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oai:docta.ucm.es:20.500.14352/1148822025-03-18T15:04:03Zcom_20.500.14352_14col_20.500.14352_15

Molten Salt Corrosion of Stainless Steels and Low-Cr Steel in CSP Plants Fernández, A. G. Lasanta Carrasco, María Isabel Pérez Trujillo, Francisco Javier The corrosive effects of 60 % NaNO3/40 % NaNO3 have been tested at 390 and 550 °C, in order to simulate the working conditions in two principal concentrated solar power (CSP) plants, on stainless steel (AISI 304, 430) and on a low-Cr alloy steel (T22) containing 2.25 % Cr. The corrosion rates were determined by gravimetric tests, measuring the weight gain during 2,000 h, identifying the corrosion products via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Thereby, Fe2O3 and Fe3O4 were the most prominent products formed from the tests performed at 390 °C, being observed also the formation of some stable compounds due to the impurities of the salt, as magnesium ferrite (MgFe2O4) and NaFeO2. The study at 550 °C of stainless steels revealed a better behavior under corrosive environments than T22 steel, identifying the formation of FeCr2O4 protective spinels mainly. To complete the corrosion tests, thermo-physical studies were carried out in binary mixture, using DSC and TGA. Also the most important parameters of the salt before and after corrosion test were tested. 2025-01-17T11:25:02Z 2025-01-17T11:25:02Z 2012-08-08 journal article Fernández, A.G., Lasanta, M.I. & Pérez, F.J. Molten Salt Corrosion of Stainless Steels and Low-Cr Steel in CSP Plants. Oxid Met 78, 329–348 (2012). https://doi.org/10.1007/s11085-012-9310-x 0030-770X 1573-4889 10.1007/s11085-012-9310-x https://hdl.handle.net/20.500.14352/114882 https://doi.org/10.1007/s11085-012-9310-x https://link.springer.com/article/10.1007/s11085-012-9310-x eng http://creativecommons.org/licenses/by-nc-nd/4.0/ restricted access Attribution-NonCommercial-NoDerivatives 4.0 International Springer