The migration of H was studied at 260 to 1000K by using electrochemical and gas permeation techniques. It was found that the diffusion of H could be described by:

D (cm2/s) = 9.0 x 10-3 exp[-10.4(kcal/mol)/RT]

The results for alloys with Ni could also be described by straight Arrhenius lines. The activation energy for H diffusion was greatest for 30at%Ni alloys.

H.Hagi: Transactions of the Japan Institute of Metals, 1986, 27[4], 233-40