The effects of straining frequency and stress ratio on polarization current responded to cyclic strain in a commercial iron

Eiji Tada, Kazuhiko Noda, Shinji Kumai, Tooru Tsuru

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Corrosion fatigue tests of a commercial iron were carried out using a cylindrical specimen with a hole in a borate buffer solution containing 5mol/m3 NaCl at a constant passive potential. Polarization current behavior induced by strain cycles has been investigated in order to elucidate the effects of straining frequency and stress ratio. The amplitude of polarization current synchronized with the strain cycle and the phase shift between the polarization current and the strain were calculated. The polarization current obtained prior to the crack initiation was found to be the charging and discharging current of the electric double layer capacitance. The corrosion damage increased as decreasing the straining frequency in the initial stage of crack propagation. The increased corrosion damage was observed at the reduced stress ratio.

Original languageEnglish
Pages (from-to)1189-1196
Number of pages8
JournalISIJ International
Volume37
Issue number12
DOIs
Publication statusPublished - 1997 Jan 1

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Keywords

  • Corrosion fatigue
  • Crack initiation
  • Electrochemical measurement
  • Iron
  • Straining frequency
  • Stress ratio

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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