The permeability was measured by using an A-99 hollow cylinder of variable cross-section. The H flow was measured by using an Omegatron apparatus with a sensitivity of 2 x 10-8cm3/s. The H permeability was described by:

P (cm2/s atm½) = 0.13 exp[-25000/RT]

The effective activation energy was lower than the sum of the diffusion activation energy and the heat of H dissolution in Al.

A.F.Vyatkin, L.A.Andreev, V.A.Danilkin: Izvestiya Vysshikh Uchebnykh Zavedenii (Chern. Met.), 1975, 3, 23-6