XPS Analysis of Oxide Formed on the Surface of Co-28Cr-6Mo-1Si Alloy Oxidized at 550°C

Abstract:

This work investigated the influence of oxidation durations on the formation of oxide on the surface of wrought Co-28Cr-6Mo-1Si alloy. The iso-thermal oxidation was individually performed in air at 550°C for 4, 12 and 24 h. For comparison, the surface of the non-oxidized Co-28Cr-6Mo-1Si alloy was concurrently examined. The chemical compositions of the non-oxidized and oxidized alloys were principally analyzed via X-ray photoelectron spectroscopy (XPS). The XPS results revealed that the surface of the non-oxidized alloy enriched in Cr-oxide. After oxidation treatment, the Co-oxide, existing as Co²⁺ state was observed coexisting with two Cr-oxide states, Cr³⁺ and Cr⁴⁺. The low concentrations of Mo⁶⁺ were also observed on the oxidized alloy surface. With the increase in oxidation durations, the Co-oxide was suppressed by Cr-oxide. The XPS depth profile analysis indicated that the thickness of the oxide film increased with increasing the oxidation duration.

• Periodical: Key Engineering Materials (Volume 845)
• Pages: 95-100
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.845.95
• Online since: May 2020
• Authors: Phacharaphon Tunthawiroon*, Mettaya Kitiwan, Patthranit Wongpromrat, Akihiko Chiba
• Keywords: Co-Cr-Mo Alloys, Dental, Dental Restoration, Oxidation, Oxide Film, PFM, XPS Analysis

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