Corrosion Resistance of 9 - 15% Cr ODS Steels and its Comparison with Austenitic Stainless Steel

Abstract:

An oxide dispersion strengthened steels are one of the most promising high temperatures, and high performance advanced structural material being developed for future fast reactors and high-temperature Generation IV reactors. In the present work, the corrosion resistance and its correlation with the passive film compositions of 11% Cr F/M and 9-15% Cr (with Zr or Hf) ODS steels is examined and compared with AISI type 304L stainless steel in boiling 60 - 62% (~13 M) HNO₃. The corrosion rate measured in 62% HNO₃ for 240 h of 11% Cr F/M, 9% Cr and 15% Cr (Zr) ODS steels show high corrosion rate. On the other hand, low corrosion rate was observed in 304L stainless steel (0. 21 to 23 mm y^-1). However, severe intergranular corrosion attack was revealed in type 304L SS after 240 h exposure, but none in ODS steels. Such an intergranular corrosion attack seen in type 304L stainless steel is undesirable. On the contrary, low corrosion rate (0.04 0.15 mm y^-1) of 15% Cr (Hf) ODS steel in 3 M, 6 M and 9 M HNO₃, comparable to that of type 304L stainless steel was observed. The improved corrosion resistance of 15% Cr (Hf) ODS steel was attributed to enrich (20 at. %) and protective Al₂O₃ layer formation in addition to Cr₂O₃ in the passive film.

• Periodical: Advanced Materials Research (Volume 794)
• Pages: 575-582
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.794.575
• Online since: September 2013
• Authors: S. Ningshen, M. Sakairi, K. Sukuki, S. Ukai
• Keywords: F/M Steel, Nitric Acid Corrosion, ODS Steels, Passive Films, SEM, XPS

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