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High-Temperature Corrosion of Ti–46Al–6Nb–0.5W–0.5Cr–0.3Si–0.1C Alloy in N2/0.1%H2S Gas

  • Shi Yuke
  • Seong Woong Kim
  • Junhee Hahn
  • Dong Bok LeeEmail author
Original Paper
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Abstract

Ti–46Al–6Nb–0.5W–0.5Cr–0.3Si–0.1C alloy was corroded at 800–1100 °C for 200 h in N2/0.1%H2S gas to characterize its corrosion behavior in an aggressive H2S-containing environment. The alloy displayed superior corrosion resistance because Ti and Al preferentially reacted with impurity oxygen in the gas to form TiO2 and Al2O3. It corroded primarily by outward diffusion of Ti, Al, W, and Cr in addition to inward transport of sulfur, nitrogen, and oxygen. Scales were adherent and consisted of an outer TiO2 layer, an intermediate Al2O3 layer, and an inner (TiO2, Al2O3)-mixed layer. TiN and Ti2AlN formed at the scale/matrix interface where sulfur, Nb, W, and Cr segregated.

Keywords

Titanium aluminides TiAl H2S-corrosion Oxidation Sulfidation 
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Notes

Acknowledgements

This work was supported by the project “Development of the High-Efficiency Low-Emission Future Energy Production Technology (EO15580)” of National Research Council of Science and Technology (NST) grant by the Korea government (MSIP) (No. CRC-15-07-KIER).

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Shi Yuke
    • 1
  • Seong Woong Kim
    • 2
  • Junhee Hahn
    • 3
  • Dong Bok Lee
    • 1
    Email author
  1. 1.School of Advanced Materials Science and EngineeringSungkyunkwan UniversitySuwonSouth Korea
  2. 2.Titanium DepartmentKorea Institute of Materials ScienceChangwonSouth Korea
  3. 3.Center for Energy Materials MetrologyKorea Research Institute of Standards and ScienceDaejonSouth Korea

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