The corrosion behavior of Ni-Nb alloys in a mixed gas of H sub 2 -H sub 2 O-H sub 2 S

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Oxidation of Metals; (United States)

OSTI ID:7019034

He, Yirong; Douglas, D L; Gesmundo, F

The corrosion behavior of Ni-Nb alloys containing up to 40 wt.% Nb was studied over the temperature range of 550-800 C. in a mixed H{sub 2}/H{sub 2}O/H{sub 2}S gas. The scales formed on all alloys were multilayered. The outer scale was single-phase Ni{sub 3}S{sub 2}, while the structure and constitution of the inner scale depended on alloy composition and reaction conditions. Internal oxidation has been found in Ni-20Nb and Ni-30Nb, external oxidation has been observed on Ni-34Nb. Platinum markers were located at the interface between the outer scale and inner scale. The decrease in corrosion rate with increasing Nb content may be attributed to the presence of increasing amounts of Ni-Nb double sulfides as well as to the presence of Nb{sub 2}O{sub 5}in the inner region of the scale.

• OSTI ID: 7019034
• Journal Information: Oxidation of Metals; (United States), Journal Name: Oxidation of Metals; (United States) Vol. 37:3-4; ISSN 0030-770X; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ACTIVATION ENERGY
ALLOYS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL GASIFICATION
COHERENT SCATTERING
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRYSTAL STRUCTURE
DATA
DIAGRAMS
DIFFRACTION
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FLUIDS
GASES
GASIFICATION
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INFORMATION
INTERFACES
INTERMETALLIC COMPOUNDS
KINETICS
MICROANALYSIS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NICKEL COMPOUNDS
NICKEL SULFIDES
NIOBIUM ALLOYS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NIOBIUM SULFIDES
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUMERICAL DATA
OPTICAL MICROSCOPY
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
PHASE DIAGRAMS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPECTROSCOPY
SULFIDATION
SULFIDES
SULFUR
SULFUR COMPOUNDS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
VAPORS
WATER VAPOR
WEIGHT
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY