Corrosion Behavior of Materials for Prospective Use in Molten Salt Reactors

Abstract Molten salt reactors (MSRs) represent a promising Generation IV technology for safe and efficient nuclear power generation. The effective operation of MSRs depends on the durability and reliability of structural materials capable of enduring high temperatures, irradiation and a corrosive environment. This work investigates the corrosion behavior of nickel 201 and alloys as Inconel 600 and stainless steel when exposed to molten sodium hydroxide (NaOH) at 600 ºC, simulating the corrosive conditions of a potential MSR moderator environment. Electrochemical techniques were used to provide in situ information of the corrosion behavior of metal alloys exposed to molten salt. SEM/EDS and XRD were used to characterize the oxide formation and degradation mechanisms post exposure. The effects of corrosion mitigation techniques as using a protective blanketing gas or providing cathodic protection mitigation were explored. The findings provide essential information for designing and implementing durable and reliable molten salt reactors, advancing the development of sustainable, safe and efficient energy solutions.