IMPEDANCE DIAGRAMS OF 18-8 STAINLESS STEEL IN PASSIVE AND TRANSPASSIVE STATES IN Na2SO4 SOLUTIONS.

Nobuyoshi Hara, Katsuhisa Sugimoto, Yoshinobu Sawada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electrical properties of the interface of 18-8 stainless steel electrode in the passive and transpassive states were studied by using complex impedance diagrams measured in 1 M-Na//2SO//4 with pH 2. 0 and 6. 4. The diagrams obtained in the passive region always showed distorted hemicircles which wre equivalent to the impedance loci of the electrical circuits having several parallel RC circuits connected in series. Therefore, passive films are thought to be composed of several layers whose electrical properties are different from one another. In the transpassive region, the diagrams measured exhibited an inductive loop at extremely low frequencies in addition to a capacitative hemicircle which appeared at high frequencies. The appearance of an inductive loop means that the transpassive dissolution process contains a relaxation process with a large time constant.

Original languageEnglish
Pages (from-to)1304-1310
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume40
Issue number12
DOIs
Publication statusPublished - 1976 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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