Corrosion Behavior of VM12-SHC Steel in Contact with Solar Salt and Ternary Molten Salt in Accelerated Fluid Conditions

  1. García-Martin, Gustavo
  2. Lasanta, María I.
  3. de Miguel, María T.
  4. Sánchez, Andre Illana
  5. Pérez-Trujillo, Francisco J.
Revista:
Energies

ISSN: 1996-1073

Año de publicación: 2021

Volumen: 14

Número: 18

Páginas: 5903

Tipo: Artículo

DOI: 10.3390/EN14185903 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Energies

Resumen

Ternary low melting point mixtures with the addition of LiNO3 and Ca(NO3)2 have been presented as direct system candidates for CSP technologies due to having better physical and chemical properties than those of Solar Salt. In this study, thermal, physical and chemical properties are measured as is the corrosive behavior of stainless alloy VM12 (Cr 12%) when in contact with Solar Salt, 60% NaNO3-40% KNO3 (wt.%) and ternary 46% NaNO3-19% Ca(NO3)2-35% LiNO3 (wt.%). Gravimetric weight change measurements were performed on the test specimens, which were tested under accelerated fluid conditions (0.2 m s−1) at 500 °C for 2000 h. This research confirms the potential of this novel formulation as a thermal storage medium and validates the suitability of ferritic VM12-SHC stainless steel as a structural material for CSP technology with Solar Salt. Meanwhile, the results obtained by scanning electron microscopy and X-ray diffraction indicate a reduction in the protective character of the oxide layer formed on this alloy when the medium contains calcium and lithium components.

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