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A Comparative Study of High Temperature Corrosion of Al2O3, SiO2 and Al2O3–SiO2 Forming Alloys in a Na2SO4–NaCl Atmosphere

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Abstract

The present paper is designed to provide a summary of our study on the high temperature corrosion of Al2O3, SiO2 and Al2O3–SiO2 forming alloys in the gas phase and liquid phase of Na2SO4–NaCl system by comparing their corrosion resistance at 1000 °C. The obtained results show that the alumina-forming alloy experiences severe internal corrosion in the gas phase compared to in the liquid phase due to oxide cracking. This results in an increase in the inward diffusion and/or penetration of constituents of the salts and oxygen to form internal Al-oxide and Cr-sulfides. In the liquid phase, however, the formation of yttrium sulfide beneath a continuous double oxides layer of Al5Y3O12 and Al2O3 may be related to the high affinity of yttrium for sulfur. On the other hand, it is apparent from the cross-sectional observations that a SiO2 and Al2O3–SiO2 forming alloys form a continuous and dense oxides layer, and demonstrate a high resistance against internal oxidation and corrosion in both corrosive environments.

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Acknowledgments

Grateful acknowledgement is made of the financial support from the Japan Society for the Promotion of Science (JSPS). The authors wish to thank Akira Yamauchi, Ph.D. for his help and technical guidance.

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Author notes

  1. Tomonori Sano

    Present address: Mitsubishi Heavy Industries, Ltd., Takasago, 676-8686, Japan

Authors and Affiliations

  1. Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Toto Sudiro & Tomonori Sano

  2. The Kansai Electric Power Co. Inc., Amagasaki, 661-0974, Japan

    Shoji Kyo

  3. Osaka Fuji Corporation, Takaishi, 592-0001, Japan

    Osamu Ishibashi

  4. High Temperature Corrosion & Protection Technosearch Co. Ltd., Takasago, 676-0082, Japan

    Masaharu Nakamori

  5. CAREM, Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Kazuya Kurokawa

Authors
  1. Toto Sudiro
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  2. Tomonori Sano
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  3. Shoji Kyo
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  4. Osamu Ishibashi
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  5. Masaharu Nakamori
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  6. Kazuya Kurokawa
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Corresponding authors

Correspondence to Toto Sudiro or Kazuya Kurokawa.

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Sudiro, T., Sano, T., Kyo, S. et al. A Comparative Study of High Temperature Corrosion of Al2O3, SiO2 and Al2O3–SiO2 Forming Alloys in a Na2SO4–NaCl Atmosphere. Oxid Met 80, 589–597 (2013). https://doi.org/10.1007/s11085-013-9398-7

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  • DOI: https://doi.org/10.1007/s11085-013-9398-7

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