Zirconium Effect on the Corrosion Behavior of 316L Stainless Steel Alloy and Hastelloy-N Superalloy in Molten Fluoride Salt

Corrosion of 316H stainless steel in flowing FLiNaK salt

“…The 366 ppm of Zr in the salt is notable, and may have accounted for the low observed corrosion rate [36]. Cheng et al observed Zr deposition on stainless steel samples exposed to FLiNaK salt with Zr addition, [37] although the Zr concentration in the salt used for that work (1.9%) was much higher than in the salt used for the present work…”

Corrosion and Thermal Stability of CrMnFeNi High Entropy Alloy in Molten FLiBe Salt

“…These observations point to the possibility of using Mn/MnF 2 couple as a redox buffer to reduce the overall corrosion potential and to slow or stop the dissolution of Cr. Such technique, in principle, was employed in the MSR experiment in ORNL during the 1960s by adding metallic elements such as Mg, Zr, and Be to the salt 2,24–26 . However, in our case, the structural materials would provide a constant source of buffer to the salt.…”

Concentrating Solar Power Gen3 Demonstration Roadmap

“…Alternative active metals with a lower melting point, e.g., sodium, may be needed if Mg precipitates from solution under these conditions. In a related example, Zirconium metal was added to a molten fluoride salt, which caused the deposition of a pure Zr layer, followed by interdiffusion to form a Ni/Zr intermetallic phase that acted as a barrier to corrosion [28] [29]. Lastly, it is essential to know that the desired salt-chemistry conditions are being maintained in the melt, so a monitoring method is required.…”