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Effect of pressure on high-temperature oxidation of Ni alloys in supercritical CO2 containing impurities

Journal Article · · Corrosion Science
 [1];  [2];  [1]
  1. National Energy Technology Laboratory (NETL), Albany, OR (United States)
  2. National Energy Technology Laboratory (NETL), Albany, OR (United States). Support Contractor
Direct supercritical CO2 (sCO2) power cycles require structural materials compatible with hot sCO2 containing high levels of water and oxygen impurities. Chromia-forming Ni-based superalloys, which are leading candidates at temperatures > 600 °C, have shown good compatibility in pure sCO2, however potential impurity effects are not well understood. In this report we exposed several commercial Ni-based alloys to 95%CO2-4%H2O-(1-3)%O2 at 750 °C and 0.1 or 20 MPa for 2500 h. Protective chromia scales formed in all cases. Nevertheless, water vapor-assisted oxide volatilization clearly occurred at high pressure. The volatilization rates decreased with time, but still represent a potentially serious compatibility issue in real, high-velocity, sCO2 systems.
Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE; USDOE Office of Fossil Energy (FE)
OSTI ID:
1969017
Alternate ID(s):
OSTI ID: 2000164
Journal Information:
Corrosion Science, Journal Name: Corrosion Science Journal Issue: N/A Vol. 215; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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