Effects of Al, Ti, and Zr doping on oxide film formation in Co-29Cr-6Mo alloy used as mould material for Al die-casting

Yunping Li, Phacharaphon Tunthawiroon, Ning Tang, Huakang Bian, Fenglin Wang, Shihai Sun, Yan Chen, Kazuyo Omura, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The reactive-element (RE) effect in chromia-forming-alloys on the adherence properties of the oxide scale is well known. A comparative study of chromia scale in four Co-Cr-Mo alloys, an undoped and three doped with 0.5. wt% Al/Ti/Zr, is conducted under FESEM/EPMA, LSM, and XPS. After air oxidation at 700. °C for 24. h, all doped alloys show a thinner, smoother oxide scale with enhanced adherence. The cross-sectional compositional maps show significant increase in the concentration of Ti in the oxide scale, and Al near the oxide/alloy interface. The reactive elements inhibited the diffusion of Cr and O ions, formed oxide preferentially, and eliminated the void formation at the oxide/alloy interface.

Original languageEnglish
Pages (from-to)147-158
Number of pages12
JournalCorrosion Science
Volume84
DOIs
Publication statusPublished - 2014 Jul

Keywords

  • A. Cobalt
  • B. SEM
  • B. XPS
  • C. Interfaces
  • C. Oxidation

ASJC Scopus subject areas

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

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