Corrosion resistance of a high-silicon alloy in metal-dusting environments

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Abstract

A Si-containing, high-temperature alloy (Fe-17Cr-9Ni-8Mn-4Si) was exposed to high-carbon activity and low-oxygen partial pressure environments (CO-H 2) over a temperature range from 650 to 950 °C. No metal dusting corrosion was observed in this alloy. The structure and composition of the surface films formed were characterized in detail at the nanometer level. At a temperature of 650 °C, the surface-oxide films formed are made up of an inner, continuous, amorphous-silica (SiO 2) layer and an outer crystalline manganese chromate (MnCr 2O 4) spinel layer with manganese oxide (MnO) crystals on the surface. By contrast, at a higher temperature of 950 °C, a more-complex layered structure is developed, comprising inner, continuous, amorphous SiO 2 and crystalline manganese-silicate (Mn 2SiO 4) layers and an outer crystalline Cr 2O 3/MnCr 2O 4 duplex layer with MnO crystals having variable textures on the surface.

Original languageEnglish (US)
Pages (from-to)215-234
Number of pages20
JournalOxidation of Metals
Volume67
Issue number3-4
DOIs
StatePublished - Apr 1 2007

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry

Keywords

  • Corrosion
  • High temperature
  • Metal Dusting
  • NITRONIC 60
  • Si-containing Alloy

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