Corrosion Study of Ni-based Alloy in Ternary Chloride Salt for Thermal Storage Application
Corrosion science(2022)
Abstract
MgCl2/NaCl/KCl salt appeared as a high-potential heat transfer fluid for concentrated solar application, offering a wide operating range and low cost. Nevertheless, MgCl2 hydrates and atmosphere relative humidity are the limiting factors for a real scale CSP plant, leading to severe corrosion. Thus, Inconel 617 was tested at 700 degrees C up to 24 h in air atmosphere to simulate a punctual failure in the inertization system of a plant. XRD and SEM-EDX analysis showed unstable multilayers growing in cascade, highlighting chromium, aluminum, magnesium, and oxygen activities. Additionally, A radial growth of MgCr2O4 at the expense of MgO grains was visualized.
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Key words
Molten chlorides corrosion,Thermodynamic simulations,Concentrated solar power,Thermal storage
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