A study was made of the chemical diffusion of H by immersing an alumina tube, which contained H gas at 1atm, in a bath of stagnant liquid Fe and then measuring the volume of H which was absorbed by the Fe as a function of time. The materials used were zone-refined Fe and vacuum-degassed electrolytic Fe. Over the temperature range of 1547 to 1726C, the results could be described by:

D (cm2/s) = 3.2 x 10-3 exp[-3.3(kcal/mol)/RT]

When the O content of the melt was increased to above 0.015%, the apparent rate of H absorption was increased.

N.M.El-Tayeb, N.A.D.Parlee: Transactions of the Metallurgical Society of AIME, 1967, 239[9], 1345-51