The time-dependence of permeation through duplex membranes was studied by using pressures of between 1 and 100kPa, and temperatures of between 500 and 1000K. In the case of Cu/Ni membranes, the injection and evolution transient were not greatly affected by surface effects and the permeation behavior was accurately predicted by theory. In the case of Cu/Fe membranes, the steady-state permeation rate also agreed well with theory, but the time-transient appeared to be affected by surface oxide films or by bulk trapping effects. Permeation and diffusion parameters were deduced from the results (tables 19 and 20).

Hydrogen Diffusion and Permeation through Duplex Membrane of Cu-Ni and Cu-Fe. T.Tanabe, K.Sawada, S.Imoto: Transactions of the Japan Institute of Metals, 1986, 27[5], 321-7

Table 20

Parameters for H Permeation in Cu, Fe and Ni