Bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C

H. Chen, X. Hou, J. He, H. Guo

Research output: Journal PublicationArticlepeer-review

11 Citations (Scopus)

Abstract

This paper investigates the bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C. Free-standing CoNiCrAlY coatings and CoNiCrAlY coated IN738 were isothermally oxidised in air at 1100 °C for periods up to 100 h. It is found that the bioxidant corrosion occurred in the coated IN738 samples, in which the β phases in the CoNiCrAlY coating were significantly consumed by internal oxidation and internal nitridation. Aluminium nitrides and titanium nitrides were found to exist in the CoNiCrAlY coating after bioxidant corrosion. The internal nitridation is likely to occur when no protectives oxides can form at the coating surface.

Original languageEnglish
Pages (from-to)154-162
Number of pages9
JournalCorrosion Science
Volume151
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Bioxidant corrosion
  • CoNiCrAlY
  • IN738
  • Internal nitridation
  • β-phase depletion

ASJC Scopus subject areas

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

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