An investigation was made of room-temperature H release, into vacuum, from electrolytic deposits which had been prepared under various conditions. Diffusivities (table 13) were deduced from the H desorption curves. The total amounts of mobile H which were given off at room temperature, and the total H which was given off at 800C under vacuum, were also determined. The results indicated that the H diffusivity, as well as the amounts of mobile and total H in electrolytic Fe, were strongly dependent upon the electrolysis conditions.

J.N.Petrov, E.A.Mamontov, V.V.Karyakin: Fiziko-Khimicheskaya Mekhanika Materialov, 1967, 3[3], 362-4

 

Table 13

Diffusivity of H at 20-22C after Electrolysis of Fe in Vacuum at 20 to 50C

 

T (C)

Current (A/dm2)

D (cm2/s)

Total H2 (mg/l)

Mobile H (%)

20

10

2.19 x 10-8

15.00

20

50

10

4.80 x 10-9

11.43

2.5

50

15

1.45 x 10-8

13.6

0.97

50

15

2.96 x 10-8

7.29

4.59

 

 

Table 14

Diffusivity of H in Fe at 20C as a Function of Tensile Deformation

 

Deformation (%)

D (cm2/s)

Trap Density (/cm3)

Dislocation Density (/cm2)

5

7.5 x 10-5

8.0 x 1017

2.7 x 109

10

6.9 x 10-5

1.7 x 1018

5.4 x 109

15

6.2 x 10-5

2.8 x 1018

8.1 x 109

20

5.6 x 10-5

4.2 x 1018

1.06 x 1010