High Temperature Corrosion Behavior of Si-Containing Alloys in the Gas Phase of Air-(Na₂SO₄+25.7mass%NaCl)

Abstract:

The objective of this study is to develop an excellent corrosion resistant alloy for high temperature coating applications. The Si-containing alloys consisting of CoNiCrAlY and CrSi₂ alloys with varying Si and Ni content respectively were prepared by spark plasma sintering (SPS) technique. The corrosion behavior of these alloys was investigated in the gas phase of air-(Na₂SO₄+25.7mass%NaCl) at elevated temperatures of 923, 1073 and 1273K. The results showed that CoNiCrAlY alloy with 30mass% Si content and CrSi₂ alloy with 10mass% Ni content were the most effective materials for application in the gas phase of air-(Na₂SO₄+25.7mass%NaCl) due to the formation of protective Al₂O₃/SiO₂ and SiO₂ scale, respectively. Therefore, it is realized that CoNiCrAlY-30mass% Si and CrSi₂-10mass% Si coating are very effective for improving of high temperature corrosion resistance of STBA21 steel.

• Periodical: Materials Science Forum (Volume 696)
• Pages: 272-277
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.696.272
• Online since: September 2011
• Authors: Toto Sudiro, Tomonori Sano, Akira Yamauchi, Shoji Kyo, Osamu Ishibashi, Masaharu Nakamori, Kazuya Kurokawa
• Keywords: CoNiCrAlY-Si, Cr-Si-Ni, High Temperature Corrosion, Na₂SO₄+25.7mass%NaCl

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