Hydrogen gas permeation through amorphous and partially crystallized Fe40Ni38Mo4B18

Abstract

gas permeation from 523 to 643 K. The hydrogen permeation curves exhibited a single sigmoidal shape, typical of tests where no hydride formation occurs. It was observed that the hydrogen diffusivity increases for the amorphous samples and partially crystallized alloy with the temperature increase. The hydrogen diffusion coefficient as a function of temperature was found to be D = 5.1 ± 0.5 × 10 -12 exp (-11.0 ± 3.5/RT) (m ) for the partially crystallized condition. This suggests that the annihilation of defects in the amorphous structure and the crystalline phase precipitate contributes to the increase of the hydrogen diffusion.

Electroless Amorphous NiP Coatings Over API X70 Steel: Resistance to Wear and Hydrogen Embrittlement

“…In addition to the metallic and ceramic coating described above, Ni and P-based amorphous ribbons having a composition of Ni 81 P 19 have been reported to display five orders of magnitude slower H-diffusivity than low-C steels [13,14], and hence are suitable candidates for H-barrier applications. Fe and Ni-based amorphous ribbons having slower H-diffusivity have also been reported in literature [13][14][15][16][17][18]. However, in all these reports H-diffusivity has been measured through amorphous ribbons using Devanathan-Stachursky electrochemical H-permeation cell [19].…”