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The diffusion of hydrogen in liquid iron alloys

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Abstract

Rates of absorption of hydrogen in stagnant liquid iron and ten (Fe-X) binary iron alloy systems were studied by an unsteady-state gas-liquid metal diffusion cell technique. These rates were found to be controlled by diffusion of hydrogen in the liquid phase. Chemical diffusion coefficients (D h) were measured in pure iron and Fe-X alloys in the following (at. pct) composition ranges: Mn (0 to 5), Cr (0 to 25), V (0 to 25), Nb (0 to 10), Mo (0 to 25), W (0 to 5), Ni (0 to 75), Co (0 to 75), Sn (0 to 10), and Cu (0 to 25). All measuredD H values at 1600°C lie between 7 × 10-4 and 16 × 10-4 sq cm per sec. The diffusion coefficients found for pure iron can be represented by DH Fe = 4.37 × 10−3 exp (−4134 ± 1012)/RT cm2/sec where the uncertainty in the activation energy, Q, in cal per mole, corresponds to the 90 pct confidence level. A linear relationship was found between the logarithm of the hydrogen diffusion coefficient DH Fe-X and the interaction parameter εH X for low and medium concentrations of alloying elementX, when applied to a fixed concentration ofX(5 or 25 at. pct) and to individual periods in the periodic table. A useful linear correlation also appears to exist between logDH Fe-X and hydrogen solubility for fixed concentration ofX and with respect to the period in whichX is found.

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Authors and Affiliations

  1. Ideal Standard Europe, Ltd., Brussels, Belgium

    P. J. Depuydt (Metallurgical Engineer)

  2. Department of Mineral Engineering, Stanford University, USA

    N. A. D. Parlee (Professor of Extractive Metallurgy)

Authors
  1. P. J. Depuydt
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  2. N. A. D. Parlee
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Additional information

Formerly Research Assistant, Department of Mineral Engineering, Stanford University, Stanford, Calif.

This paper is based upon a thesis submitted by P. J. DEPUYDT in partial fulfillment of the requirements of the degree of Doctor of Philosophy at Stanford University and part of a presentation made at the 1970 Annual AIME Meeting.

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Depuydt, P.J., Parlee, N.A.D. The diffusion of hydrogen in liquid iron alloys. Metall Trans 3, 529–536 (1972). https://doi.org/10.1007/BF02642058

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