Abstract
A previous model of duplex scale growth on 18/8 stainless steels based on the formation of an impervious barrier at hemispherical alloy grain boundaries has been extended to consider the influence of a finite healing layer growth rate. The analysis shows that true primary and secondary or healing layer parabolic rate constants can best be calculated from weight gain vs. the square root of time plots. Accurate determinations of the secondary rate constant requires oxidation exposures a factor of 3 or 4 times greater than the time to form a complete healing layer at the oxide-metal grain boundary interface. Good agreement is found between the present theory and expeimental data and the model gives a simple extrapolation method for the evaluation of long-term metal losses or oxide thicknesses.
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References
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Smith, A.F., Tucker, M.O. & Hales, R. The kinetics of duplex scale formation on 18/8 type stainless steel. Oxid Met 17, 329–343 (1982). https://doi.org/10.1007/BF00742115
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DOI: https://doi.org/10.1007/BF00742115