Cu: H Diffusion and Permeation

By using mass spectroscopy, the H permeability of Cu at 760C was found to be equal to 4.8 x 10-8cm2/s atm½, while the diffusivity was equal to 6.3 x 10-6cm2/s.

J.I.Zvezdin, J.I.Belyakov: Fiziko-Khimicheskaya Mekhanika Materialov, 1967, 3[3], 349-51

Table 18

Parameters for H Permeation in Cu Alloys at 800 to 1000K

Alloy	Po (cm2/s atm½)	E (kcal/g-atom)
Cu (commercially pure)	0.119	20.0
Cu (oxidized and reduced)	0.134	20.0
Cu-7Sn-0.2%P	0.011	16.7
Cu-3Si-1%Mn	0.009	18.8
Cu-2%Be	0.021	18.8
Cu-9Al-4%Fe	0.001	20.1
Cu-1.5%Si	0.029	18.3
Cu-3.0%Si	0.011	18.3