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

Journal Article · Fri Jan 31 23:00:00 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

---

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), Journal Name: Oxidation of Metals; (United States) Vol. 37:1-2; 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
360602 -- Other Materials-- Structure & Phase Studies
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM
CHROMIUM 53
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM ISOTOPES
CHROMIUM OXIDES
COAL GASIFICATION
COATINGS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFUSION
ELECTRON MICROSCOPY
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
GAS GENERATORS
GASIFICATION
GRAIN BOUNDARIES
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON
IRON 54
IRON ALLOYS
IRON BASE ALLOYS
IRON ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MANGANESE
MASS SPECTROSCOPY
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL
NICKEL 62
NICKEL ALLOYS
NICKEL ISOTOPES
NUCLEI
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PERMEABILITY
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS