The diffusivity of H in fully annealed specimens was measured, by using an electrochemical permeation method, at 283 to 313K. The diffusion data for H in pure material was described by:

D (cm2/s) = 7.39 x 10-4 exp[-1.2(kcal/mol)/RT]

H.Hagi: Materials Transactions, 1992, 33[5], 472-9