Aqueous passivation of multi-principal element alloy Ni38Fe20Cr22Mn10Co10: Unexpected high Cr enrichment within the passive film

Gerard, Angela Y.; Han, Junsoo; McDonnell, Stephen J.; Ogle, Kevin; Kautz, Elizabeth J.; Schreiber, Daniel K.; Lu, Pin; Saal, James E.; Frankel, Gerald S.; Scully, John R.

doi:10.1016/j.actamat.2020.07.024

Title: Aqueous passivation of multi-principal element alloy Ni₃₈Fe₂₀Cr₂₂Mn₁₀Co₁₀: Unexpected high Cr enrichment within the passive film

Journal Article · Fri Jul 17 00:00:00 EDT 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.07.024· OSTI ID:1650717

Gerard, Angela Y. ^[1]; Han, Junsoo ^[1]; McDonnell, Stephen J. ^[1]; Ogle, Kevin ^[2]; Kautz, Elizabeth J. ^[3];

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University of Virginia, Charlottesville, VA (United States)
Institut de Recherche Chimie Paris (IRCP), Paris (France)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Questek Innovations LLC, Evanston, IL (United States)
Citrine Informatics, Redwood City, CA (United States)
Ohio State University, Columbus, OH (United States)

The aqueous passivation of a non-equiatomic Ni₃₈Fe₂₀Cr₂₂Mn₁₀Co₁₀ - at.% (Ni₄₀Fe₂₀Cr₂₀Mn₁₀Co₁₀ - wt.%) multi-principal element alloy (MPEA) was investigated in 0.1 M NaCl at pH 4 and compared to a conventional binary Ni₇₆Cr₂₄ – at.% (Ni₇₈Cr₂₂ – wt.%) alloy. The electrochemical behavior and oxide film characteristics were explored utilizing in-situ electrochemical and ex-situ surface-sensitive techniques. The passive film composition, thickness, and elemental valence states, as well as, the fate of each element were studied by in-situ atomic emission spectro-electrochemistry, ex-situ X-ray photoelectron spectroscopy, and atom probe tomography. The Ni₃₈Fe₂₀Cr₂₂Mn₁₀Co₁₀ MPEA demonstrated slightly better corrosion resistance compared to the binary Ni₇₆Cr₂₄, alloy. Passive films on the MPEA contained primarily Cr, and small amounts of Ni, Fe, Co and Mn, while dissolution of Ni, Fe, Co was observed. Ni⁰ was enriched at the oxide/metal interface while Cr was depleted. Enrichment of Cr in the passive film occurred to a greater extent in the MPEA than for the Ni-Cr binary alloy. As a result, enrichment factors were determined and the origins of enrichment are discussed.

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Research Organization:: Univ. of Virginia, Charlottesville, VA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Questek Innovations LLC, Evanston, IL (United States); Citrine Informatics, Redwood City, CA (United States); The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016584; AC05–76RLO1830

OSTI ID:: 1650717

Alternate ID(s):: OSTI ID: 1647255; OSTI ID: 1670001

Report Number(s):: PNNL-SA-154404

Journal Information:: Acta Materialia, Vol. 198; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Aqueous passivation of multi-principal element alloy Ni38Fe20Cr22Mn10Co10: Unexpected high Cr enrichment within the passive film

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Title: Aqueous passivation of multi-principal element alloy Ni₃₈Fe₂₀Cr₂₂Mn₁₀Co₁₀: Unexpected high Cr enrichment within the passive film