Corrosion mechanism of annealed equiatomic AlCoCrFeNi tri-phase high-entropy alloy in 0.5 M H2SO4 aerated aqueous solution

Chao Chun Yen, Hsueh Ning Lu, Ming Hung Tsai, Bo Wei Wu, Yu Chieh Lo, Chun Chieh Wang, Shou Yi Chang, Shiow Kang Yen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This work investigates the corrosion mechanism of annealed equiatomic AlCoCrFeNi tri-phase alloy in 0.5 M H2SO4 aerated aqueous solution. Experimental results indicate that the B2 matrix is preferentially corroded away while grain-boundary FCC and labyrinth-like BCC endure, consistent with the tendency of formation energy for monolayer hydroxide on the (001) plane of three phases calculated by the first principle based on density function theory. Furthermore, the stable passive current density is related to lower ksp values of Co(OH)3, Fe(OH)3, and Cr(OH)3, while the annealing effect on enhancing corrosion resistance is owing to the more uniformity of passive hydroxide film.

Original languageEnglish
Pages (from-to)462-471
Number of pages10
JournalCorrosion Science
Volume157
DOIs
StatePublished - 15 Aug 2019

Keywords

  • Alloy
  • EIS
  • Modeling studies
  • Passive film
  • Polarization
  • SEM

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