A study was made of the effect of an electric current upon the permeation of H through an Armco membrane (table 44). Two types of H transport were observed. One was transport through the crystal lattice, and the predominant route was along grain-boundaries. The activation energy for the former was greater than that for the latter. Electromigration was directed towards the cathode.

V.M.Sidorenko, R.I.Kripyakevich: Fiziko-Khimicheskaya Mekhanika Materialov, 1968, 4[3], 335-45

 

Table 44

Effective Charge and Permeation Rate of H through Fe,

as affected by an electric current

 

Temperature (C)

P (g-atom/cm s)

Z*(e)

600

15.1 x 10-10

8.3

650

20.0 x 10-10

7.6

700

24.8 x 10-10

6.66

750

30.0 x 10-10

4.24

800

35.6 x 10-10

3.98

850

42.8 x 10-10

4.06