An investigation was made of the transport of cathodically generated H through the ferrite in an annealed mild steel (0.1wt%C) at various temperatures (figure 16). The lattice parameters of cathodically saturated ferrite in an annealed mild steel were also measured at room and liquid N temperatures.

K.J.L.Iyer: Scandinavian Journal of Metallurgy, 1987, 16[5], 205-9

Figure 16

Diffusivity of H in Annealed 0.1%C Steel