A study was made of the diffusion of H by using a Sieverts cell at a H partial pressure of 1atm. The results, for temperatures ranging from 1090 to 1416C (table 13) could be described by:

D (cm2/s) = 2.49 x 10-3 exp[-6.23(kcal/g-atom)/RT]

H.Schenck, K.W.Lange: Archiv für Eisenhüttenwesen, 1966, 37[10], 809-12

Table 13

Diffusivity of H in Co