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The ratios of layer thicknesses in a multiphase oxide scale

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Abstract

The diffusion controlled oxidation of a metal to produce two-layer oxides and one type of three-layer oxide is analyzed. It is proved that the relative thicknesses of the oxide layers must tend to a limiting constant value for all oxidizing conditions. The analysis for the three-layer oxide is applied to the oxidation of 9Cr steel in high pressure steam at 500°C. The proportion of hematite expected within the outer oxide layers produced in steam with oxygen partial pressures ≥10−20 bar is calculated to be very dependent on the metal oxidation rate and not on the oxygen partial pressure.

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Authors and Affiliations

  1. Technology Planning & Research Division, Central Electricity Generating Board, Central Electricity Research Laboratories, KT22 7SE, Leatherhead, Surrey, England

    P. L. Harrison

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  1. P. L. Harrison
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Harrison, P.L. The ratios of layer thicknesses in a multiphase oxide scale. Oxid Met 22, 35–43 (1984). https://doi.org/10.1007/BF00659247

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  • DOI: https://doi.org/10.1007/BF00659247

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