High temperature chloride corrosion behavior of AlFe2.5NiMoNbCr high-entropy alloy

High temperature chloride corrosion tests of AlFe2.5NiMoNbCr high-entropy alloy were carried out comparing with those of Inconel625 and AlFeNiMoNb plate. Uniform dispersion of elements in the Cr depletion zone existed during the corrosion process of AlFe2.5NiMoNbCr high-entropy alloy promoted the formation of continuous Al2O3 layer, and the dendritic Al2O3 improved the adhesion of the corrosion layer through “oxide pegging” mechanism. Observation of metal chloride oxides on the samples sealed for several days at R.T. supplemented the reaction of high temperature chlorine corrosion. Al2O3/Cr2O3 double-layer makes AlFe2.5NiMoNbCr have better potential application value than Inconel625 with a single Cr2O3 layer.