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The influence of Nb on hot corrosion behavior of Ni-based superalloy at 800 °C in a mixture of Na2SO4–NaCl

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Abstract

New-type Ni-based superalloys with and without Nb were designed in this study. Their hot corrosion behaviors were investigated at 800 °C with the deposition of a mixture of Na2SO4 and NaCl. The corrosion kinetics was studied by thermogravimetry. Microstructure of the corrosion scales was studied by SEM and the phase constituent was analyzed by XRD. Results showed that the corrosion kinetics followed approximately parabolic law. The corrosion scales on the two Ni-based alloys were comprised of Cr2O3, Al2O3, TiO2, and NiCr2O4. NiO was only detected in the scale on alloy without Nb. Nb2O5 appeared with the addition of 2.0 wt% Nb. No sulfide emerged in the scales. The corrosion scales both exhibited a layered structure. With Nb addition, the hot corrosion resistance of the alloy was notably improved. The action mechanism of Nb was investigated extensively in this study.

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ACKNOWLEDGMENT

This work was financially supported by the Department of Science and Technology of Shandong Province (Grant No. 2007GG10003002), P. R. China.

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Department of Materials Science and Engineering, Shandong University, Ji’nan, Shandong, 250061, People’s Republic of China

    Fei Weng, Kai Wan & Chuanzhong Chen

  2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Ji’nan, Shandong, 250061, People’s Republic of China

    Huijun Yu

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  1. Fei Weng
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Correspondence to Huijun Yu or Chuanzhong Chen.

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Weng, F., Yu, H., Wan, K. et al. The influence of Nb on hot corrosion behavior of Ni-based superalloy at 800 °C in a mixture of Na2SO4–NaCl. Journal of Materials Research 29, 2596–2603 (2014). https://doi.org/10.1557/jmr.2014.282

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