Abstract
AbstractIn this study, the Ni‐cladding layer was deposited on Inconel 617 substrate as a corrosion‐resistant layer by gas tungsten arc welding. The corrosion behavior of Inconel 617 alloys with and without Ni‐cladding layer, and individual Ni‐claddings was studied at 850°C in molten FLiNaK salts with a high Ni2+ concentration. After corrosion, FeNi3 layers cover the surface of all alloy specimens. Inconel 617 suffers from severe Cr depletion, whereas Ni‐claddings with low Cr content demonstrate significantly improved corrosion resistance. For Ni‐clad Inconel 617, if Ni‐claddings are broken, the coupling of Ni‐claddings and Inconel 617 can accelerate the corrosion of Inconel 617 by galvanic corrosion, inducing a mass transfer of Co from Inconel 617 to Ni‐claddings through the molten salts.
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