In liquid–fuel molten salt reactor designs, salt–facing materials will be exposed to a molten salt containing a multitude of fission products and other corrosive species. Currently, little work has been done to understand the unique corrosion characteristics of materials in liquid–fuel systems. In this study, we conducted corrosion experiments up to 150 h in duration which exposed four commercial alloys (Hastelloy N, Incoloy 800H, 316L stainless steel, and Ni–201) to 3 molten salt compositions in order to better understand corrosion in liquid–fuel systems and inform reactor design going forward. It was found that the presence of simulant fission product species in a highly corrosive FLiNaK + EuF₃ molten salt does not lead to any detectable increase in the extent of corrosion at reactor–relevant conditions. No penetration of simulant fission product species into the samples was detected. The unique corrosion morphology of each of the alloys tested in this work is discussed. In particular, Ni–201 was found to be an ideal salt–facing material in molten fluoride systems and is essentially immune to corrosion.

在液体燃料熔融盐反应堆设计中，面向盐的材料将暴露于含有多种裂变产物和其他腐蚀性物质的熔融盐中。目前，几乎没有做任何工作来了解液体燃料系统中材料的独特腐蚀特性。在这项研究中，我们进行了长达150小时的腐蚀实验，将4种商用合金（Hastelloy N，Incoloy 800H，316L不锈钢和Ni–201）暴露于3种熔融盐成分中，以便更好地了解液体燃料中的腐蚀系统并告知反应堆设计的未来。发现在高度腐蚀的FLiNaK + EuF _3中存在模拟裂变产物种类在与反应堆有关的条件下，熔融盐不会导致腐蚀程度的任何可检测到的增加。没有检测到模拟裂变产物种类渗透到样品中。讨论了这项工作中测试的每种合金的独特腐蚀形态。尤其是，发现Ni–201是熔融氟化物系统中理想的盐类材料，并且基本上不受腐蚀。