Roles of alloying elements in the corrosion resistance of equiatomic CoCrFeMnNi high-entropy alloy and application to corrosion-resistant alloy design

Research output: Contribution to journalArticlepeer-review

Abstract

The equiatomic CoCrFeMnNi alloy and the equiatomic quaternary alloys with no addition of one element of the CoCrFeMnNi alloy were fabricated, and the roles of the alloying elements in corrosion resistance were clarified. In 1M H2SO4, the passivity of the CoCrFeMnNi alloy was mainly due to Cr. The Co and Fe additions also contributed the decrease in the passivity current density. While Ni addition was found to suppress active dissolution, Mn addition increased the active dissolution rate. The quaternary alloy without Mn indicated superior pitting corrosion resistance in 0.1M NaCl. To improve the corrosion resistance of the CoCrFeMnNi alloy, Mn was replaced with Mo, and the effect of the Mo content on the pitting corrosion resistance and the role of Co addition were assessed in 1M HCl.

Original languageEnglish
Pages (from-to)1677-1680
Number of pages4
JournalMaterials Transactions
Volume62
Issue number11
DOIs
Publication statusPublished - 2021

Keywords

  • Active dissolution
  • Canter alloy
  • High-entropy alloy
  • Passivity
  • Pitting

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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