High-temperature sulfidation of iron in H sub 2 /H sub 2 S/CO/CO sub 2 mixtures

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2085945· OSTI ID:7111285

Wilson, D F; Devereux, O F ^[1]

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1. Connecticut Univ., Storrs, CT (United States). Dept. of Metallurgy

This paper reports on the sulfidation of iron in mixed oxidant environments characteristic of gas turbines and coal gasifiers. In such environments of low oxygen potential the oxide films which normally provide protection to metals and alloys do not form or are readily penetrated by other oxidants that may be present, permitting rapid substrate attack. Sulfidation kinetics and scale morphologies are reported for iron at 900{degrees} C in H{sub 2}S/H{sub 2} and H{sub 2}S/H{sub 2}/CO{sub 2}/CO environments within the FeS-stable domain. At short times an increasing reaction rate was seen which can be explained by the nucleation and growth of scale nuclei on the surface. This process was, in part, diffusion controlled in the gas phase as seen by flow rate sensitivity. Subsequent reaction kinetics were consistent with a diffusion-controlled scale growth coupled with a linear degradation process which resulted in an inner barrier scale of stable thickness, an outer, growing scale which was nonbarrier in its behavior, and a linear scaling rate. The presence of CO{sub 2} was manifested in an effect on the early nucleation rate and on the subsequent parabolic growth constant.

• OSTI ID: 7111285
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 138:7; ISSN JESOA; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
33 ADVANCED PROPULSION SYSTEMS
330103 -- Internal Combustion Engines-- Turbine
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL GASIFICATION PLANTS
CONTROL
CORROSION
CORROSION INHIBITORS
CORROSIVE EFFECTS
DIFFUSION
ELECTROCHEMICAL CORROSION
ELEMENTS
EQUIPMENT
FATIGUE
FILMS
GAS TURBINES
INDUSTRIAL PLANTS
IRON
KINETICS
MACHINERY
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REDOX POTENTIAL
SCALE CONTROL
STRESS CORROSION
SULFIDATION
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TESTING
THERMAL FATIGUE
THIN FILMS
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY