Corrosion study of Ni-based alloy in ternary chloride salt for thermal storage application

MgCl2/NaCl/KCl salt appeared as a high-potential heat transfer fluid for concentrated solar application, offering wide operating range and low cost. Nevertheless, MgCl2 hydrates atmosphere relative humidity are the limiting factors real scale CSP plant, leading to severe corrosion. Thus, Inconel 617 was tested at 700ºC up 24 h in air simulate punctual failure inertization system of plant. XRD SEM-EDX analysis showed unstable multilayers growing cascade, highlighting chromium, aluminum, magnesium, oxygen activities. Additionally, A radial growth MgCr2O4 expense MgO grains visualized.