The corrosion of structural materials is a great challenge for the development of a molten salt reactor
using molten fluorides as fuel or coolant. The corrosion of materials in molten fluorides occurs mainly
through the dissolution of alloying elements into the melt. In the present investigation, the galvanic
corrosion behavior of pure Ni, Fe, and Cr as the common alloying constituents in an eutectic LiF–NaF–KF
melt at 700 8C has been investigated. The experimental results indicate that the corrosion potential of the
three metals decreases significantly by the order of Ni, Fe and Cr, with the largest potential difference
observed between Ni and Cr. Their great potential differences lead to the occurrence of significant
galvanic corrosion. The galvanic corrosion effects of the couples Ni/Cr, Ni/Fe and Fe/Cr are significantly
larger than 1, with the most remarkable effectiveness obtained for the couple Ni/Cr, then Fe/Cr and Ni/Fe.
The corrosion of structural materials is a great challenge for the development of a molten salt reactorusing molten fluorides as fuel or coolant. The corrosion of materials in molten fluorides occurs mainlythrough the dissolution of alloying elements into the melt. In the present investigation, the galvaniccorrosion behavior of pure Ni, Fe, and Cr as the common alloying constituents in an eutectic LiF–NaF–KFmelt at 700 8C has been investigated. The experimental results indicate that the corrosion potential of thethree metals decreases significantly by the order of Ni, Fe and Cr, with the largest potential differenceobserved between Ni and Cr. Their great potential differences lead to the occurrence of significantgalvanic corrosion. The galvanic corrosion effects of the couples Ni/Cr, Ni/Fe and Fe/Cr are significantlylarger than 1, with the most remarkable effectiveness obtained for the couple Ni/Cr, then Fe/Cr and Ni/Fe.
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