High-temperature corrosion of iron in sulfur-containing atmospheres. [CO/sub 2/-10% SO/sub 2/ at 871/sup 0/C]

Technical Report · Fri Oct 01 04:00:00 EDT 1982

OSTI ID:6499349

Yang, F C; Whittle, D P

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. 21 figures.

• Research Organization: Lawrence Berkeley Lab., CA (USA); California Univ., Berkeley (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6499349
• Report Number(s): LBL-15470; CONF-821015-5; ON: DE83006965
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSIVE EFFECTS
CRYSTAL STRUCTURE
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
IRON
METALS
MICROSTRUCTURE
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SCALING
SULFIDATION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE