The absorption of H in stagnant pure Fe melts was studied by using an unsteady-state gas-liquid metal diffusion cell. This yielded the H diffusivity in liquid Fe at temperatures ranging from 1575 to 1675C. The results could be described by:

D (cm2/s) = 4.37 x 10-3 exp[-4.134(kcal/mol)/RT]

At 1600C, additions of 0 to 25at% of Mn, Cr, V, Nb, Mo, W or Ni decreased the diffusivity, whereas Co and Sn appreciably increased the diffusivity and Cu had no effect. All of the diffusivities lay between 7 x 10-4 and 1.6 x 10-3cm2/s at 1600C. The addition of up to 75%Ni increased the activation energy to 9.75kcal/mol.

P.J.Depuydt, N.A.D.Parlee: 99th AIME Annual Meeting (Denver, 1970)