Data on the permeation of electrolytic H showed that the diffusivity appeared to depend upon the applied current; perhaps because of a dependence upon the bulk concentration (10-6g-atom/cm3) of H in the metal. At a cathodic current of 10mA/cm2, the diffusivity ranged from 1.16 x 10-7 to 1.22 x 10-7cm2/s. The equivalent values for cathodic currents of 25 and 50mA/cm2 ranged from 2.78 x 10-7 to 2.87 x 10-7 and from 8.72 x 10-7 to 6.82 x 10-7cm2/s, respectively.

The Permeation of Electrolytic Hydrogen through Lead. I.Cadersky, B.L.Muju, F.R.Smith: Canadian Journal of Chemistry, 1970, 48[11], 1789-91