Effect of CrCl2 or VCl2 addition on corrosion of Cr metal in molten MgCl2-KCl
Source abstract
Abstract
This study investigated the effects of adding 1 wt% CrCl 2 and VCl 2 on Cr corrosion in eutectic MgCl 2 -KCl at 773 K under an argon atmosphere, using electrochemistry and immersion experiments. The redox potential of V 3+ /V 2+ was more negative than Cr 2+ /Cr, suggesting that V 2+ can protect Cr from dissolution. Additionally, the morphological and chemical evolutions investigated with scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) confirmed the corrosion protection mechanism of adding CrCl 2 and VCl 2 . These findings are crucial for further improving the stability of containment alloys in molten salt applications. • CrCl 2 and VCl 2 additives effectively protect Cr metal from corrosion in molten MgCl 2 -KCl. • V2+ is preferentially oxidized over Cr 2+ , providing cathodic protection for Cr. • STEM, EDS, and EELS analyses confirm MgO and Cr 2 O 3 as corrosion products on Cr surfaces. • EELS analysis shows that Cr 3+ and V 3+ in the salt are due to oxidation of CrCl 2 and VCl 2 additives by impurities.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Molten salt chemistry and electrochemical processes · Bauxite Residue and Utilization · Metallurgical Processes and Thermodynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. Progress in research and development of molten chloride salt technology for next generation concentrated solar power plants10.1016/j.eng.2020.06.027 ↗
2. Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 2: Materials screening performance10.1016/j.est.2020.101381 ↗
3. Corrosion in the molten fluoride and chloride salts and materials development for nuclear applications10.1016/j.pmatsci.2018.05.003 ↗
4. Molten salt for advanced energy applications: a review10.1016/j.anucene.2021.108924 ↗
5. Sridharan · 2012
6. Susskind · 1960
7. Hot corrosion in gas turbine components10.1016/S1350-6307(00)00035-2 ↗
8. Effects of heat treatment on microstructure and mechanical properties of Inconel 625 alloy fabricated by wire arc additive manufacturing process10.1016/S1003-6326(20)65439-5 ↗
9. Precipitation behavior of grain boundary M23C6 and its effect on tensile properties of Ni–Cr–W based superalloy10.1016/j.msea.2012.03.092 ↗
10. Thermodynamic and kinetic consideration on the corrosion of Fe, Ni and Cr beneath a molten KCl–ZnCl2 mixture10.1016/j.corsci.2005.02.015 ↗
11. Hot corrosion behavior of commercial alloys in thermal energy storage material of molten MgCl2/KCl/NaCl under inert atmosphere10.1016/j.solmat.2018.04.025 ↗
12. Engineering molten MgCl2–KCl–NaCl salt for high-temperature thermal energy storage: review on salt properties and corrosion control strategies10.1016/j.solmat.2021.111344 ↗
13. Formation of three-dimensional bicontinuous structures via molten salt dealloying studied in real-time by in situ synchrotron X-ray nano-tomography10.1038/s41467-021-23598-8 ↗
14. Heterogeneous 3D morphological evolution of Ni microparticles in molten salts: visualized by operando synchrotron X-ray nano-tomography
15. Materials corrosion in molten LiF-NaF-KF eutectic salt under different reduction-oxidation conditions
16. High-temperature corrosion behavior of Ni–16Mo–7Cr–4Fe superalloy containing yttrium in molten LiF–NaF–KF salt10.1016/j.jnucmat.2015.05.007 ↗
17. Effect of Li metal addition on corrosion control of Hastelloy N and stainless steel 316H in molten LiF-NaF-KF10.1016/j.jnucmat.2021.153098 ↗
18. High temperature electrochemical engineering and clean energy systems
19. Effect of excess Mg to control corrosion in molten MgCl2 and KCl eutectic salt mixture10.1016/j.corsci.2021.109914 ↗
20. Effect of Mn and Zn inhibitors on the corrosion of incoloy 800H in the MgCl2–KCl molten salt
21. Square-wave voltammetry: a review on the recent progress10.1002/elan.201300369 ↗
22. A study of reversibility of processes at the dropping mercury electrode by changing discontinually the polarising voltage10.1135/cccc19480105 ↗
23. Square-wave polarography10.1039/an9527700685 ↗
24. Osteryoung · 1986 · 209
25. Zoski · 2006
26. Electrochemical study on the kinetic properties of Fe2+/Fe, Ni2+/Ni, Cr2+/Cr and Cr3+/Cr2+ in molten MgCl2-KCl-NaCl salts10.1149/1945-7111/abdafc ↗
27. Electrochemical investigation of the stable chromium species in molten FLINAK
28. Concentration measurements in molten chloride salts using electrochemical methods10.1149/1945-7111/ac436a ↗
29. Electrochemical behavior of cerium (III) in NaCl–KCl molten salt
30. R.A. Skar, Chemical and electrochemical characterisation of oxide/hydroxide impurities in the electrolyte for magnesium production, Fakultet for naturvitenskap og teknologi, 2001, http://hdl.handle.net/11250/244438.
31. Oxide complexes in alkali-alkaline-earth chloride melts10.3891/acta.chem.scand.45-0145 ↗
32. Determining oxidation states of transition metals in molten salt corrosion using electron energy loss spectroscopy10.1016/j.scriptamat.2021.113790 ↗
33. High temperature corrosion of inconel 600 in NaCl-KCl molten salts
34. Corrosion behavior of NO6600 alloy in molten chloride salts
35. Engineering database of liquid salt thermophysical and thermochemical properties
36. Corrosion behaviour of various model alloys with NaCl–KCl coating10.1016/j.matchemphys.2005.03.015 ↗