Effects of sulfur pressure on the sulfidation behavior of 310 stainless steel
- National Taiwan Ocean Univ. (China)
High-temperature sulfidation behavior of 310 stainless steel was studied over the temperature range of 700-900{degrees}C above a pure sulfur pool with the sulfur-vapor range of 10{sup {minus}4}-10{sup {minus}1} atm. The corrosion kinetics followed the parabolic rate law in all cases. The corrosion rates increased with increasing temperature and sulfur pressure. The scales formed on 310 stainless steel were complex and multilayered. The outer scale consisted of iron sulfide (with dissolved Cr), (Fe, Ni){sub 9}S{sub 8} and chromium sulfides (Cr{sub 2}S{sub 3} and Cr{sub 3}S{sub 4} with dissolved Fe), while the inner layer was a heterophasic mixture of Cr{sub 2}S{sub 3}, Cr{sub 3}S{sub 4}, NiCr{sub 2}S{sub 4}, and Fe{sub 1{minus}x}S. Platinum markers were found to be located at the interface between the inner and outer scales, suggesting that the outer scale grew by the outward transport of cations (Fe, Ni, and Cr), and the inner scale grew by the inward transport of sulfur. The formation of Cr{sub 2}S{sub 3}, Cr{sub 3}S{sub 4}, and NiCr{sub 2}S{sub 4} partly blocked the transport of iron through the inner scale, resulting in a reduction of the corrosion rates as compared with the results in the literature.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 381306
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 3-4 Vol. 46; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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