By using an electrochemical technique, the diffusivity in a foil sample of 5N-purity material was found to be equal to 2.3 x 10-9cm2/s at 23C. It was noted that the diffusivity was affected by the purity of the material, and that surface properties were important in limiting permeation.
Electrochemical Determination of Hydrogen Transport through Copper. D.W.DeWulf, A.J.Bard: Journal of the Electrochemical Society, 1985, 132[12], 2965-7
Table 17
Parameters for H Diffusion in Cu Alloys at 800 to 1000K
Alloy | Do (cm2/s) | E (kcal/g-atom) |
Cu (commercially pure) | 2.29 x 10-2 | 11.3 |
Cu (oxidized and reduced) | 2.51 x 10-2 | 11.3 |
Cu-7Sn-0.2%P | 3.2 x 10-3 | 9.2 |