Mechanistic insights into the oxidation behavior of Ni alloys in high-temperature CO2
Journal Article
·
· Corrosion Science
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
We present results of a Ni superalloy oxidized for short times in high purity CO2 and similarly in Ar containing ≤ 1 ppb O2. A detailed analysis of the oxidized surfaces reveals striking similarities for the two exposure environments, suggesting O2 impurities control the oxidation process in high-temperature CO2. Selective oxidation results in Cr-rich oxide layers grown by 2 outward diffusion, while Cr vacancies left in the metal contribute to significant void formation at the oxide/metal interface. Unlike for most of the alloy surface, the oxidation behavior of secondary phase metal carbides is considerably different in the two environments.
- Research Organization:
- National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 1366428
- Alternate ID(s):
- OSTI ID: 1495539
- Report Number(s):
- NETL-PUB-20826
- Journal Information:
- Corrosion Science, Vol. 125; ISSN 0010-938X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Effects of Corrosion in Supercritical CO2 on the Microstructural Evolution in 800H Alloy
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journal | May 2018 |
The role of metal vacancies during high-temperature oxidation of alloys
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journal | September 2018 |
High-Temperature Oxidation of Commercial Alloys in Supercritical CO2 and Related Power Cycle Environments
|
journal | June 2018 |
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