Effects of partially substituting cobalt for nickel on the corrosion resistance of a Ni-16Cr-15Mo alloy to aqueous hydrofluoric acid

Yunping Li, Xiuru Fan, Ning Tang, Huakang Bian, Yuhang Hou, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

This study examined the effect of partially substituting cobalt for nickel in Ni-16Cr-15Mo alloy on corrosion resistance to 5.2. M HF acid solution at 100. °C. Microstructural characterisations revealed that cobalt substitution did not have a detrimental effect on corrosion resistance, but rather, it seems to enhance the formation of a compact and thin Mo-rich passive film by selective dissolution of elements. Heat-annealing drastically lowered the corrosion resistance due to Mo-rich precipitate of alloy, which lowered the concentration of Mo in bulk matrix, in particular close to precipitate sections, leading to inhibition of formation of homogenous and compact Mo-rich passive film.

Original languageEnglish
Pages (from-to)101-110
Number of pages10
JournalCorrosion Science
Volume78
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • A. Acid solutions
  • A. Alloy
  • A. Cobalt
  • A. Nickel
  • C. Acid corrosion
  • C. Interfaces

ASJC Scopus subject areas

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

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