The diffusivity of H was determined as part of a study of H embrittlement. The results could be described by:
D (cm2/s) = 7.4 x 10-3 exp[-14.40(kcal/mol)/RT]
S.Nomura, M.Hasegawa: Transactions of the Iron and Steel Institute of Japan, 1980, 20[2], 215-22
Figure 20
Permeation of H in AISI 302
(open squares: H2 ambient, filled squares: H2/H2O ambient)
Table 97
Diffusivity of 60Co in AISI304
Temperature (C) | Ambient | Dbulk (cm2/s) | Dgb (cm2/s) |
280 | water | 6.0 x 10-19 | 1.4 x 10-21 |
300 | He | 2.3 x 10-19 | 3.1 x 10-21 |
600 | He | 1.4 x 10-17 | 7.9 x 10-17 |