Effect of Al on the high-temperature sulfidation of Fe-30Nb

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00738290· OSTI ID:5902256

Wang, Ge; Douglass, D L ^[1]; Gesmundo, F ^[2]

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1. Univ. of California, Los Angeles (United States)
2. Univ. di Genova (Italy)

Fe-30Nb-Al alloys containing up to 9.1 wt.% Al were sulfidized at 0.01 atm sulfur vapor over the temperature range of 600-900C. The sulfidation kinetics followed the parabolic rate law for all the alloys at all temperatures. The parabolic rate constants decreased with increasing Al content. Extremely slow sulfidation rates, even slower than that of pure Nb at low temperatures, were observed for alloys containing high Al (>4.8 wt.%). Duplex sulfide scales formed on alloys containing small amounts of Al. The outer layers were compact FeS, while the inner layers were a double sulfide, Fe{sub x}Nb{sub 2}S{sub 4}, containing partially sulfidized intermetallic islands. Very thin scales formed on the alloys containing high Al, but the nature of the scales is unknown. The intercalation of Al into the Nb-sulfides and the associated charge transfer induced a blockage of the transport of iron through the sulfide as well as a greater incorporation of Nb into the scale.

• OSTI ID: 5902256
• Journal Information: Oxidation of Metals; (United States), Journal Name: Oxidation of Metals; (United States) Vol. 35:3-4; ISSN 0030-770X; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CORROSION PRODUCTS
CRYSTAL STRUCTURE
DATA
DIAGRAMS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HARDNESS
HIGH TEMPERATURE
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON SULFIDES
KINETICS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROHARDNESS
MICROSTRUCTURE
NIOBIUM ALLOYS
NONMETALS
NUMERICAL DATA
PHASE DIAGRAMS
PHASE STUDIES
REACTION KINETICS
SCALING
SULFIDATION
SULFIDES
SULFUR
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS