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 language | English (US) |
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Pages (from-to) | 215-234 |
Number of pages | 20 |
Journal | Oxidation of Metals |
Volume | 67 |
Issue number | 3-4 |
DOIs | |
State | Published - Apr 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