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Title: Temperature-dependence of oxidation and carburization of Grade 91 steel in CO2 containing impurities

Journal Article · · Corrosion Science
 [1];  [1];  [1]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States)

Future CO2 based power systems require steels resistant to corrosion in high-temperature CO2-rich environments. Candidate 9Cr ferritic-martensitic steels degrade by surface oxidation and substrate carburization, both of which can be strongly affected by impurities in the CO2. In this study we examined Grade 91 steel exposed to 95%CO2-4%H2O-1%O2 with/without 0.1% SO2 at 1 atm and 550, 600, 650° C for up to 3000 h to establish the temperature-dependence of these processes. SO2 showed little effect on oxidation at 550-600° C but reduced carburization, while the combination of SO2 and faster alloy diffusion at 650° C resulted in significant reduction in both oxidation and carburization.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
89243318CFE000003
OSTI ID:
1888227
Journal Information:
Corrosion Science, Journal Name: Corrosion Science Vol. 198; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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