Evolution of corrosion products on ASTM A36 and AISI 304L steels formed in exposure to molten NaNO<sub>3</sub>-KNO<sub>3</sub> eutectic salt: Electrochemical study
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Date
2022
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Abstract
Thermal energy storage uses molten salt as a heat transfer fluid implies a high corrosion risk. In this work, ASTM A36 and AISI 304L steel, exposed to solar salt at 390 degrees C for 21 days, were studied by electrochemical impedance spectroscopy. The results were validated by mass gain and the characterization of corrosion products. Carbon steel revealed a porous behavior related to the formation of corrosion products based on iron oxides, as described the De Levies theory, whereas stainless steel showed the formation of a passive multilayer of iron and chromium oxides, which was adjusted to the Power-law model.
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Keywords
Concentrated solar power, Thermal energy storage, Electrochemical impedance spectroscopy, Solar salt, High-temperature corrosion, Steel