Speciation study of chromium corrosion product in molten LiF-NaF-KF salt

To investigate the corrosion products of Cr in molten FLi Na K salt（46.5 mol% Li F–11.5 mol% Na F–42mol% KF）, the corrosion test of the pure metal Cr was performed in molten FLi Na K salt at 700？C for 200 h.The FLi Na K salt after the corrosion test was thoroughly investigated by X-ray absorption near-edge structure spectroscopy, a transmission electron microscope, and X-ray diffraction. The results demonstrate that the predominant oxidation state of Cr in FLi Na K salt is Cr~（3＋）, and the main corrosion product in cooled FLi Na K salt is K_2NaCrF_6.