Sulfidation/oxidation properties of iron-based alloys containing niobium and aluminum
Compatibility with mixed gases containing S, O, and Cl is a critical requirement for high-temperature alloys used in coal conversion and combustion applications. Comparative corrosion tests of Fe-25Cr-20Ni, Fe-18Cr-6Al, and Fe-9Cr-9Nb-6Al (wt %) at 700 to 800/degree/C in a simulated coal gasification environment led to the development of Fe-Nb-Al alloys and testing of both Fe-Nb-Al and Fe/sub 3/Al alloys. The niobium and aluminum content in the latter alloys ranged from 8 to 18 and 6 to 16 wt %, respectively. The niobium addition was intended as a selective refractory sulfide former. Testing was carried out at 700 to 800/degree/C in H/sub 2/S-H/sub 2/-H/sub 2/O gas mixtures with relatively low oxygen activities (less than or equal to10/sup /minus/22/ atm) and high sulfur activities (greater than or equal to10/sup /minus/6/ atm). Metallographic and chemical analyses of the corrosion product scales and the underlying alloy were performed to determine the role of the respective metallic elements on sulfidation/oxidation processes. 8 refs., 14 figs., 3 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5976513
- Report Number(s):
- ORNL/TM-11176; ON: DE89013766
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
014000 -- Coal
Lignite
& Peat-- Combustion
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL GASIFICATION
COMBUSTION
CORROSION
CORROSION PRODUCTS
CRYSTAL STRUCTURE
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON SULFIDES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NIOBIUM ALLOYS
OXIDATION
SCALING
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
010404* -- Coal
Lignite
& Peat-- Gasification
014000 -- Coal
Lignite
& Peat-- Combustion
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL GASIFICATION
COMBUSTION
CORROSION
CORROSION PRODUCTS
CRYSTAL STRUCTURE
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON SULFIDES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NIOBIUM ALLOYS
OXIDATION
SCALING
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS