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Chemical and kinetic factors related to hydrogen removal from aluminum

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Abstract

The available data on hydrogen solubility in aluminum are reviewed. Then a mathematical analysis of the kinetics of hydrogen removal is presented. A rather complicated general equation for the hydrogen removal in batch reactors is shown to reduce to more simple expressions for certain values of anew dimensionless group, Ψ/[pct H]. This “dimensionless hydrogen concentration” can be understood to represent the ratio of the ability of hydrogen to diffuse to bubbles during their ascent divided by the capacity of the purge gas to remove hydrogen. When ψ/[pct H] ≼ 0.1, diffusion of hydrogen in the metal is rate controlling. When ψ/Ipct H] 3> 1.0, the purge gas concentration is essentially at equilibrium with the melt, and thermodynamic limitations apply. The mathematical analysis has been used, together with available data on the diffusion coefficient of hydrogen and on mass transfer coefficients, to describe the operation of industrial processes. Then a theoretical analysis of vacuum treatment is presented. The vacuum is seen to remove partially equilibrium limitations found at atmospheric pressure.

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Authors and Affiliations

  1. Cabot Research and Development, P.O. Box 1296, 19603, Reading, PA

    G. K. Sigworth (Senior Research Engineer)

  2. Division of Metallurgy, The Norwegian Institute of Technology, 7034, Trondheim-NTH, Norway

    T. A. Engh (Professor of Metallurgy)

Authors
  1. G. K. Sigworth
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  2. T. A. Engh
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G. K. SIGWORTH, formerly Visiting Scientist at The Norwegian Institute of Technology.

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Sigworth, G.K., Engh, T.A. Chemical and kinetic factors related to hydrogen removal from aluminum. Metall Trans B 13, 447–460 (1982). https://doi.org/10.1007/BF02667761

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