BWR環境において鉄鋼材料表面に形成した酸化皮膜のキャラクタリゼーション

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タイトル別名
  • Characterization of Oxide Films Formed on Steels in a BWR Environment
  • BWR カンキョウ ニ オイテ テッコウ ザイリョウ ヒョウメン ニ ケイセイ

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Environmental effects on corrosion behaviors and properties of oxide films were evaluated for austenitic stainless and carbon steels in high-temperature water simulating a Boiling Water Reactor condition. The existence ratios of Cr and OH- in oxide films formed on stainless steel decreased and those of Fe, Ni and O2- increased with increases of temperature and dissolved oxygen concentration. Changes of pH in the test region did not affect the composition of these species. These results indicated that Cr tended to combine with OH-, i. e., Cr existed as hydroxides or oxyhydroxides. Further, Fe and Ni tended to form spinel type oxides, which were identified by XRD. In addition, the corrosion resistance of stainless steel was higher than that of carbon steel in all environments. The protectivity of magnetite films on carbon steel increased with temperature, dissolved oxygen concentration and pH. However, Ni ferrite, formed on stainless steel, further improved the corrosion resistance under such conditions. On the other hand, as the solubility of magnetite increased with decreases in the above mentioned factors, the corrosion resistance of carbon steel decreased. But, even under such conditions Cr, contained in stainless steel, tended to form stable films and suppressed corrosion.

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