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1 2015

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Corrosion testing of nickel alloy for molten salt reactors

Slama P., Marecek M.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 70, nr 2

78--85

Purpose: The article deals with corrosion test conducted in LiF – BeF2 molten salt at 700°C using nitrogen as the inert atmosphere with the test durations of 1 and 3 months. Design/methodology/approach: The experiment was carried on nickel superalloy MoNiCr which was developed by COMTES FHT Inc. for application in molten salt reactors circuits. Corrosion testing was conducted in collaboration with Nuclear Research Institute Rez. Findings: The results show that chromium and molybdenum are preferentially released into the melt and the surface and grain boundaries become depleted of chromium. Rerearch implications: The assessment of corrosion damage suggests that in the LiF-BeF2 melt at 700°C, chromium and molybdenum are preferentially released into the melt and the surface and grain boundaries become depleted of chromium. Originality/value: The nickel alloys are determined for modern conceptions of nuclear reactors in which molten fluoride salts are used in the primary and/or secondary circuit as coolants. Particularly MONICR alloy represents a material alternative with high corrosion resistance in the area of fluoride salts and it has very good creep properties in the temperature range of 650-750°C as well.