日本金属学会誌

J. Japan Inst. Metals, Vol. 28, No. 2 (1964),
pp. 59-64

The Solubility of Hydrogen in Liquid Pure Iron

Kôki Gunji1, Sachio Matoba2 and Kiyoo Ono1

1National Research Institute of Metals, Tokyo
2Central Research Laboratory, Fuji Iron & Steel, Co., Sagamihara

Abstract:

Data on the solubility of hydrogen in liquid metals are of practical interest. The solubility of hydrogen in liquid pure iron was measured with the ordinary hot-volume method. The following problems regarding the hot-volume method were examined: Selection of the melting crucible; selection of the standard gas for determination of the hot volumes of the apparatus; effects of the shapes, the magnitude of the dead spaces and the cooling methods of the melting chamber on the solubility of hydrogen.
The results obtained were as follows:
(1) Among alumina-, magnesia-, beryllia- and thoria-crucible, thoria crucible was the only melting crucible which could be used in the hot-volume method.
(2) Helium and argon were used for the standard gas. But according to the difference in the thermal properties between the gases, different experimental solubility values were obtained.
(3) Among the experimental solubility values, the most reliable value was obtained by using helium whose thermal properties are most akin to hydrogen and at the same time by using a completely water cooled reaction tube whose inner volume was reduced to an extreme.
(4) The solubility of hydrogen in liquid pure iron and the standard free energy change in dissolving of 1 wt%H were expressed as a function of temperature as follows:

1/2H2(gas) = H(dissolved in liquid iron)
Log,K(wt%) = -1700/T(°K)-1.694
Δ F° = 7790 + 7.751T
{\!
PH2 = 1 atm.
fHH = 1
\right.


(Received 1963/7/13)

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