Characterisation of oxide films formed on Co-29Cr-6Mo alloy used in die-casting moulds for aluminium

Yunping Li, Ning Tang, Phacharaphon Tunthawiroon, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Oxide films formed at 700°C on Co-29Cr-6Mo alloy were characterised extensively to improve the corrosion resistance of the alloy to liquid Al, enabling its use in Al die-casting moulds. Film of duplex layer consisting of an outer CoO-rich layer and an inner Cr2O3-rich layer was observed in samples subjected to oxidation for 4h. With an increase in duration of oxidation, CoO was gradually replaced by Cr2O3, resulting in a single-layered oxide film dominantly composed of Cr2O3. The oxide film evolved with duration of oxidation treatment indicating the possibility of optimising films for Al die-casting moulds.

Original languageEnglish
Pages (from-to)72-79
Number of pages8
JournalCorrosion Science
Volume73
DOIs
Publication statusPublished - 2013 Aug 1

Keywords

  • A. Cobalt
  • B. SEM
  • B. XPS
  • C. Interfaces
  • C. Oxide coatings

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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