Electrolytic methods, involving a viscous electrolyte, were used to measure the diffusivity of H at temperatures of between 285 and 328K. The results (table 19) indicated that H diffused via a single-stage process at temperatures of between 285K and the melting point. No departures from Arrhenius behavior, due to trapping effects involving lattice vacancies, were found.

T.Ishikawa, R.B.McLellan: Acta Metallurgica, 1986, 34[6], 1091-5

 

Table 20

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