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Transition from internal to external oxidation for binary alloys in the presence of an outer scale

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Abstract

The critical concentration required for the transition from internal to external oxidation of the most reactive component B of a binary A-B alloy for the case of simultaneous formation of an outer AO scale is calculated by extending Wagner's original analysis, which excluded the presence of an AO oxide. It is shown that the formation of an outer AO scale tends to produce an increase in the critical concentration of B, essentially as a result of a decrease of the enrichment of B in the internal oxidized region. Examples of the calculation of some parameters are presented to examine the effect of the different factors on the properties of internal oxidation and on its transition to the formation of an external scale of the oxide of the less noble component.

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Authors and Affiliations

  1. Istituto di Chimica Fisica Applicata dei Materiali del C.N.R., Lungobisagno Istria 34, 16141, Genova, Italy

    F. Gesmundo

  2. Istituto di Chimica, Facoltà di Ingegneria, Università di Genova, Fiera del Mare, Pad. D, 16129, Genova, Italy

    F. Viani

Authors
  1. F. Gesmundo
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  2. F. Viani
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Gesmundo, F., Viani, F. Transition from internal to external oxidation for binary alloys in the presence of an outer scale. Oxid Met 25, 269–282 (1986). https://doi.org/10.1007/BF01072908

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  • DOI: https://doi.org/10.1007/BF01072908

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