The corrosion of an equimolar FeCoNiCrMn high-entropy alloy in various CO2/CO mixed gases at 700 and 950 °C

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • W. Kai
  • F.C. Chien
  • F.P. Cheng
  • R.T. Huang

Detail(s)

Original languageEnglish
Pages (from-to)150-161
Journal / PublicationCorrosion Science
Volume153
Online published26 Mar 2019
Publication statusPublished - Jun 2019

Abstract

The corrosion behavior of an equimolar FeCoNiCrMn high-entropy alloy was studied in various combination of CO2/COmixed gases at 700 and 950 °C, with the oxygen partial pressure range from 5.0 × 10−16 to 7.9 × 10−8 Pa. The alloy exclusively experienced oxidation, and its kinetics followed the parabolic rate law at both temperatures with the oxidation rates steadily increasing with oxygen pressure. This result demonstrated that a typical oxide scale exhibited a p-type semiconductivity. The scale formed on the alloy at 700 °C was thin, consisting of a mixture of MnO, (Mn,Fe)3O4 , and (Mn,Cr)3O4 , while the duplex scales formed at 950 °C consisted of an outer layer of (Mn,Fe)3O4 and, MnO, and an inner layer of (Mn,Cr)3O4 andMnO.

Research Area(s)

  • FeCoNiCrMn high-entropy alloy, Oxidation, Scales