Manometric measurements were used to study the permeation of H through medium alloy steel, with and without the addition of 0.5wt%Pd. Measurements were also made of H solubility, and this permitted the calculation of diffusion coefficients (table 77).

V.I.Arkharov, T.T.Moroz, I.A.Novokhatskii, M.I.Eremina, S.I.Khokhlova: Fiziko-Khimicheskaya Mekhanika Materialov, 1971, 7[6], 51-4

 

Table 78

Apparent Room-Temperature Diffusivity of H in Irradiated HY-80 Steel

 

Specimen

H Surface Concentration (ppm)

D (cm2/s)

non-irradiated

7.5

6 x 10-6

non-irradiated

9.6

6.4 x 10-6

non-irradiated

10.2

8.3 x 10-6

irradiateda

13.25

4.4 x 10-6

irradiateda

11.5

1.33 x 10-6

irradiateda

13.0

2.2 x 10-6

a: dose = 4 x 1017n/cm2, energy >1MeV