Detection of hydrogen permeation on the microscopic scale in nickel

In situ observations of silver-decoration evolution under hydrogen permeation: Effects of grain boundary misorientation on hydrogen flux in pure iron

“…The most important parameter causing the redox reaction between hydrogen atoms and silver ions is the flux of hydrogen, not only the diffusion rate. The steady-state permeation flux is given in equation 2 [22]…”

Anisotropy of hydrogen diffusion in nickel single crystals: the effects of self-stress and hydrogen concentration on diffusion

“…In most cases, the influence of defects on diffusion was considered to be an indirect impact associated with trapping mechanisms 6 7 8 9 10 11 12 . However, defects can also act as high diffusivity paths because the mobility of solutes along such defects is usually much higher than in the lattice 13 14 15 16 17 18 19 . All these effects, (defects, concentration and stress) have a significant influence on the apparent diffusion coefficient in complex metallurgical structures (polycrystals, bicrystals, biphasic structures, precipitation hardening alloy, etc.).…”