High temperature corrosion of iron in sulfur containing atmospheres
The simultaneous oxidation-sulfidation of pure iron in CO/sub 2/-10%SO/sub 2/ atmospheres has been studied at 871/sup 0/C. Although thermodynamic calculations predict the formation of an oxide layer, complex product layers of oxide and sulfide porous structures are observed. The sulfide within the scale is formed due to depletion of oxygen adjacent to the scale/gas interface, shifting the thermodynamic equilibrium to a sulfide stable region. The scale consists of three layers. The outer layer is a magnetite matrix, containing sulfide-rich streaks and protrusions. The inner layer is a mixture of wustite and sulfide. At the scale/metal interface, there is a layer of large grains formed by inward diffusion of anions. The protrusions on the scale are thought to be developed by the fast transport of iron ions through the sulfide-rich streaks. The wrinkles which spread all over the scale surface are due to grain boundary diffusion. Unbalanced diffusion is proposed to account for the formation of the porous structure.
- Research Organization:
- Lawrence Berkeley Laboratory and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5219140
- Journal Information:
- Proc. - Electrochem. Soc.; (United States), Journal Name: Proc. - Electrochem. Soc.; (United States) Vol. 83-5; ISSN PESOD
- Country of Publication:
- United States
- Language:
- English
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High temperature corrosion of iron in sulfur containing atmospheres
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
CALCULATION METHODS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
CORROSION PRODUCTS
CORROSIVE EFFECTS
ELEMENTS
IRON
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SCALING
SULFIDATION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE GRADIENTS
THERMODYNAMICS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE