Corrosion of structural materials in NaF-NaBF4 molten salt

MSRs are promising concepts of Generation IV. One of the challenges is the corrosion of construction materials. In this paper, corrosion tests of seven construction materials in molten NaF-NaBF4 at 550 °C or 700 °C with exposure of 720 h or 2160 h are presented. The molybdenum-nickel-based superalloys MoNiCr and HN80MTY achieved the best corrosion-resistance performance among the tested construction materials. Moreover, an increase in temperature led to a significant increase in corrosion mass losses per surface area; whereas, an increase in the duration of the exposure led to only a slight increase in corrosion mass losses per surface area.