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

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概要

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• 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 H<SUB>2</SUB>, O<SUB>2</SUB> and H<SUB>2</SUB>O<SUB>2</SUB> 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 NiFe<SUB>2</SUB>O<SUB>4</SUB> and (Fe, Ni)Cr<SUB>2</SUB>O<SUB>4</SUB> ; 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 H<SUB>2</SUB>O<SUB>2</SUB> is due to the properties of NiO and CoO ; namely high solubilities and high diffusion coefficients of metal ions.

著者

• 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.

関連論文

• Protective Oxide Film on Alloy X750 Formed in Air at 973K.
• General Corrosion of Materials under Simulated BWR Primary Water Conditions.
• Electrochemical Considerations Regarding General Corrosion of Materials in a BWR Primary Circuit.
• BWR plants with low shutdown radiation level. Design and construction of plants and current experience with occupational exposure of plants.:Design and Construction of Plants and Current Experience with Occupational Exposure of Plants

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