Oxidation of Metals

, Volume 67, Issue 3–4, pp 215–234 | Cite as

Corrosion Resistance of a High-Silicon Alloy in Metal-Dusting Environments

Original Paper
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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–H2) 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 (SiO2) layer and an outer crystalline manganese chromate (MnCr2O4) 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 SiO2 and crystalline manganese-silicate (Mn2SiO4) layers and an outer crystalline Cr2O3/MnCr2O4 duplex layer with MnO crystals having variable textures on the surface.

Keywords

Metal Dusting Corrosion Si-containing Alloy NITRONIC®60 High temperature 
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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Corporate Strategic ResearchExxonMobil Research and Engineering CompanyAnnandaleUSA
  2. 2.Department of ChemistryPrinceton UniversityPrincetonUSA

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