Corrosion behavior of Fe-20Cr and Ni-20Cr alloys in Ar-H[sub 2]O-HBr gas mixtures at 1000 K

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00665259· OSTI ID:5069555

Oenay, B; Saito, Yasutoshi ^[1]

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1. 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), Vol. 40:1-2; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
CHROMIUM ALLOYS
CORROSION
HYDROGEN FUELS
SYNTHESIS
IRON ALLOYS
NICKEL ALLOYS
ARGON
CHROMIUM OXIDES
CORROSION PRODUCTS
EXPERIMENTAL DATA
HYDROBROMIC ACID
MIXTURES
NICKEL OXIDES
SCANNING ELECTRON MICROSCOPY
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
WATER
X-RAY DIFFRACTION
ALLOYS
BROMINE COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COHERENT SCATTERING
DATA
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
FLUIDS
FUELS
GASES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
MICROSCOPY
NICKEL COMPOUNDS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SCATTERING
SYNTHETIC FUELS
TRANSITION ELEMENT COMPOUNDS
080102* - Hydrogen- Production- Thermochemical Processes
360105 - Metals & Alloys- Corrosion & Erosion