Oxidation of minor elements from an iron-nickel-chromium-cobalt-phosphorus alloy in 17.3% CO 2-H 2 gas mixtures at 700-1000 °c

Dante Lauretta, Britney E. Schmidt

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Fe-Ni-Cr-Co-P alloys were exposed to 17.3% CO 2-H 2 gas mixtures to investigate the oxidation of minor elements in metallic alloys in the early solar system. Reaction temperatures varied between 700 and 1000 °C. Gas-phase equilibrium was attained at 800, 900, and 1000 °C, yielding H 2-H 2O-CO-CO 2 gas mixtures. Experiments at 700 and 750 °C did not achieve gas-phase equilibrium and were performed in H 2-CO 2 gas mixtures. Reaction timescales varied from 1 to 742 h. The experimental samples were characterized using optical microscopy, electron microprobe analysis, wavelength-dispersive- spectroscopy X-ray elemental mapping, and X-ray diffraction. In all experiments Cr experiences internal oxidation to produce inclusions of chromite (FeCr 2O 4) and eskolaite (Cr 2O 3) and surface layers of Cr-bearing magnetite [(Fe,Cr) 3O 4]. At 900 and 1000 °C, P is lost from the alloy via diffusion and sublimation from the metal surface. Analysis of P zoning profiles in the remnant metal cores allows for the determination of the P diffusion coefficient in the bulk metal, which is constant, and the internally oxidized layer, which is shown to vary linearly with distance from the metal surface. At 800 and 900 °C, P oxidizes to form a surface layer of graftonite [Fe 3(PO 4) 2] while at 700 and 750 °C P forms inclusions of the phosphide-mineral schreibersite [(Fe,Ni) 3P].

Original languageEnglish (US)
Pages (from-to)219-235
Number of pages17
JournalOxidation of Metals
Volume71
Issue number3-4
DOIs
StatePublished - Apr 2009

Fingerprint

Chromium
Carbon Monoxide
Cobalt
Nickel
Gas mixtures
Chemical elements
Phosphorus
Iron
Metals
Oxidation
Phase equilibria
Bearings (structural)
Gases
Ferrosoferric Oxide
Internal oxidation
Chromite
Zoning
Solar system
Sublimation
Electron probe microanalysis

Keywords

  • Chromite (FeCr O )
  • Eskolaite (Cr O )
  • Fe-Ni-Cr-Co-P alloy
  • Graftonite (Fe [PO ] )
  • Magnetite (Fe O )
  • Oxidation
  • Schreibersite ([Fe,Ni] P)

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Materials Chemistry
  • Metals and Alloys

Cite this

Oxidation of minor elements from an iron-nickel-chromium-cobalt-phosphorus alloy in 17.3% CO 2-H 2 gas mixtures at 700-1000 °c. / Lauretta, Dante; Schmidt, Britney E.

In: Oxidation of Metals, Vol. 71, No. 3-4, 04.2009, p. 219-235.

Research output: Contribution to journalArticle

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abstract = "Fe-Ni-Cr-Co-P alloys were exposed to 17.3{\%} CO 2-H 2 gas mixtures to investigate the oxidation of minor elements in metallic alloys in the early solar system. Reaction temperatures varied between 700 and 1000 °C. Gas-phase equilibrium was attained at 800, 900, and 1000 °C, yielding H 2-H 2O-CO-CO 2 gas mixtures. Experiments at 700 and 750 °C did not achieve gas-phase equilibrium and were performed in H 2-CO 2 gas mixtures. Reaction timescales varied from 1 to 742 h. The experimental samples were characterized using optical microscopy, electron microprobe analysis, wavelength-dispersive- spectroscopy X-ray elemental mapping, and X-ray diffraction. In all experiments Cr experiences internal oxidation to produce inclusions of chromite (FeCr 2O 4) and eskolaite (Cr 2O 3) and surface layers of Cr-bearing magnetite [(Fe,Cr) 3O 4]. At 900 and 1000 °C, P is lost from the alloy via diffusion and sublimation from the metal surface. Analysis of P zoning profiles in the remnant metal cores allows for the determination of the P diffusion coefficient in the bulk metal, which is constant, and the internally oxidized layer, which is shown to vary linearly with distance from the metal surface. At 800 and 900 °C, P oxidizes to form a surface layer of graftonite [Fe 3(PO 4) 2] while at 700 and 750 °C P forms inclusions of the phosphide-mineral schreibersite [(Fe,Ni) 3P].",
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N2 - Fe-Ni-Cr-Co-P alloys were exposed to 17.3% CO 2-H 2 gas mixtures to investigate the oxidation of minor elements in metallic alloys in the early solar system. Reaction temperatures varied between 700 and 1000 °C. Gas-phase equilibrium was attained at 800, 900, and 1000 °C, yielding H 2-H 2O-CO-CO 2 gas mixtures. Experiments at 700 and 750 °C did not achieve gas-phase equilibrium and were performed in H 2-CO 2 gas mixtures. Reaction timescales varied from 1 to 742 h. The experimental samples were characterized using optical microscopy, electron microprobe analysis, wavelength-dispersive- spectroscopy X-ray elemental mapping, and X-ray diffraction. In all experiments Cr experiences internal oxidation to produce inclusions of chromite (FeCr 2O 4) and eskolaite (Cr 2O 3) and surface layers of Cr-bearing magnetite [(Fe,Cr) 3O 4]. At 900 and 1000 °C, P is lost from the alloy via diffusion and sublimation from the metal surface. Analysis of P zoning profiles in the remnant metal cores allows for the determination of the P diffusion coefficient in the bulk metal, which is constant, and the internally oxidized layer, which is shown to vary linearly with distance from the metal surface. At 800 and 900 °C, P oxidizes to form a surface layer of graftonite [Fe 3(PO 4) 2] while at 700 and 750 °C P forms inclusions of the phosphide-mineral schreibersite [(Fe,Ni) 3P].

AB - Fe-Ni-Cr-Co-P alloys were exposed to 17.3% CO 2-H 2 gas mixtures to investigate the oxidation of minor elements in metallic alloys in the early solar system. Reaction temperatures varied between 700 and 1000 °C. Gas-phase equilibrium was attained at 800, 900, and 1000 °C, yielding H 2-H 2O-CO-CO 2 gas mixtures. Experiments at 700 and 750 °C did not achieve gas-phase equilibrium and were performed in H 2-CO 2 gas mixtures. Reaction timescales varied from 1 to 742 h. The experimental samples were characterized using optical microscopy, electron microprobe analysis, wavelength-dispersive- spectroscopy X-ray elemental mapping, and X-ray diffraction. In all experiments Cr experiences internal oxidation to produce inclusions of chromite (FeCr 2O 4) and eskolaite (Cr 2O 3) and surface layers of Cr-bearing magnetite [(Fe,Cr) 3O 4]. At 900 and 1000 °C, P is lost from the alloy via diffusion and sublimation from the metal surface. Analysis of P zoning profiles in the remnant metal cores allows for the determination of the P diffusion coefficient in the bulk metal, which is constant, and the internally oxidized layer, which is shown to vary linearly with distance from the metal surface. At 800 and 900 °C, P oxidizes to form a surface layer of graftonite [Fe 3(PO 4) 2] while at 700 and 750 °C P forms inclusions of the phosphide-mineral schreibersite [(Fe,Ni) 3P].

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