Effect of impurity elements on localized corrosion of zirconium in chloride containing environment

Yusuke Tsutsumi, Izumi Muto, Shigeyuki Nakano, Junichi Tsukada, Tomoyo Manaka, Peng Chen, Maki Ashida, Yu Sugawara, Masayuki Shimojo, Nobuyoshi Hara, Hideki Katayama, Takao Hanawa

Research output: Contribution to journalArticlepeer-review

Abstract

To clarify the mechanism of localized corrosion on zirconium in chloride environments, corrosion tests of zirconium and its alloys were performed using conventional and micron-scale measurement systems with surface areas of 0.35 cm2 and less than 0.04 cm2, respectively. The pitting potential significantly dropped by more than 1 V when zirconium was alloyed with over 10 mol% of tin. Zr4Sn and Zr5Sn3 intermetallics hindered the formation of passive films on the substrate. Additionally, tin was found on the surface of a commercially pure zirconium. From the micron-scale measurement results, the inclusion with the highest concentration of tin (at least 0.44 mol%) in the tested area was selected as the preferential initiation site for pitting corrosion. Thus, tin played an important role in determining the corrosion resistance of zirconium in chloride environments.

Original languageEnglish
Article number141507
JournalJournal of the Electrochemical Society
Volume167
Issue number14
DOIs
Publication statusPublished - 2020 Nov

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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