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

Author

Listed:
  • Gustavo García-Martin

    (Surface Engineering and Nanostructured Materials Research Group, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Avenue s/n, 28040 Madrid, Spain)

  • María I. Lasanta

    (Surface Engineering and Nanostructured Materials Research Group, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Avenue s/n, 28040 Madrid, Spain)

  • María T. de Miguel

    (Surface Engineering and Nanostructured Materials Research Group, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Avenue s/n, 28040 Madrid, Spain)

  • Andre Illana Sánchez

    (Surface Engineering and Nanostructured Materials Research Group, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Avenue s/n, 28040 Madrid, Spain)

  • Francisco J. Pérez-Trujillo

    (Surface Engineering and Nanostructured Materials Research Group, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Avenue s/n, 28040 Madrid, Spain)

Abstract

Ternary low melting point mixtures with the addition of LiNO 3 and Ca(NO 3 ) 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% NaNO 3 -40% KNO 3 (wt.%) and ternary 46% NaNO 3 -19% Ca(NO 3 ) 2 -35% LiNO 3 (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.

Suggested Citation

  • Gustavo García-Martin & María I. Lasanta & María T. de Miguel & Andre Illana Sánchez & Francisco J. Pérez-Trujillo, 2021. "Corrosion Behavior of VM12-SHC Steel in Contact with Solar Salt and Ternary Molten Salt in Accelerated Fluid Conditions," Energies, MDPI, vol. 14(18), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5903-:d:637668
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    References listed on IDEAS

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