Migration from the gas phase, and through zone-refined material, was measured by using electrochemical techniques at 0 to 60C and 0.01 to 1atm. Surface impedance problems were eliminated by using a thin layer of electroplated Pd on the input surface of the permeation membrane. The steady-state flux was proportional to the square root of the pressure and was inversely proportional to the membrane thickness. The results could be described by:

P (atomH/cm s atm½) = 2.6 x 1017 exp[-8.50(kcal/mol)/RT]

Steady State Hydrogen Transport through Zone Refined Irons. A.J.Kumnick, H.H.Johnson: Metallurgical Transactions A, 1975, 6[5], 1087-92