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The Effect of Supersaturation on the Internal Oxidation of Binary Alloys

Authors
  • Gesmundo, F.
  • Castello, P.
  • Viani, F.
  • Roos, C.
Type
Published Article
Journal
Oxidation of Metals
Publisher
Kluwer Academic Publishers-Plenum Publishers
Publication Date
Apr 01, 1998
Volume
49
Issue
3-4
Pages
237–260
Identifiers
DOI: 10.1023/A:1018834525388
Source
Springer Nature
Keywords
License
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Abstract

According to the theory of Bohm and Kahlweit ofthe internal oxidation of binary A-B alloys, theparabolic rate constant for the formation of reasonablystable internal BOν oxides as well as theconcentrations of O and B at the oxidation front arecontrolled only by the degree of supersaturationnecessary for the nucleation of new oxide particles. Theeffects of this factor on the previous parameters arecalculated for various values of the solubility product ofthe oxide and of the diffusion coefficients of O and B.Moreover, an alternative procedure for the calculationof the critical degree of supersaturation behind the precipitation front required for oxideprecipitation, which is a function of the concentrationof the reactants at the internal oxidation front, isproposed. A simple modification of Wagner's theory of internal oxidation is also presented, andits results are compared with those of the treatment byBohm and Kahlweit. Finally, the limitations of the twomethods are examined.

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