Corrosion behavior of Fe-20Cr and Ni-20Cr alloys in Ar-H[sub 2]O-HBr gas mixtures at 1000 K
- Tokyo Inst. of Technology (Japan)
Discontinuous mass-change measurements and corrosion-product analyses were made for Fe-20Cr and Ni-20Cr alloys after exposing them to Ar-H[sub 2]O-HBr gas mixtures at 1000 K for 24 hours. Predominantly chromia scales formed on both alloys. Upon cooling, the scales remained adherent to the Fe-20Cr alloy but spalled extensively from Ni-20Cr samples. After tests in HBr-rich gas mixtures, bromine-rich corrosion products were found underneath chromia scales on both alloys while nickel evaporation was observed from Ni-20Cr samples. Preoxidation of the Ni-20Cr alloy prior to exposure to Ar-H[sub 2]O-HBr gas mixtures increased chromia scale adherence but did not prevent nickel loss from the alloy. Chromia scales formed on the Fe-20Cr alloy were more protective due to the absence of iron oxides in the scale. Large NiO crystals formed over the Ni-20Cr alloy decreased chromia-scale adherence and increased nickel loss from the alloy due to the low stability of NiO in HBr-containing gas mixtures. 20 refs., 8 figs., 5 tabs.
- OSTI ID:
- 5069555
- Journal Information:
- Oxidation of Metals; (United States), Journal Name: Oxidation of Metals; (United States) Vol. 40:1-2; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
080102* -- Hydrogen-- Production-- Thermochemical Processes
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ARGON
BROMINE COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COHERENT SCATTERING
CORROSION
CORROSION PRODUCTS
DATA
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FUELS
GASES
HALOGEN COMPOUNDS
HYDROBROMIC ACID
HYDROGEN COMPOUNDS
HYDROGEN FUELS
INFORMATION
INORGANIC ACIDS
IRON ALLOYS
MICROSCOPY
MIXTURES
NICKEL ALLOYS
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SYNTHESIS
SYNTHETIC FUELS
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
WATER
X-RAY DIFFRACTION