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  • 1.
    Anghel, Clara
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Hörnlund, Erik
    KTH, Superseded Departments, Materials Science and Engineering.
    Hultquist, Gunnar
    KTH, Superseded Departments, Materials Science and Engineering.
    Limbäck, Magnus
    Gas phase analysis of CO interactions with solid surfaces at high temperatures2004In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 233, no 1-4, p. 392-401Article in journal (Refereed)
    Abstract [en]

    An in situ method including mass spectrometry and labeled gases is presented and used to gain information on adsorption of molecules at high temperatures (>300 degreesC). Isotopic exchange rate in H-2 upon exposure to an oxidized zicaloy-2 sample and exchange rate in CO upon exposure to various materials have been measured. From these measurements, molecular dissociation rates in respective system have been calculated. The influence of CO and N-2 on the uptake rate of H-2 in zirconium and oxidized zicaloy-2 is discussed in terms of tendency for adsorption at high temperatures. In the case of oxidized Cr exposed to CO gas With C-12, C-13, O-16 and O-18, the influence of H2O is investigated with respect to dissociation of CO molecules. The presented data supports a view of different tendencies for molecular adsorption of H2O, CO, N-2, and H-2 molecules on surfaces at high temperatures.

  • 2.
    Hultquist, Gunnar
    et al.
    KTH, Superseded Departments, Chemistry.
    Hörnlund, Erik
    KTH, Superseded Departments, Chemistry.
    Dong, Qian
    KTH, Superseded Departments, Chemistry.
    Platinum-induced oxidation of chromium in O-2 at 800 °C2003In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 45, no 12, p. 2697-2703Article in journal (Refereed)
    Abstract [en]

    The effects of porous Pt on the oxidation of Cr at 800degreesC have been studied with the (OSIMS)-O-18 technique, gas phase analysis and XPS. In oxide areas with Pt a pronounced inward oxygen transport takes place and a substantial oxide growth near the Cr substrate is observed. In oxide grown on areas without Pt the counts of CrO ions in SIMS and the binding energy of O (1s) in XPS depend on the distance from the area with Pt. The experimental observations are believed to be a consequence of a high dissociation efficiency of O-2 on areas with Pt in combination with a high diffusivity of O in external and internal oxide surfaces on areas both with and without Pt.

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