Corrosion of nickel-based structural materials for nuclear reactors by molten fluoride salt: From bulk content of corrosion products to elemental imaging of corrosion changes

This work is focused on the study of corrosion treatment of molten fluoride salt (MFS) on three candidate structural materials (Ni, ferritic steel with protective Ni coating, and Ni-based alloy). The samples were exposed to an MFS mixture (60 mol% LiF + 40 mol% NaF) at a temperature of 680 °C for 11...

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Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 2018-10, Vol.148, p.113-117
Main Authors: Warchilová, T., Dillingerová, V., Škoda, R., Šimo, T., Matal, O., Vaculovič, T., Kanický, V.
Format: Article
Language:English
Subjects:
Ablation
Corrosion
Corrosion products
Corrosion resistance
Corrosion tests
Electron probe
Electron probes
Elemental imaging
Emission analysis
EPMA
Ferritic stainless steels
Fluorides
Imaging techniques
Inductively coupled plasma mass spectrometry
LA-ICP-MS
Laser ablation
Lasers
Lithium fluoride
Mass spectrometry
Mass spectroscopy
Materials selection
Molten fluoride salt
Ni-based structural material
Nickel
Nickel base alloys
Nickel coatings
Nuclear reactors
Optical emission spectroscopy
Products
Protective coatings
Ratios
Salt
Steel
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Summary:This work is focused on the study of corrosion treatment of molten fluoride salt (MFS) on three candidate structural materials (Ni, ferritic steel with protective Ni coating, and Ni-based alloy). The samples were exposed to an MFS mixture (60 mol% LiF + 40 mol% NaF) at a temperature of 680 °C for 112, 350 and 1000 h. Their corrosion resistance was tested by the determination of the content of corrosion products in MFS by ICP-OES (Inductively Coupled Plasma with Optical Emission Spectrometry) analysis and comparison of elemental ratios. Distinctive differences in the ratios were found for ferritic steel with protective Ni coating. Morphological changes induced by MFS treatment were revealed and studied by EPMA (Electron Probe Micro Analysis) and LA-ICP-MS (Laser Ablation Inductively Coupled Plasma of Mass Spectrometry). Elemental maps of the corroded area were acquired by both methods. The analyses of corrosion products show that the best candidate material is nickel. [Display omitted] •Corrosion of Ni-based materials induced by molten fluoride salt treatment.•Analysis of corrosion products•Imaging of corrosion changes by LA-ICP-MS and EPMA.
ISSN:0584-8547
1873-3565
DOI:10.1016/j.sab.2018.06.010