Oxidation of Metals

, Volume 33, Issue 5–6, pp 357–369 | Cite as

Effect of internal oxidation pretreatments and Si contamination on oxide-scale growth and spalling

  • P. Y. Hou
  • J. Stringer


Internal oxidation pretreatments carried out in quartz capsule with a Rhines pack were found to have a profound effect on the subsequent oxidation behavior of alloys. Specimens of Co-15 wt.% Cr, Co-25 wt.% Cr, Ni-25 wt.% Cr, and Ni-25 wt.% Cr-1 wt.% Al were tested at 1100°C after pre-oxidation treatments. Even without the development of internal oxide particles, pretreated binary CoCr and NiCr alloys oxidized with significantly lower rates. Selective oxidation of chromium was observed on the non-Cr2O3-forming Co-base alloys, whereas on the Cr2O3-forming Ni-base alloys, elimination of base-metal oxide, reduction in the Cr2O3 growth rate, and better scale adhesion were found. These effects were more apparent with pre-oxidation temperatures greater than 1000°C and with longer pretreatment times. Contaimination of Si from the quartz is believed to be the cause.

Key words

silicon internal oxidation Cr2O3, reactive-element effect 


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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • P. Y. Hou
    • 1
  • J. Stringer
    • 2
  1. 1.Materials and Chemical Sciences DivisionLawrence Berkeley LaboratoryBerekeley
  2. 2.Electric Power Research InstitutePalo Alto

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