Fig. 4: Dealloying mechanism in molten salt.
a and b Four steps involved in molten salt dealloying of Cr from Ni–20Cr. a Interface-controlled processes: Ni surface diffusion, Cr reaction/dissolution, b Long-range diffusion-controlled processes: oxidants diffusion and Cr ion diffusion through the tortuous porous structure. c and d The power-law fitting ln ~ t of the dealloying distance (ln, n = 1, 2) vs. time (t) with the goodness of fit. The schematic inset in c showed the circle fitting method to determine l using the virtual XY plane images from the in situ X-ray nano-tomography experiment. The error bars in c are defined as the standard deviation in calculating l from different pseudo cross-sections. Note that the error bars in d are included but they are not visible due to the scale (for the complete data, see Supplementary Table 1).
