Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H2SO4

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Abstract

The pitting initiation site of an arc-melted equimolar CoCrFeMnNi alloy was investigated, and a method to improve the pitting corrosion resistance of the alloy was proposed. Cr–Mn–O inclusions with S-containing segments on the outer sections were observed; these S-containing segments served as the pitting initiation sites. The S-containing inclusions were removed by potentiostatic polarization and immersion in H2SO4, but pitting corrosion resistance after treatment did not improve. By potentiodynamic polarization in H2SO4, the S-containing inclusions were removed and the passive film on the alloy matrix became Cr enriched, resulting in a significant improvement in the pitting corrosion resistance.

Original languageEnglish
Article number109748
JournalCorrosion Science
Volume191
DOIs
Publication statusPublished - 2021 Oct

Keywords

  • A. High-entropy alloys
  • B. AES
  • C. Non-metallic inclusions
  • C. Passivation
  • C. Pitting corrosion
  • C. Trenching

ASJC Scopus subject areas

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

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