Abstract
The corrosion (dissolution) kinetics of solid molybdenum, niobium, chromium, and yttrium in molten aluminum were investigated at temperatures between 700 °C and 915 °C under hydrodynamic conditions using the rotating disc method. Dissolution was governed by diffusion under laminar flow conditions (in the angular velocity range of 10 to 32 rad/s) regardless of the number of intermetallic compound layers formed at the solid-liquid interface. The solubility limit (C S ), dissolutíon rate constant(K), and diffusion coefficient(D) were determined. It was found that temperature dependencies of the solubility, dissolution rate, and diffusion coefficient for each system obeyed Arrhenius-type relationships; from these, the activation energies were calculated. The single or multiphase intermetallic layer growth occurring at the solid-liquid interface during dissolution in an unsaturated melt between 700 °C and 915 °C was characterized.
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Tunca, N., Delamore, G.W. & Smith, R.W. Corrosion of Mo, Nb, Cr, and Y in molten aluminum. Metall Trans A 21, 2919–2928 (1990). https://doi.org/10.1007/BF02647212
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DOI: https://doi.org/10.1007/BF02647212