Platinum-induced oxidation of chromium in O-2 at 800 °C

(creator_code:org_t)

2003
2003
Engelska.
Ingår i: Corrosion Science. - 0010-938X .- 1879-0496. ; 45:12, s. 2697-2703

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Abstract Ämnesord

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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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