Fireside Corrosion of Austenitic Tube Materials for Advanced USC Boilers

Abstract:

Laboratory corrosion test of Ni-base alloys and austenitic stainless steels was performed in 0.1/0.5% SO₂ -5%O₂ -10%H₂O -15%CO₂ –N₂ at 650-750°C for 20 h. Mixture of 1.5m/o Na₂SO₄ -1.5m/o K₂SO₄ -1m/o Fe₂O₃ was used as a corrosive. The effect of SO₃ concentration on both the onset temperature of melting and the thermal stability of the synthetic coal-ash mixture was investigated by differential scanning calorimetry. Concentration of SO₂/SO₃ affected the corrosion of steels and alloys at 650°C and 700°C drastically.

• Periodical: Materials Science Forum (Volume 696)
• Pages: 206-211
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.696.206
• Online since: September 2011
• Authors: Nobuo Otsuka
• Keywords: Advanced-USC Boilers, Boiler Tube Materials, Fused-Salt Corrosion, High Temperature Corrosion, Hot Corrosion

References

[1] J.L. Blough, G.J. Stanko: CORROSION97, paper no. 140, NACE, Houston TX, (1997).

[2] C. Cain, W. Nelson: Trans. ASME. J. Eng. Power: Series A, Vol. 83 (1961), p.768.

[3] R.A. Rapp: Corrosion Vol. 42 (1986), p.568.

[4] R. Blum: Proc. Int. Conf. on New Developments on Metallurgy and Applications of High Strength Steels, Buenos Aires, May 28, (2008).

[5] for example, see G.Y. Lai: High-Temperature Corrosion of Engineering Alloys, ASM International, Materials Park Ohio, USA (1990), p.130.

[6] Y. Matsunaga, H. Nakagawa, and K. Nagakawa: Proc. 2009 Spring Meeting of the Japan Society of Corrosion Engineering, C-201 (2009), in Japanese.

[7] N. Komai, Y. Tanaka, and M. Hokano: Proc. JIM fall 145th meeting, S9·21 (2009), p.176, in Japanese.

[8] N. Otsuka, Proceedings of EUROCORR 2009, the European Corrosion Congress, 6-10 September 2009, Nice France, (2009).

[9] Y. Fukuda: The Current Issue Case Histories in Corrosion Failure Analysis and Corrosion Diagnotics, ed.T. Ishihara, Technosystem, Tokyo, p.429 (2008), in Japanese.

[10] A. Iseda, H. Okada, H. Semba, M. Igarashi, and Y. Sawaragi, Proc. Symposium on Heat Resistant Steels and alloys for Advanced USC Power Plants 2007, July 3-6 2007, Korea Institute of Science and technology, Seoul, Korea.

[11] W. Nelson, C. Cain: Trans. ASME. J. Eng. Power Series A, Vol. 82 (1960), p.194.

[12] L.P. Cook, H.F. McMurdie: Phase Diagrams for Ceramists, Volume VII, The American Ceramic Society, Westerville, Ohio, 1989, p.51.

[13] N. Otsuka, Y. Tsukaue, K. Nakagawa, Y. kawahara, and K. Yukawa: CORROSION97, paper No. 157, NACE, Houton TX, (1997).

[14] K.L. Luthra, D.A. Shores: J. Electrochem. Soc. Vol. 127(1980), p.2202.