Abstract

Abstract Liquid sodium is used in new energy conversion systems such as fast breeder reactors and sodium-sulfur batteries. Liquid sodium forms high-temperature molten salts once it is exposed to air by reactions with oxygen or moisture. These molten salts might cause the severe corrosion of metals. In this study, the high-temperature corrosion of iron was studied in the presence of sodium salt using thermogravimetry in an air-simulated atmosphere. The corrosion reaction with coexisting NaOH obeyed a parabolic rate law. On the other hand, severe corrosion occurred with coexisting Na2O2. The corrosion reaction changed from a parabolic rate law to a linear rate law as the amount of melt increased, because the dissolution on the corrosion of the corrosion layer would increase with the amount of melt. Since the oxidation ability of Na2O2 is not as high as that of O2, dissolution of an oxide scale on iron would be the main reason for severe corrosion.

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