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High-Temperature Corrosion of Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C Alloy in Ar/0.2%SO2 Gas

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Abstract

Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C alloy was corroded at 900–1100 °C in Ar/0.2%SO2 gas for 50–300 h to study its corrosion behavior in a corrosive SO2-environment. It displayed superior corrosion resistance at 900–1000 °C for 50–100 h, forming triple-layered oxide scales consisting of an outer rutile-TiO2 layer, an intermediate α-Al2O3 layer, and an inner (rutile-TiO2, α-Al2O3)-mixed layer. Preferential oxidation of Ti and Al delayed harmful sulfidation. Since there was a large amount of Al in the alloy, relatively thick intermediate α-Al2O3 layers formed. Nb, W, and Si additionally suppressed rutile formation. Nb, W, Si, and Cr tended to accumulate in subscale mainly due to their thermodynamic nobility compared to Ti and Al. When corroded at 1000 °C for 300 h, the alloy suffered nodular corrosion, forming coarse, discrete oxide nodules consisting of TiO2 and Al2O3. When corroded at 1100 °C for 100 h, the alloy became nonprotective owing to the formation of a thick, loosely adherent scale consisting of outer (TiO2, Al2O3)-oxides and inner (Nb1-xS, TiS)-sulfides, beneath which (TixW1-x, Al3Nb)-mixed subscale existed. Corrosion was generally governed by outward diffusion of Ti, Al, Cr, and W and inward diffusion of oxygen and sulfur. The outward diffusing tendency of Nb and Si was weak. As corrosion temperature and time increased, sulfur diffused more across the oxide scale, eventually resulting in formation of Nb1-xS and TiS sulfides.

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Acknowledgement

This work was supported by the National Research Council of Science and Technology (NST) Grant by the Korea government (MSIT) (No. CRC-15-07-KIER).

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Authors and Affiliations

  1. Center for Energy Materials Metrology, Korea Research Institute of Standards and Science, Daejon, 34113, South Korea

    Junhee Hahn

  2. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, South Korea

    Shi Yuke, Xiao Xiao & Dong Bok Lee

  3. Titanium Department, Korea Institute of Materials Science, Changwon, 51508, South Korea

    Seong Woong Kim, Seung Eon Kim & Jae Kwon Kim

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  1. Junhee Hahn
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  2. Shi Yuke
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Hahn, J., Yuke, S., Kim, S.W. et al. High-Temperature Corrosion of Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C Alloy in Ar/0.2%SO2 Gas. Oxid Met 94, 113–125 (2020). https://doi.org/10.1007/s11085-020-09981-8

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  • DOI: https://doi.org/10.1007/s11085-020-09981-8

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