Variation of the Passive Film on Compositionally Concentrated Dual-Phase Al0.3Cr0.5Fe2Mn0.25Mo0.15Ni1.5Ti0.3 and Implications for Corrosion

Inman, S. B.; Wischhusen, M. A.; Qi, J.; Poon, S. J.; Agnew, S. R.; Scully, J. R.

doi:10.1007/s11661-024-07572-9

Title: Variation of the Passive Film on Compositionally Concentrated Dual-Phase Al_0.3Cr_0.5Fe₂Mn_0.25Mo_0.15Ni_1.5Ti_0.3 and Implications for Corrosion

Journal Article · 01 October 2024 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI: https://doi.org/10.1007/s11661-024-07572-9 · OSTI ID:2478009

Inman, S. B. ^[1]; Wischhusen, M. A. ^[2]; Qi, J. ^[3]; Poon, S. J. ^[4]; Agnew, S. R. ^[4]; Scully, J. R. ^[4]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies; Univ. of Virginia, Charlottesville, VA (United States)
Y-12 National Security Complex, Oak Ridge, TN (United States); Univ. of Virginia, Charlottesville, VA (United States)
Northwestern Univ., Evanston, IL (United States); Univ. of Virginia, Charlottesville, VA (United States)
Univ. of Virginia, Charlottesville, VA (United States)

The passive film on a dual-phase Al_0.3Cr_0.5Fe₂Mn_0.25Mo_0.15Ni_1.5Ti_0.3 FCC + Heusler (L2₁) compositionally concentrated alloy formed during extended exposure to an applied potential in the passive range in dilute chloride solution was characterized. Each phase, with its own distinct composition of passivating elements, formed unique passive films separated by a heterophase interface. High-resolution, surface sensitive characterization enabled chemical analysis of the passive film formed over individual phases. The film formed over the L2₁ phase had a higher concentration of Al, Ni, and Ti, while the film formed over FCC phase was of similar thickness but contained comparatively higher Cr, Fe, and Mo concentrations, consistent with the differences in bulk microstructure composition. The passive film was continuous across phase boundaries and the distribution of passivating elements (Al, Cr, and Ti) indicated both phases were independently passivated. Spatially resolved analysis of the surface chemistry of the dual-phase CCA revealed that the cation with the highest composition in passive film formed on the FCC phase was Cr (52.4 at. pct) and for the L2₁ phase was Ti (53.1 at. pct) despite the bulk concentration of each element being below 20 at. pct in their respective phases. Al, Cr, and Ti were enriched in both phases within the passive film relative to their respective bulk compositions. In parallel studies, single-phase alloys with compositions representative of the FCC and L2₁ phases were synthesized to evaluate the corrosion behavior of each phase in isolation. The corrosion behavior of the dual-phase alloy showed passivity evidenced by a pitting potential of 0.615 V_SCE in 0.01 M NaCl. The pitting potential and other electrochemical parameters suggested a combination of behaviors of both single-phase samples, suggesting that the global corrosion behavior may be represented by a composite theory applied to phases, their area fractions, and interphase length. However, the interphase in the dual-phase CCA was a local corrosion initiation site and may limit localized corrosion protectiveness. The alloy design implications for optimization of second phase structure and morphology are discussed.

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Research Organization:: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE

Grant/Contract Number:: NA0001942

OSTI ID:: 2478009

Report Number(s):: Metricresolution

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 12 Vol. 55; ISSN 1073-5623

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Design and Discovery of Compositionally Complex Alloys that Include High Corrosion Resistance Inman, S. B.; Scully, J. R. Corrosion, Vol. 80, Issue 3 https://doi.org/10.5006/4451	journal	January 2024

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Title: Variation of the Passive Film on Compositionally Concentrated Dual-Phase Al0.3Cr0.5Fe2Mn0.25Mo0.15Ni1.5Ti0.3 and Implications for Corrosion

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Title: Variation of the Passive Film on Compositionally Concentrated Dual-Phase Al_0.3Cr_0.5Fe₂Mn_0.25Mo_0.15Ni_1.5Ti_0.3 and Implications for Corrosion