Zirconia-based coatings for the protection of ferritic-martensitic steels in a molten salt environment for CSP technology

Abstract The ferritic-martensitic 9Cr-1Mo steel was coated with a sol-gel ZrO2-3%molY2O3 solution by dip-coating. protective properties of the coating were evaluated in contact Solar Salt for CSP applications. and uncoated steels tested at 500 °C 2000 h. Gravimetric, microstructural compositional studies performed to compare their behaviour, against corrosion. Results revealed beneficial influence on corrosion resistance P91 molten nitrate salt. Weight gain samples remained practically unaltered throughout test, while showed weight increase formation multi-layered, non-adherent layers that spalled during test. study shows maintenance layer presence 5.18 μm-thick diffusion primarily composed Fe-Zr species, which reduce ionic improve properties. reveal possible suitability proposed system as potential severe problems industrial tanks pipes Salt. Graphical