A study was made of diffusion in various alloys at 0 to 80C by measuring the H potential at the surface of thin metal plates during the permeation tests. The results depended upon the H concentration in the metal, and could be described by:

D (cm2/s) = 4.5 x 10-3 exp[-5.8(kcal/g-atom)/RT]

G.Holleck, E.Wicke: Zeitschrift für Physikalische Chemie, 1967, 56[3-4], 155-72