The diffusivity of H in the amorphous alloy was compared with that in the corresponding crystalline alloy by using electrochemical permeation techniques. The amorphous alloy was crystallized at 603 and 673K. These temperatures were below and above the critical temperature for crystallization. The decrease in diffusivity in samples which were aged at 673K for 16.2ks was greater than that in samples which were aged at 603K for 172.8ks. The precipitation of numerous micro-crystallites which appeared to contain supersaturated metalloids was observed in samples that were aged at 603K for 172.8ks, whereas the precipitation of a smaller number of large Ni crystallites was observed in samples that were aged at 673K for 16.2ks. The decrease in diffusivity of the aged alloys was explained in terms of differences in H trapping, due to differences in the structure after aging.

M.Hara, R.M.Latanision: Corrosion Science, 1995, 37[6], 865-75