An ultra-high vacuum apparatus was developed for the measurement of H permeation through metal membranes. The H permeation was measured for pressures ranging from 0.1 to 100mbar, and temperatures ranging from 50 to 440C. The results showed that the permeation was highly affected by surface contamination. The contaminants were removed from the surface by short-term aging at 200 to 300C in air. After cleaning the surface, the permeation increased and agreed well with previously published data. The activation enthalpy for permeation was equal to 0.144eV.

Hydrogen Permeability Measurements of Pd, Ni and Fe Membranes. K.Yamakawa, M.Ege, B.Ludescher, M.Hirscher, H.Kronmuller: Journal of Alloys and Compounds, 2001, 321[1], 17-23