Corrosion Resistance of Low Alloy Steels for Overpack Container in Compressed Bentonite Containing water

Takashi Tsushima, Nobuyoshi Hara, Katsuhisa Sugimoto

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

It is important to examine the effect of corrosion products on the corrosion rate of carbon steel overpack container for the geological disposal of radioactive wastes. In order to understand the influence of Fe 3O4 film as the corrosion product, the corrosion behavior of carbon steel with and without Fe3O4 film produced by oxidization in a concentrated alkali solution was examined. The result of immersion corrosion tests in compressed bentonite containing water showed that the corrosion of carbon steel was promoted by the self-reduction reaction of Fe3O4 film, and that the most stable corrosion product in the test environment was a mixture of FeCO3 and Fe 2(OH)2CO3. Then, to reveal the effect of alloying elements on the corrosion of the steel in the test environment, several kinds of low alloy steel were prepared by adding various metallic elements to the steel. The corrosion resistance of the low alloy steels with and without Fe3O4 film was examined. The result showed the corrosion of the steels was suppressed by the addition of Cu, Ti, and Cr, independently of the existence of Fe3O4 film. Among them, Cu showed the highest suppression effect.

Original languageEnglish
Pages (from-to)545-553
Number of pages9
JournalZairyo to Kankyo/ Corrosion Engineering
Volume52
Issue number10
DOIs
Publication statusPublished - 2003

Keywords

  • Alloying elements
  • Carbon steel
  • Compressed bentonite
  • Corrosion rate
  • Magnetite film
  • Overpack container

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrochemistry
  • Materials Chemistry

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