Study of cyclic hot corrosion of nanostructured Cr/Co-Al coatings on superalloy

▶ Hot corrosion behavior of magnetron sputtered nanostructured Cr/Co-Al coated superalloy has been investigated. ▶ The corrosion rate of Cr/Co-Al coated superalloy is lower than that of the uncoated superalloy due to the formation of protective oxide scale. ▶ The protective oxide scales as such as Cr2O3, Al2O3, and CoCr2O4 have formed over the Cr/Co-Al coated superalloy exposed to molten salt environment.