Roles of Interstitial Nitrogen, Carbon, and Boron in Steel Corrosion: Generation of Oxyanions and Stabilization of Electronic Structure

Mariko Kadowaki, Arkapol Saengdeejing, Izumi Muto, Ying Chen, Gerald S. Frankel, Takashi Doi, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The effects of N, C, and B interstitials on the corrosion resistance of Fe were investigated in chloride-free boric-borate solutions at pH 6.0 and 8.0. In potentiodynamic polarization at pH 8.0, the anodic dissolution resistance of Fe-0.3N and Fe-0.3C in the active and passive regions was higher than that of pure Fe. NH4 + and NO2 - are considered to be dissolved chemical species that contribute to the higher corrosion resistance of Fe-0.3N. Potentiodynamic polarization measurements in a solution with HCO3 -indicated that HCO3 - also decreases the anodic current densities in the active and passive regions, suggesting that the formation of HCO- 3 contributes to the higher corrosion resistance of Fe-0.3C. First-principles calculations showed that the presence of N, C, and B in the Fe-lattice decreases the electronic density of states (DOS) at and near the Fermi level. The consistency between the active dissolution rates and the DOS at and near the Fermi levels of the specimens suggests that the more stable electronic structures occurred by the presence of N and C also result in the suppression of active dissolution of Fe. For Fe-0.3B and Fe-0.006B, the presence of iron boride precipitates promoted localized corrosion.

本文言語English
論文番号081503
ジャーナルJournal of the Electrochemical Society
167
8
DOI
出版ステータスPublished - 2020 1 5

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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