The migration of H in hardened material was studied electrochemically (constant current) at 283 to 343K. The permeation rate, effective diffusivity and solubility were deduced from the data. The diffusion data were described by:

D (cm2/s) = 1.80 x 10-1 exp[-33.9(kJ/mol)/RT]

C.H.Tseng, W.Y.Wei, J.K.Wu: Materials Science and Technology, 1989, 5[12], 1236-9