It was shown that permeation through the walls of Pd-5.9wt%Ni alloy tubes, under a gradient-less pressure of H, was directly proportional to the difference between the square roots of the partial pressures of H at the entrance and at exit of the tube. The data, for temperatures of 113 to 306C, could be described by:

P (cm mm/s atm½) = 0.2 exp[-6.0(kcal/mol)/RT]

L.F.Pavlova, V.M.Gryaznov, V.B.Khlebnikov, N.K.Borovkova: Doklady Akademii Nauk, 1972, 207[4], 919-22

Table 152

Parameters for H Diffusion in Pd-Rh