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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

Authors
  • Yuke, Shi1
  • Kim, Seong Woong2
  • Hahn, Junhee3
  • Lee, Dong Bok1
  • 1 Sungkyunkwan University, School of Advanced Materials Science and Engineering, Suwon, 16419, South Korea , Suwon (South Korea)
  • 2 Korea Institute of Materials Science, Titanium Department, Changwon, 51508, South Korea , Changwon (South Korea)
  • 3 Korea Research Institute of Standards and Science, Center for Energy Materials Metrology, Daejon, 34113, South Korea , Daejon (South Korea)
Type
Published Article
Journal
Oxidation of Metals
Publisher
Springer US
Publication Date
Feb 09, 2019
Volume
91
Issue
5-6
Pages
677–689
Identifiers
DOI: 10.1007/s11085-019-09902-4
Source
Springer Nature
Keywords
License
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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.

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