Advanced heat transfer fluids for direct molten salt line-focusing CSP plants

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.

Molten Salt Corrosion of Stainless Steels and Low-Cr Steel in CSP Plants

Corrosion of stainless steels and low-Cr steel in molten Ca(NO3)2–NaNO3–KNO3 eutectic salt for direct energy storage in CSP plants

Molten salt corrosion mechanisms of nitrate based thermal energy storage materials for concentrated solar power plants: A review

Reversible oxygen electrode systems in molten salts

Solubility and detection of water in the (Na,K)NO3 eutectic melt

On most electrocatalysts H202 is an intermediate in the electroreduction of oxygen. H202 can decompose either chemically or electrochemicall y and in assessing the performance of the electrocatalyst it is crucial to distinguish between these reaction paths. A simple method is proposed to determine whether or not the chemical path is followed.

G. Signorile

Papers

Solubility and detection of water in the (Na,K)NO3 eutectic melt

Hydrogen Peroxide as an Intermediate in Electrocatalytic Reduction of Oxygen. A New Method for the Determination of Rate Constants