Diffusion of cations in chromia layers grown on iron-base alloys

Journal Article · Sat Feb 01 00:00:00 EST 1992 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00665632· OSTI ID:5325582

Lobnig, R E; Hennesen, K; Grabke, H J ^[1]; Schmidt, H P

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1. Max-Planck Inst. fur Eisenforschung, Duesseldorf (West Germany)

Diffusion of the cations Cr, Fe, Mn, and Ni in Cr{sub 2}O{sub 3} has been investigated at 1,173 K. The diffusion measurements were performed on chromia layers grown on the model alloys Fe-20Cr and Fe-20Cr-12Ni in order to consider effects of small amounts of dissolved alien cations in Cr{sub 2}O{sub 3}. The samples were diffusion annealed in H{sub 2}-H{sub 2}O at an oxygen partial pressure close to the Cr{sub 2}O{sub 3}/Cr equilibrium. For all tracers the lattice-diffusion coefficients are 3-5 orders of magnitude smaller than the grain-boundary diffusion coefficients. The lattice diffusivity of Mn is about two orders of magnitude greater than the other lattice-diffusion coefficients, especially in Cr{sub 2}O{sub 3} grown on Fe-20Cr-12Ni. The values of the diffusion coefficients for Cr, Fe, and Ni are in the same range. Diffusion of the tracers in Cr{sub 2}O{sub 3} grown on different alloys did not show significant differences with the exception of Mn.

• OSTI ID: 5325582
• Journal Information: Oxidation of Metals; (United States), Vol. 37:1-2; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
01 COAL, LIGNITE, AND PEAT
CHROMIUM
DIFFUSION
CHROMIUM ALLOYS
PROTECTIVE COATINGS
CHROMIUM OXIDES
PERMEABILITY
GAS GENERATORS
CORROSION RESISTANT ALLOYS
IRON
IRON BASE ALLOYS
MANGANESE
NICKEL
NICKEL ALLOYS
CHROMIUM 53
COAL GASIFICATION
CORROSION RESISTANCE
CRYSTAL LATTICES
EXPERIMENTAL DATA
GRAIN BOUNDARIES
IRON 54
MASS SPECTROSCOPY
NICKEL 62
OXIDATION
SCANNING ELECTRON MICROSCOPY
TRACER TECHNIQUES
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM ISOTOPES
COATINGS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GASIFICATION
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON ALLOYS
IRON ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ISOTOPES
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion
360602 - Other Materials- Structure & Phase Studies
010404 - Coal
Lignite
& Peat- Gasification