Synergistic effect of multiple molten salts on hot corrosion behaviour of Ni-based single crystal superalloy

Yang, Yanqiu; Zhao, Ye; Zhou, Wen; Lu, Guoxin; Pei, Haiqing; Yue, Zengji

doi:10.1016/j.corsci.2022.110381

Cited by 24 publications

(2 citation statements)

References 52 publications

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“…Zhang et al [3] investigated that the corrosion products of Inconel 718 consisted mainly of an outer layer composed of Ni 2 CrO 4 , Cr 2 O 3 , and Fe 3 O 4 and an inner layer composed of Ni 3 S 2 . Yang's team [4] investigated the hot corrosion behavior of nickel-based single crystals at 900 • C in three different salt mixtures. It was revealed that, during the thermal corrosion process, in the γ ′ depleted layer of nickel-based single-crystal superalloys, the corrosion products were mainly linear TaS 2 and pitted CrS.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Hot Salt Corrosion Behavior of Three Nickel-Based Single-Crystal Superalloys at 900 °C

Li,

Liu,

et al. 2024

Crystals

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A study of the hot salt corrosion behavior of three nickel-based single-crystal superalloys at 900 °C was conducted. We discovered that the corrosion layer on each alloy was distinctly enriched with Mo, Ni, S, and O, primarily comprising sulfides and oxides. Notably, variations in oxygen distribution across the alloys revealed that the elemental composition plays a pivotal role in their corrosion resistance. These insights not only advance our understanding of the mechanisms driving thermal corrosion in nickel-based single-crystal superalloys but also lay the groundwork for designing alloys with enhanced durability tailored to high-temperature applications. This research marks a significant step toward the optimal design and utilization of superalloys in sectors demanding exceptional material stability under thermal stress.

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Section: Introductionmentioning

confidence: 99%

A Study of the Hot Salt Corrosion Behavior of Three Nickel-Based Single-Crystal Superalloys at 900 °C

Li,

Liu,

et al. 2024

Crystals

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“…A LN element concentration limit to enable a connected silver path with Ag essentially frozen in place can be defined by a percolation or advanced percolation processes 28 . The implication of bulk diffusion-assisted dealloying is that the corrosion process is now governed by a myriad of factors at different length scales that introduces further variability to the corrosion morphology, 29 including grain size, point defectsolute interaction 30,31 and electrochemical potential. 25 For instance, if the grain boundary diffusion of LN element is much faster than bulk lattice diffusion (e.g.…”

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confidence: 99%

Morphological Evolution and Dealloying During Corrosion of Ni20Cr (wt.%) in Molten FLiNaK Salts

Chan,

Romanovskaia,

Mills

et al. 2024

J. Electrochem. Soc.

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In this work, the dealloying corrosion behavior of the FCC Ni20Cr (wt.%) in molten LiF-NaF-KF (FLiNaK) salts at 600 °C under varying applied potentials was investigated. Using in-operando electrochemical techniques and a multi-modal suite of characterization methods, we connect electrochemical potential, thermodynamic stability, and electro-dissolution kinetics to the corrosion morphologies. Notably, under certain potential regimes, a micro-scale bicontinuous structure, characterized by a network of interconnected ligaments and pores with the composition of the more noble (MN) element, becomes prominent. At other potentials both MN and less noble (LN) elements dealloy but at different rates. The dealloying process consists of bulk and grain boundary diffusion of Cr to the metal/salt interface, interphase Cr oxidation, accompanied by surface diffusion of Ni to interconnected ligaments. This process is predominately controlled by charge transfer, resulting in the formation of Cr(II) and Cr(III) species at a constant rate of attack for a period of 10,000 seconds. At higher potentials, the bicontinuous porous structure undergoes further surface coarsening. Concurrently, Cr(II), Cr(III), and Ni(II) begin to dissolve, with the dissolution of Ni occurring at a significantly slower rate. When solid state transport of Cr is exceeded by the interfacial rates, dealloying depths are limited.

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High temperature corrosion performance of Inconel 625 hard overlays deposited on stainless steel substrate

Nachimuthu,

Gosipathala,

Arasappan

et al. 2024

Materials & Corrosion

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In elevated conditions, austenitic stainless steels suffer intense damage by corrosion because of the severe oxide scale development. Giving stainless steel a corrosion‐resistant surface coating can prevent excessive damage. In this case, welding‐based overlaying is a potential method to restore the damaged parts as it has a higher productivity rate. This investigation articulates the corrosion resistance behavior of the multiple overlapped Inconel 625 (IN625) weld overlays on the AISI 316L substrate plate. The corrosion resistance at elevated temperatures was investigated with kinetic curves, further revealing the corrosion products from the sample surface. Characterization techniques like scanning electron microscopy with energy‐dispersive spectroscopy, X‐ray diffraction, and Raman spectroscopy were employed to analyze the corrosion products. Hot corrosion kinetics in the molten salt environment (Na2SO4 + V2O5) revealed that the IN625 overlay samples gained a weight of 40.15 mg/cm2, and the substrate had a weight gain of 65.42 mg/cm2. From the hot oxidation kinetics, it is evident that the mass gained by the substrate is more than twice that of the Inconel overlay sample. Furthermore, the formation of oxides and spinel phases rich in nickel (NiO, NiCr2O4) highly influenced the corrosion kinetics of the multiple overlapped IN625 overlay sample. The AISI 316L substrate sample revealed the existence of critical oxide phases such as Fe2O3 and Cr2O3, which were lesser and did not influence the corrosion resistance at 900°C. In the present investigation, the multiple overlapped IN625 weld overlay offered excellent corrosion resistance at high temperature compared to the AISI 316L.

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Synergistic effect of multiple molten salts on hot corrosion behaviour of Ni-based single crystal superalloy

Cited by 24 publications

References 52 publications

A Study of the Hot Salt Corrosion Behavior of Three Nickel-Based Single-Crystal Superalloys at 900 °C

A Study of the Hot Salt Corrosion Behavior of Three Nickel-Based Single-Crystal Superalloys at 900 °C

Morphological Evolution and Dealloying During Corrosion of Ni20Cr (wt.%) in Molten FLiNaK Salts

High temperature corrosion performance of Inconel 625 hard overlays deposited on stainless steel substrate

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