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Title: Mechanistic insights into the oxidation behavior of Ni alloys in high-temperature CO2

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [1];  [1]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  3. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1366428
Alternate Identifier(s):
OSTI ID: 1495539
Report Number(s):
NETL-PUB-20826
Journal ID: ISSN 0010-938X
Resource Type:
Accepted Manuscript
Journal Name:
Corrosion Science
Additional Journal Information:
Journal Volume: 125; Journal ID: ISSN 0010-938X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Oleksak, Richard P., Baltrus, John P., Nakano, Jinichiro, Nakano, Anna, Holcomb, Gordon R., and Dogan, Omer N. Mechanistic insights into the oxidation behavior of Ni alloys in high-temperature CO2. United States: N. p., 2017. Web. https://doi.org/10.1016/j.corsci.2017.06.005.
Oleksak, Richard P., Baltrus, John P., Nakano, Jinichiro, Nakano, Anna, Holcomb, Gordon R., & Dogan, Omer N. Mechanistic insights into the oxidation behavior of Ni alloys in high-temperature CO2. United States. https://doi.org/10.1016/j.corsci.2017.06.005
Oleksak, Richard P., Baltrus, John P., Nakano, Jinichiro, Nakano, Anna, Holcomb, Gordon R., and Dogan, Omer N. Thu . "Mechanistic insights into the oxidation behavior of Ni alloys in high-temperature CO2". United States. https://doi.org/10.1016/j.corsci.2017.06.005. https://www.osti.gov/servlets/purl/1366428.
@article{osti_1366428,
title = {Mechanistic insights into the oxidation behavior of Ni alloys in high-temperature CO2},
author = {Oleksak, Richard P. and Baltrus, John P. and Nakano, Jinichiro and Nakano, Anna and Holcomb, Gordon R. and Dogan, Omer N.},
abstractNote = {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.},
doi = {10.1016/j.corsci.2017.06.005},
journal = {Corrosion Science},
number = ,
volume = 125,
place = {United States},
year = {2017},
month = {6}
}

Journal Article:

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Cited by: 10 works
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    Works referencing / citing this record:

    Effects of Corrosion in Supercritical CO2 on the Microstructural Evolution in 800H Alloy
    journal, May 2018


    The role of metal vacancies during high-temperature oxidation of alloys
    journal, September 2018

    • Oleksak, Richard P.; Kapoor, Monica; Perea, Daniel. E.
    • npj Materials Degradation, Vol. 2, Issue 1
    • DOI: 10.1038/s41529-018-0046-1

    High-Temperature Oxidation of Commercial Alloys in Supercritical CO2 and Related Power Cycle Environments
    journal, June 2018