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Corrosion Resistance at Temperature

Fluoride salts are fluxing agents that rapidly dissolve protective layers of oxides and other materials.

To avoid corrosion, molten salt coolants must be chosen that are thermodynamically stable relative to the materials of construction of the reactor; that is, the materials of construction are chemically noble relative to the salts.

This limits the choice to highly thermodynamically-stable salts.

This table shows the primary candidate fluorides suitable for a molten salt and their thermo-dynamic free energies of formation.

The general rule to ensure that the materials of construction are compatible (noble) with respect to the salt is that the difference in the Gibbs free energy of formation between the salt and the container material should be >20 kcal/(mole ºC).

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