Abstract
The effect of Graphite on the corrosion of Type 316L stainless steel (SS) was investigated in molten FLiNaK (LiF-NaF-KF: 46.5−11.5−42 mol.%) salt using electrochemical methods. Results show that Type 316L SS and Graphite, when ohmically-coupled, are susceptible to galvanic corrosion in molten fluoride salts. The Graphite, with the more positive electromotive potential, acts as the cathode in the Type 316L SS/Graphite galvanic couple and accelerates the corrosion of the steel. The galvanic effect of Graphite on Type 316L SS in molten FLiNaK salt increase linearly with increasing Graphite/Type 316L SS surface area ratio, temperature, and moisture impurities of the salt.
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