The electrochemical permeation method, and galvanostatic charging conditions, were used to measure H diffusion in annealed or cold-worked samples. The diffusivity in the annealed material was independent of cathodic current densities ranging from 2.5 to 250A/m2. In cold-worked material, it was lower when the cathodic current density was lower. The temperature dependence of the diffusivity at 292 to 339K (at a cathodic current density of 10A/m2) could be described by:

D (cm2/s) = 3.69 x 10-3 exp[-8.8(kcal/mol)/RT]

Cold-rolled material exhibited a lower diffusivity and higher activation energy for diffusion.

Y.Sakamoto, K.Takao: Journal of the Japan Institute of Metals, 1982, 46[3], 285-90

The best linear fits to the solute diffusion data ([678] to [681], [693] to [703], [717] to [722], [725] to [727], [730] to [733], [736] to [739], [756] to [758]) yield:

Ag: Ln[Do] = 0.38E – 18 (R2 = 0.86); Cu: Ln[Do] = 0.44E – 22 (R2 = 0.77);

In: Ln[Do] = 0.50E – 22.8 (R2 = 0.99); O(l): Ln[Do] = 0.26E – 8.4 (R2 = 0.79);

Zn: Ln[Do] = 0.29E – 14.4 (R2 = 0.87)