Xps analysis of oxide formed on the surface of co-28cr-6mo-1si alloy oxidized at 550 ºc

Phacharaphon Tunthawiroon, Mettaya Kitiwan, Patthranit Wongpromrat, Akihiko Chiba

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


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 550ºC 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.

Original languageEnglish
Title of host publicationFunctional Materials
EditorsShu Yin, Alexander Pesin
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783035716009
Publication statusPublished - 2020
EventInternational Conference on Functional Materials, ICFM 2019 - Sendai, Japan
Duration: 2019 Sep 42019 Sep 6

Publication series

NameKey Engineering Materials
Volume845 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795


ConferenceInternational Conference on Functional Materials, ICFM 2019


  • Co-Cr-Mo alloys
  • Dental
  • Dental restoration
  • Oxidation
  • Oxide film
  • PFM
  • XPS analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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