked the transport of cations through the inner scale, resulting in the reduction of the sulfidation rates compared to 310SS.

Research Area(s)

  • 310SS, Mo, Al, Al0.55Mo2S4, Fe1.25Mo6S7.7, FeMo2S4, MoS2, Sulfldation

Bibliographic Note

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Citation Format(s)

Effects of Mo and Al additions on the sulfidation behavior of 310 stainless steel. / Kai, W.; Leu, C. J.; Wu, Y. J.

In: Oxidation of Metals, Vol. 50, No. 1-2, 1998, p. 89-122.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review