Electrochemical Considerations Regarding General Corrosion of Materials in a BWR Primary Circuit.

• HEMMI Yukio

  Nuclear Engineering Laboratory, Toshiba Corp.

• ICHIKAWA Nagayoshi

  Nuclear Engineering Laboratory, Toshiba Corp.

• SAITO Norihisa

  Nuclear Engineering Laboratory, Toshiba Corp.

• MASUDA Takahisa

  Energy System Group, Toshiba Corp.

抄録

Electrochemical calculations of 3d-transition metal (Fe, Ni, Co and Cr)-water systems at 558 K were performed to evaluated the general corrosion behavior of materials in a BWR primary circuit. Thermodynamics expressed by Pourbaix diagrams, the solubilities of oxides and the equilibrium activities of H₂, O₂ and H₂O₂ in oxide formations, and kinetics determining the corrosion potential and corrosion rate of the materials were evaluated. The results assist recognition of the following corrosion behaviors:<BR>(1) Good corrosion resistance of type 304 SS under various water chemistry conditions is due to the properties of NiFe₂O₄ and (Fe, Ni)Cr₂O₄ ; namely wide stable regions and low diffusion coefficients of metal ions and the ability of these oxides to compensate for each others weakness.<BR>(2) A typical increase of the corrosion rate of Alloy X750 and Stellite #6 in an oxygenated aqueous environment containing H₂O₂ is due to the properties of NiO and CoO ; namely high solubilities and high diffusion coefficients of metal ions.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　Ｎｕｃｌｅａｒ　Ｓｃｉｅｎｃｅ　ａｎｄ　Ｔｅｃｈｎｏｌｏｇｙ（日本原子力学会英文論文誌）

  Ｊｏｕｒｎａｌ　ｏｆ　Ｎｕｃｌｅａｒ　Ｓｃｉｅｎｃｅ　ａｎｄ　Ｔｅｃｈｎｏｌｏｇｙ（日本原子力学会英文論文誌） 31 (11), 1202-1213, 1994

  一般社団法人 日本原子力学会

キーワード

• electrochemistry
• corrosion
• iron
• nickel
• cobalt
• chromium
• corrosion potential
• stainless steel-304
• Alloy X750
• Stellite #6
• high-temperature water
• Pourbaix diagram
• solubility
• ferrites
• nickel oxides
• cobalt oxides
• chromium oxides
• diffusion
• metal ions

詳細情報

• CRID: 1390001204095429760
• NII論文ID: 130000825572
• DOI: 10.3327/jnst.31.1202
• COI: 1:CAS:528:DyaK2MXitlChsLo%3D
• ISSN: 18811248
• ISSN: 00223131
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可