A study was made of diffusion in various alloys 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 (tables 125 and 126).
G.Holleck, E.Wicke: Zeitschrift für Physikalische Chemie, 1967, 56[3-4], 155-72
Table 125
Parameters for H and D Diffusion in Pd Alloys at 0 to 80C
Alloy | Do (cm2/s) | E (kcal/g-atom) |
PdD0.335 | 8.0 x 10-3 | 5.7 |
Pd0.75Ag0.25D0.622 | 1.15 x 10-2 | 5.6 |
Pd0.95Sn0.05D0.528 | 6.0 x 10-3 | 5.7 |
PdH0.305 | 1.1 x 10-2 | 6.1 |
Pd0.75Ag0.25H0.612 | 1.7 x 10-2 | 7.1 |
Pd0.95Sn0.05H0.520 | 1.2 x 10-2 | 6.4 |
Pd0.95Pb0.05H0.494 | 1.15 x 10-2 | 6.4 |
Pd0.95Rh0.05H0.283 | 4.3 x 10-2 | 7.1 |
Pd0.9Rh0.05Ag0.05H0.346 | 3.1 x 10-2 | 7.1 |
Table 126
Parameters for H Diffusion in Pd Alloys at 0 to 80C
Alloy | Do (cm2/s) | E (kcal/g-atom) |
Pd | 4.5 x 10-3 | 5.8 |
Pd0.9Ag0.1 | 3.9 x 10-3 | 5.8 |
Pd0.75Ag0.25 | 3.3 x 10-3 | 5.8 |
Pd0.95Sn0.05 | 3.3 x 10-3 | 5.8 |