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Study of Chromium Migration in a Nickel-Based Alloy Using Polarized Neutron Reflectometry and Rutherford Backscattering Spectrometry

  • Mathieu Doucet*
    Mathieu Doucet
    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
    *Email: [email protected]
  • James F. Browning
    James F. Browning
    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
  • Barney L. Doyle
    Barney L. Doyle
    Radiation-Solid Interactions Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
  • Timothy R. Charlton
    Timothy R. Charlton
    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
  • Haile Ambaye
    Haile Ambaye
    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
    More by Haile Ambaye
  • Joohyun Seo
    Joohyun Seo
    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
    More by Joohyun Seo
  • Alessandro R. Mazza
    Alessandro R. Mazza
    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
  • John F. Wenzel
    John F. Wenzel
    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
  • George R. Burns
    George R. Burns
    Radiation-Solid Interactions Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
  • Ryan R. Wixom
    Ryan R. Wixom
    Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
  • , and 
  • Gabriel M. Veith
    Gabriel M. Veith
    Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
Cite this: J. Phys. Chem. C 2022, 126, 1, 605–610
Publication Date (Web):January 4, 2022
https://doi.org/10.1021/acs.jpcc.1c08216
Copyright © 2022 American Chemical Society

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    Abstract

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    Haynes 230 nickel alloy is one of the main contenders for salt containment in the design of thermal energy storage systems based on molten salts. A key problem for these systems is understanding the corrosion phenomena at the alloy–salt interface, and, in particular, the role played by chromium in these processes. In this study, thin films of Haynes 230, which is also rich in chromium, were measured with polarized neutron reflectometry and Rutherford backscattering spectrometry as a function of annealing temperature. Migration of chromium to the surface was observed for films annealed at 400 and 600 °C. Combining the two techniques determined that more than 60% of chromium comprising the as-prepared Haynes 230 layer moves to the surface when annealed at 600 °C, where it forms an oxide layer.

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    • RBS energy spectra, measured reflectivity and spin asymmetry, model parameters, and sample surface composition (PDF)

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