首页|Corrosion behaviors of Ni-WC cemented carbide in high temperature molten fluoride salt and vapor
Corrosion behaviors of Ni-WC cemented carbide in high temperature molten fluoride salt and vapor
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NSTL
Elsevier
Ni-WC cemented carbides has a series of excellent properties, such as mechanical properties, thermal stability and wear resistance, but its corrosion resistance in molten fluoride salt is unknown. In this work, the corrosion behaviors of a Ni-WC cemented carbide (86.7W-8C-5Ni-0.3Cr wt.%) in molten FLiNaK salt (LiF-NaF-KF: 46.5-11.5-42 mol.%) and salt vapor were investigated by static immersion tests at 700 C. The microstructure and phase composition of the material after corrosion were characterized by scanning electron microscopy (SEM), electron probe micro-analysis (EPMA) and scanning transmission electron microscopy with energy dispersive spectrometry (STEM/EDS). The results show that in the liquid salt, Ni-rich particles are deposited on the material surface, and Cr from the binder of the specimens is dissolved. The oxidative impurities in the salt vapor induce the formation of flaky Cr2O3 on the material surface. The relatively little corrosion in both salt and vapor indicates that the application of this material in molten fluoride salts environment is promising. (c) 2022 Elsevier B.V. All rights reserved.
Ni-WCHigh temperature corrosionMolten saltSalt vaporMolten salt reactorMECHANICAL-PROPERTIESTUNGSTEN CARBIDESTAINLESS-STEELALLOYSCORESISTANCEHARDMETALS
NSTL
Elsevier
