純水中における鉄鋼材料の腐食に及ぼす温度の影響

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  • Effect of Temperature on Corrosion of Steels in High Purity Water
  • ジュンスイチュウ ニ オケル テッコウ ザイリョウ ノ フショク ニ オヨボス

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Effect of temperature on corrosion behavior of steels was evaluated in the range of 150-300°C in high purity water containing about 200ppb oxygen. The exposure tests were carried out in actual and simulated reactor water of BWR plants. Through X-ray diffractometry, SIMS, XPS and chemical analyses, it was clarified that the chemical composition and morphology of oxide films formed on austenitic stainless steel changed above about 250°C. Chromium dissolved easily through corrosion above this temperature, and the oxide films primarily consisted of spinel type oxides containing high concentration of nickel. Further, as the protectivety of oxide films increased with temperature, the corrosion rate had a peak around 250°C after a long exposure period. A major phase of oxide films on carbon steel was magnetite in the whole temperature range. However, as the oxide films formed at high temperatures had very compact structures, the effect of temperature on the corrosion rate was similar to that observed on stainless steel.

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