Oxidation Mechanisms for Alloys in Single-Oxidant Gases

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Scales formed on alloys invariably contain the alloy constituents in a ratio different from that in the alloy, owing to the differing thermodynamic tendencies of the alloy components to react with the oxidant and to differences in diffusion rates in scale and alloy phases. This complex interrelationship between transport rates and the thermodynamics of the alloy-oxidant system can be analyzed using multicomponent diffusion theory when transport-controlled growth of single or multi-layered scales occurs. In particular, the superimposition of the diffusion data on an isothermal section of the appropriate phase diagram indicates the likely morphologies of the reaction products, including the ... continued below

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Pages: 45

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Whittle, D. P. March 1981.

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Scales formed on alloys invariably contain the alloy constituents in a ratio different from that in the alloy, owing to the differing thermodynamic tendencies of the alloy components to react with the oxidant and to differences in diffusion rates in scale and alloy phases. This complex interrelationship between transport rates and the thermodynamics of the alloy-oxidant system can be analyzed using multicomponent diffusion theory when transport-controlled growth of single or multi-layered scales occurs. In particular, the superimposition of the diffusion data on an isothermal section of the appropriate phase diagram indicates the likely morphologies of the reaction products, including the sequence of phases found in the scale, the occurrence of internal oxidation and the development of an irregular metal/scale interface. The scale morphologies on alloys are also time-dependent: there is an initial transient stage, a steady state period, and a final breakdown, the latter often related to mechanical influences such as scale adherence, spallation, thermal or mechanical stresses and void formation. Mechanical influences have a more devastating effect in alloy oxidation due to the changes in alloy surface composition during the steady state period.

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Pages: 45

Notes

NTIS, PC A03/MF A01.

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  • NACE international conference on high temperature corrosion, San Diego, CA, USA, 2 Mar 1981

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  • Report No.: LBL-12614
  • Report No.: CONF-810347-2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6509371
  • Archival Resource Key: ark:/67531/metadc1204047

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  • March 1981

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 30, 2018, 2:04 p.m.

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Whittle, D. P. Oxidation Mechanisms for Alloys in Single-Oxidant Gases, article, March 1981; California. (digital.library.unt.edu/ark:/67531/metadc1204047/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.