Abstract
AbstractThe purification of salt is indispensable for mitigating the corrosion of structural materials for molten salt reactors or other molten salt applications. This study develops a salt-purification system to synthesize and purify NaF-KF-UF4 salt (FUNaK) using Ar purging and hydrofluorination of impurities. Chronoamperometry is also used to remove metallic impurities in the hydrofluorinated FUNaK. This purified FUNaK is then used for a static corrosion test of stainless steel 316H (SS316H) to study the effectiveness of salt purification in mitigating its corrosion. For comparison, results from a previous study about the corrosion of SS316H by thermally purified FUNaK are used. FUNaK with UF3 is also synthesized for a static corrosion test with the same condition to investigate the impact of UF3 on corrosion. The results show that the corrosion of SS316H is significantly reduced by using the chemically purified FUNaK compared to thermally purified FUNaK.
Publisher
Springer Science and Business Media LLC
Reference36 articles.
1. Sridharan, K. & Allen, T. R. Corrosion in molten salts. In: Molten salts chemistry from lab to applications (eds. Lantelme, F. & Groult, H.) 241–267 (Elsevier Inc., 2013).
2. Shaffer, J. H. Preparation of MSRE fuel, coolant, and flush salts. In: Molten-salt reactor program semiannual progress report for period ending July 31, 1964 (ed. Briggs, R. B.) 288–303 (Oak Ridge National Laboratory, 1964).
3. Pizzini, S. & Morlotti, R. Oxygen and hydrogen electrodes in molten fluorides. Electrochim. Acta 10, 1033–1041 (1965).
4. Mathews, A. L. & Baes, C. F. J. Oxide chemistry and thermodynamics of molten LiF-BeF2 solutions. Inorg. Chem. 7, 373–382 (1968).
5. Sohal, M. S., Ebner, M. A., Sabharwall, P. & Sharpe, P. Engineering database of liquid salt thermophysical and thermochemical properties. (2010).