Influence of Mo concentration on corrosion resistance to HF acid solution of Ni-Co-Cr-Mo alloys with and without Cu

Yuhang Hou, Yunping Li, Fenglin Wang, Chen Zhang, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The corrosion resistance of Ni-30Co-16Cr-6Fe- xMo and Ni-30Co-16Cr-6Fe-2Cu- xMo (x = 7-15 wt%) alloys was investigated by immersion tests in 5.2. M HF solution at 100. °C. The weight loss of the Ni-30Co-16Cr-6Fe- xMo alloys relative to Mo concentration after immersion followed a Boltzmann equation. With decreasing Mo concentration, the Ni-30Co-16Cr-6Fe- xMo alloys first lost the Mo protection of the grain boundaries, then the annealing twin boundaries, and finally the grain matrix. In contrast, decreasing Mo content did not cause a significant increase in Ni-30Co-16Cr-6Fe-2Cu- xMo alloy weight loss, but led to a slightly preferential dissolution of both grain and annealing twin boundaries.

Original languageEnglish
Pages (from-to)185-193
Number of pages9
JournalCorrosion Science
Volume99
DOIs
Publication statusPublished - 2015 Oct 1

Keywords

  • Acid corrosion (C)
  • Acid solutions (A)
  • Alloy (A)
  • Cobalt (A)
  • Interfaces (C)
  • Nickel (A)

ASJC Scopus subject areas

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

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