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Corrosion of Structural Alloys in High-Temperature Molten Fluoride Salts for Applications in Molten Salt Reactors
Name
11837_2018_2981_ReferencePDF.pdf
Size
1.15 MB
Format
Adobe PDF
Checksum (MD5)
d89613e6efc0c2630abae699c5657585
Author(s)
Zheng, Guiqiu
Sridharan, Kumar
Date Issued
June 26, 2018
Publisher
Springer US
Version
Author's final manuscript
Abstract
Abstract
Hastelloy N®, a nickel-based alloy, and 316 stainless steel are among the candidate structural materials being considered for the construction of the molten salt reactor (MSR). Most of the proposed MSR concepts use molten fluoride salts as coolant which can be quite corrosive to structural alloys. The results of studies on the corrosion behavior of the two alloys in molten Li2BeF4 (FLiBe) salt at 700°C are discussed.
This salt is being considered as the primary coolant for MSR designs featuring solid fuel particles, but the reported results also provide insights into the corrosion in MSR designs where the uranium fuel is dissolved in the molten fluoride salt. Corrosion was observed to occur predominantly by de-alloying of Cr from the alloy surface and into the molten salt, with more pronounced attack occurring along the grain boundaries than in the bulk grains.
The magnitude and the mechanisms of corrosion were different for corrosion tests performed in graphite and metallic capsules, a result warranting recognition given the coexistence of structural alloys and graphite in the molten salt medium in the MSR.
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DOI of Published Version
https://doi.org/10.1007/s11837-018-2981-2
