High temperature corrosion of gas turbine materials with ash deposition in methane gas combustion environment

Y. A.N. Liang, Syuichi Inagaki, Yomei Yoshioka

Research output: Contribution to journalConference articlepeer-review

Abstract

Beyond high temperature oxidation, sulfation and molten salt corrosion, corrosion from ash/salt deposits has also been a serious problem for industrial gas turbine components such as nozzle guide vanes and rotor blades. This study focuses on hot corrosion behaviors caused by ash deposits on a nickel-based superalloy80H, a cobalt-based superalloy414, a CoNiCrAlY coating and a thermal barrier coating (TBC). Specimens were immersed in ashes and experiments were conducted in a methane gas combustion environment at 730°C, 850°C, and 950°C for 200h. Raw ash and synthetic ash were used for the ash deposition experiments. A coal gasification plant supplied the raw ash and the synthetic ash was combined artificially with Na2SO4, SiO2, V2O5, NaCl, Fe3O4 and Fe2O3. To evaluate the accelerated corrosion effects of ash deposits, experiments were also conducted in the same combustion environment without ash deposition for 1000h. After these tests, cross sectional observations were made by a scanning electron microscope (SEM) and an electron probe micro analyzer (EPMA). Results showed that sulfur concentrated within the uncoated superalloy80H and superalloy414, and silicon invaded along the grain boundary of superalloy414.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume2005-April
Publication statusPublished - 2005 Jan 1
Externally publishedYes
EventCorrosion 2005 - Houston, United States
Duration: 2005 Apr 32005 Apr 7

Keywords

  • Ash deposition
  • Blade
  • Gas turbine
  • Hot corrosion
  • Oxidation
  • Sulfidation and vanadium attack
  • Superalloy

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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