SR X-ray analysis of Ni-based alloys corroded in molten fluoride salt

Corrosion test of Ni-based high temperature alloys of Inconel 600,Hastelloy X and Hastelloy c-276 were performed in molten fluoride salt(LiNaKF) at 750℃for up to 320 h.The virgin and corroded samples were imaged by scanning electron microscope,analyzed by synchrotron radiation microbeam X-ray fluorescence(μ-XRF) and characterized by X-ray diffraction(XRD).Theμ-XRF results show that corrosion of the Ni-based alloy in molten fluoride salt is mainly due to the erosion of alloying element Cr.The XRD results show that the alloying element Mo of Hastelloy c-276 formed the Mo_2C structure,which can enhances anti-corrosive performance of the alloy in molten fluoride salt.