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Effect of Cr Content on Hot Corrosion Behavior of Inconel Alloys in Molten LiCl–Li2O

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Abstract

The hot corrosion behaviors of Inconel alloys with different Cr contents (Inconel 600, 601, and 690), which are used widely in nuclear plants, were investigated in molten LiCl–Li2O salts. The hot corrosion behaviors were studied by measuring the mass and attack depth changes, surface and cross-sectional morphologies and elemental distributions, and compositional changes at the subscale and substrate scale as well as the spalled oxide scale. At 288 h, the weight losses of Inconel 601 and Inconel 690 were approximately four and twelve times higher, respectively, than that of Inconel 600. The corrosion products of all tested alloys were Cr2O3, NiO, and FeCr2O4. Inconel 600, which exhibited a dense and continuous external corrosion layer and an internal corrosion layer with localized corrosion behavior, exhibited superior corrosion resistance compared with those of Inconel 601 and 690, which showed a spalled external corrosion layer and an internal corrosion layer with uniform corrosion behavior. Thus, the corrosion resistance of the Inconel alloys tested in the hot lithium molten salts in an oxidizing atmosphere is closely related to the contents of the primary alloying elements in the alloys. Of the various alloys analyzed in this study, Inconel 600 exhibited the highest corrosion resistance. Thus, a Cr content of 16.30 wt% or less, Ni content of at least 73.66 wt%, and Fe content considerably lower than 8.15 wt% can result in excellent corrosion resistance.

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Acknowledgements

The authors acknowledge the financial support of the Ministry of Trade, Industry & Energy (MOTIE), Korea.

Funding

This work was funded by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0023676, HRD Program for Industrial Innovation) and the Industrial Strategic Technology Development Program of MOTIE (High Purity Metal Refining Technology for Titanium Metal with Zero Toxic Gas Emission (Grant Number 20010585)).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Korea

    Kyu-Seok Lim, Woo-Seok Choi, Wan-Bae Kim & Jong-Hyeon Lee

  2. Rapidly Solidified Materials Research Center (RASOM), Chungnam National University, Daejeon, 34134, Korea

    Soo-Haeng Cho & Jong-Hyeon Lee

  3. Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Korea

    Jong-Hyeon Lee

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KSL: Conceptualization, Formal analysis, Investigation, Methodology, Validation, Visualization, Draft preparation. WSC: Software, Methodology. WBK: Investigation, Validation. SHC: Conceptualization, Data curation, JHL: Conceptualization, Supervision, Data Curation, Project administration. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Jong-Hyeon Lee.

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Lim, KS., Choi, WS., Kim, WB. et al. Effect of Cr Content on Hot Corrosion Behavior of Inconel Alloys in Molten LiCl–Li2O. High Temperature Corrosion of mater. 100, 345–358 (2023). https://doi.org/10.1007/s11085-023-10180-4

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