Corrosion resistance of Cu- and Fe-modified Ni-30Co-16Cr-15Mo alloy in aqueous hydrofluoric acid

Chen Zhang, Yunping Li, Yuhang Hou, Ning Tang, Kazuyo Ohmura, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The effect of Cu and Fe addition on the corrosion resistance of Ni-30Co-16Cr-15Mo in hydrofluoric acid was investigated by immersion testing at 100. °C. Microstructural observation revealed that adding 15. wt.% Fe gives rise to a significantly deteriorated corrosion resistance that is characterized by preferential dissolution along grain boundaries, especially in cold-forged sample. Meanwhile, alloy modified with 15. wt.% Fe and 2. wt.% Cu exhibited a tremendous improvement in corrosion resistance, even after cold forging. This is probably attributed to the rapid formation of a Cu-rich passive film, which is ascribable to the noble nature and high reorganising ability of Cu.

Original languageEnglish
Pages (from-to)81-92
Number of pages12
JournalCorrosion Science
Volume89
Issue numberC
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Acid corrosion
  • Cobalt
  • Nickel
  • Passive films
  • SEM
  • XRD

ASJC Scopus subject areas

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

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