Theoretical Analysis of Corrosion by Liquid Sodium and Sodium-Potassium Alloys

Models of liquid metal corrosion

“…Most of the studies agree with each other, while some studies result in contradict conclusions. Epstein [3] concluded that the corrosion by liquid sodium and sodium-potassium was more closely to activation control than to mass transfer based on comparisons between his model results and experimental data available, while by applying the kinetic model to analyze the same experimental data, Zhang et al [4] believed that the corrosion is in the mass transfer control range. It is difficult to determine which calculation is better because both of the models need exactly operating conditions of the experiments which were not given in the original reference.…”

“…(150) indicates that the iron solubility in sodium increases with the dissolved oxygen concentration. There is an upper limit of iron solubility which is thought to be the iron solution in liquid sodium saturated with oxygen [4]:…”

“…However, such ideal case does not occur in a practical system because the diffusion in the solid phase is always the slowest process. Since different constituents have different diffusion coefficients in the steel, a selective corrosion layer can be formed due to selective corrosion if the diffusion rate in the steel is not very low compared with the dissolution rate at interface [4].…”

Model calculation of Cr dissolution behavior of ODS ferritic steel in high-temperature flowing sodium environment

“…It has been reported that, when steels are used in high-temperature sodium, the solubility of steel constituent elements is increased in sodium [13], thus enhancing mass transfer phenomena such as dissolution, deposition and diffusion penetration of the solute elements [14][15][16][17][18][19][20]. Some studies have experimentally evaluated the mass transfer behavior of ODS steels in high-temperature sodium, e.g.…”

OSCAR-Na: A New Code for Simulating Corrosion Product Contamination in SFR

“…Unlike in PSYCHE, no downstream factor [3,5] is taken into account in this first version of OSCAR-Na. It is considered that the downstream effect (lower corrosion rate at the downstream positions of isothermal sections) can be reproduced by the code, as Fe concentration build up in Na can induce a saturation effect [7]. If it should not be confirmed by qualification of the code on loop experiments, some additional physics should be implemented in the code (role of particles etc.…”