Large-grained (4mm) specimens of 4N5-purity material were charged with high-purity H by heating (600C, 48h). The diffusion coefficients were deduced from desorption measurements. The diffusivity at temperatures of between 450 and 625C (table 3) could be described by:
D (m2/s) = 1.01 x 10-5 exp[-47.7(kJ/mol)/RT]
Diffusion of Hydrogen in Pure Large Grain Aluminum. R.A.Outlaw, D.T.Peterson, F.A.Schmidt: Scripta Metallurgica, 1982, 16[3], 287-92
Table 3
Diffusivity of H in Al
Temperature (C) | D (m2/s) |
625 | 1.52 x 10-8 |
600 | 1.26 x 10-8 |
575 | 1.03 x 10-8 |
550 | 8.38 x 10-9 |
525 | 6.72 x 10-9 |
500 | 5.30 x 10-9 |
475 | 4.12 x 10-9 |
450 | 3.14 x 10-9 |