High-Temperature Corrosion of Incoloy Alloy 800 in N₂/H₂S Gas

Abstract:

The nickel-iron-chromium-based alloy, Incoloy alloy 800, was corroded at 600, 700 and 800 °C for 10-70 h under 1 atm of total pressure in three different atmospheres, viz., 1 atm of N₂, N₂/H₂O, and N₂/H₂O/H₂S-mixed gases. The corrosion rates always increased with addition of H₂O and, much more seriously, with the addition of H₂S gas. In N₂ and N₂/H₂O gases, oxidation prevailed. In N₂/H₂O/H₂S gases, sulfidation dominated. The corrosion resistance increased in the T22 steel displayed better resistance to oxidation and sulfidation than Fe-2Mn-0.5Si steel, owing to the presence of Cr. Strong enrichment of Cr and the presence of Ni and Fe were noticeable in the inner scale. Chromium sulfidized to FeCr₂S₄ in N₂/H₂O/H₂S gases, which was responsible for the enhanced sulfidation resistance of T22 compared with Fe-2.0Mn-0.5Si steel.

• Periodical: Applied Mechanics and Materials (Volume 864)
• Pages: 3-7
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.864.3
• Online since: April 2017
• Authors: Min Jung Kim, Dong Bok Lee*
• Keywords: Corrosion, H₂S, IGCC, Inconel Alloy 800, Sulfidation

References

[1] S. Mrowec, K. Przybylski, Transport properties of sulfide scales and sulfidation of metals and alloys, Oxid. Met. 23 (1985) 107-139.

DOI: 10.1007/bf00659899

[2] M. Danielewski, S. Mrowec, A. Stołosa, Sulfidation of iron at high temperatures and diffusion kinetics in ferrous sulfide, Oxid. Met. 17 (1982) 77-97.

DOI: 10.1007/bf00606194

[3] D. J. Young, High Temperature Oxidation and Corrosion of Metals, 2008, Elsevier, England.

[4] J. Shen, L. Zhou, T. Li, High-temperature oxidation of Fe-Cr alloys in wet oxygen, Oxid. Met. 48, (1997) 347-356.

DOI: 10.1007/bf01670507

[5] N. Birks, G. H. Meier, Introduction to High Temperature Oxidation of Metals, p.72, Edward Arnold, London (1983).

[6] D. A. Jones, Principles and Prevention of Corrosion, p.431, Prentice-Hall, USA (1996).