Long-term corrosion behaviors of Hastelloy-N and Hastelloy-B3 in moisture-containing molten FLiNaK salt environments

Improvement of Corrosion Resistance of Hastelloy-N Alloy in LiF-NaF-KF Molten Salt by Laser Cladding Pure Metallic Coatings

“…For the pure Co-coated specimens, the pre-corrosion specimen is mainly composed of γ-Co and a few Cr 2 O 3 ; while only γ-Co phase exists after corrosion. This is consistent with the conclusion that the metal oxides are thermodynamically unstable in the molten fluoride salt [4,[23][24][25][26]. For better understanding the formation and dissolution of the metal oxides, the possible chemical reactions and the corresponding Gibbs free energies are given in Table 3.…”

“…Ternary LiF-KF-NaF (FLiNaK, with molar ratio of 46.5:11.5:42.0) molten salt, one of the most promising candidate fluids for the high-temperature heat transfer, exhibits a series of advantages including high-temperature stability (>1000 • C), high thermal conductivity, high specific heat, high boiling point, and low viscosity [1][2][3][4]. FLiNaK molten salt can be used not only as a secondary coolant and a primary simulation coolant in molten salt reactors [5,6], but also as a primary coolant in advanced high-temperature reactors and heat transfer fluid in next-generation concentrated solar power systems [7].…”

Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

“…, Fe 2? ), could act as the principal driving force in the initial corrosion stage and significantly accelerate the materials corrosion [4][5][6][7].…”

Characterization of the Ni–Mo–Cr superalloy subjected to simulated heat-affected zone thermal cycle treatment

“…Note that the molten salt reactors (MSR) are the promising next generation nuclear reactors which will be able not only to produce electric powers, but also allow re-burning of fuels, deep burning, and nuclear transmutation of radioactive wastes [12,13]. Hastelloy N and similar Ni-based alloys are promising candidates for MSR structural materials [14]. No detectable oxidation was measured for Hastelloy N at temperature up to 649°C, and it shows promise for continuous operations at temperature up to 982°C [13].…”

“…No detectable oxidation was measured for Hastelloy N at temperature up to 649°C, and it shows promise for continuous operations at temperature up to 982°C [13]. In addition, someone [14] investigated long-term corrosion behaviors of Hastelloy N in moisture-containing molten salt environments at an ambient temperature of 700°C, and suggested its corrosion rates were relatively high at first 100 h but then decelerated rapidly at longer hours. For its composition, the Hastelloy N alloy contains 17 wt.% Mo for strengthening and 7 wt.% Cr for moderate oxidation resistance in molten fluoride salts.…”