Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Yunping Li, Xiandong Xu, Yuhang Hou, Chen Zhang, Fenglin Wang, Kazuyo Omura, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The effect of 2. wt.% Cu addition on the corrosion resistance of Ni-30Co-16Cr-15Mo-6Fe alloy in hydrofluoric acid was investigated by immersion testing at 100. °C. Microstructural observations of the passive film of samples after immersion testing via various methods revealed that the small addition of Cu yielded a tremendous improvement in corrosion resistance, even after cold forging. In addition, the passivation of Ni-30Co-16Cr-15Mo-6Fe alloy by a Mo-oxide-dominated passive film was completely changed to passivation by a Cu-dominated one in Ni-30Co-16Cr-15Mo-6Fe-2Cu alloy during immersion in hydrofluoric acid solution because the segregation behaviour of Cu was much stronger compared to that of Mo.

Original languageEnglish
Pages (from-to)119-127
Number of pages9
JournalCorrosion Science
Volume98
DOIs
Publication statusPublished - 2015 Sep 1

Keywords

  • Acid corrosion
  • Acid solutions
  • Alloys
  • Cobalt
  • Interfaces
  • Nickel

ASJC Scopus subject areas

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

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