Anodic polarization characteristics and electrochemical properties of Fe3C in chloride solutions

Mariko Kadowaki, Izumi Muto, Kinari Takahashi, Takashi Doi, Hiroyuki Masuda, Hideki Katayama, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara

研究成果: Article査読

5 被引用数 (Scopus)

抄録

The anodic polarization behavior of cementite (Fe3C), which was prepared by gas carburizing, was investigated in 10 mM NaClcontaining boric-borate buffers with pH values of 6.0, 7.0 and 8.0. The active dissolution current of the Fe3C was found to be lower than that of the ferrite. This suggests that the corrosion resistance of the Fe3C was clearly higher than that of the ferrite. From the potential-pH diagrams, carbon was predicted to be generated on the Fe3C at lower potentials during the anodic polarization, and the existence of carbon was confirmed by XPS. The carbon layer seems to act as a protective film and suppress the active dissolution of the Fe3C at lower potentials. AES depth profiles clarified that iron oxide layers existed not only on the ferrite but also on the Fe3C. The Volta potential of the Fe3C was approximately 40 mV higher than that of the ferrite. The higher Volta potential of the Fe3C layer seemed to be associated with the nature of the oxide film formed on the Fe3C, and there is a possibility that the passivation of the Fe3C at higher potentials is achieved by an oxide film.

本文言語English
ページ(範囲)C345-C351
ジャーナルJournal of the Electrochemical Society
166
12
DOI
出版ステータスPublished - 2019

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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