Crack detection by harmonics analysis of the polarization current during corrosion fatigue of iron

Eiji Tada, Kazuhiko Noda, Shinji Kumai, Tooru Tsuru

Research output: Contribution to journalArticle

3 Citations (Scopus)


Corrosion fatigue tests of a commercial iron with a hole were carried out in a borate buffer solution containing 5 mol/m 3 NaCl at a constant passive potential. Polarization current behavior induced by strain cycles has been investigated in order to detect crack initiation from the hole and used for the estimation of corrosion fatigue damages. The amplitude of the polarization current synchronized with the strain cycle and the phase shift between the polarization current and the strain were calculated from the polarization current behavior. The second harmonics component of the polarization current was also calculated. In the early stage of the corrosion fatigue test, the phase shift was almost constant and the second harmonics component was not detected. However, the phase shift decreased and the second harmonics component of the polarization current increased with increasing fatigue cycle. It is considered that changes of the phase shift and the second harmonics component of the polarization current result from crack initiation and the early stage of crack propagation from the hole.

Original languageEnglish
Pages (from-to)276-282
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number3
Publication statusPublished - 1998
Externally publishedYes



  • Corrosion fatigue
  • Crack initiation
  • Iron
  • Polarization current

ASJC Scopus subject areas

  • Metals and Alloys

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