Pontificia Universidad Católica de Chile Pontificia Universidad Católica de Chile
Pineda F., Walczak M., Vilchez F., Guerra C., Escobar R., Sancy M. (2021)

Evolution of corrosion products on ASTM A36 and AISI 304L steels formed in exposure to molten NaNO3–KNO3 eutectic salt: Electrochemical study

Revista : Corrosion Science
Volumen : 196
Páginas : 110047
Tipo de publicación : ISI Ir a publicación


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 °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 Levie´s theory, whereas stainless steel showed the formation of a passive multilayer of iron and chromium oxides, which was adjusted to the Power-law model.