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高温水中に浸漬したSUS316L表面の$$gamma$$線照射による変化

Changes of the surface of SUS316L immersed in high-temperature water caused by $$gamma$$-ray irradiation

中原 由紀夫 ; 山本 正弘 ; 石島 暖大 ; 加藤 千明  

Nakahara, Yukio; Yamamoto, Masahiro; Ishijima, Yasuhiro; Kato, Chiaki

高温水中腐食環境の放射線照射による変化について検討するため、SUS316L試験片を、288$$^{circ}$$C純水中に$$gamma$$線照射条件(吸収線量率$$sim$$30kGy/h)と非照射条件で500時間浸漬した。試験後に試験片の表面分析を実施し、$$gamma$$線照射の有無による違いを比較した。1枚単独で浸漬した試験片の表面近傍断面をTEMにより観察した結果、$$gamma$$線照射により酸化皮膜が成長し、表面での酸化物粒子の生成が顕著となっていた。$$gamma$$線照射により腐食環境が変化し、酸化物の析出が促進されたと考えられる。すき間部を模擬して浸漬した試験片のすき間内表面をレーザーラマン分光装置により分析した結果、非照射条件ではピークが見られなかったが、$$gamma$$線照射条件ではFe, Ni, Crの複合酸化物のピークが観察された。すき間内部でも、$$gamma$$線照射により腐食環境が変化し、腐食が促進されたと推定される。

500-hour experiments have been done in order to study the effects of $$gamma$$-ray irradiation (the absorption rate $$sim$$ 30 kGy/h) on the corrosion of 316L stainless steel immersed in high-temperature (288 $$^{circ}$$C) water. Difference between $$gamma$$-ray irradiated and non-irradiated specimen surfaces were discussed with the results of surface analyses after the experiments. TEM cross sections of the surfaces of specimens solely immersed in the water show that $$gamma$$-ray irradiation made surface oxide film thicker and the formation of oxide grains on the surface more apparent. The change of corrosive environment caused by the irradiation enhanced the precipitation of oxide on the surface. Surface analysis of crevice-simulating specimens was also done by laser Raman spectroscopy. No definite peak was seen in the spectrum of non-irradiated condition. The peaks of compound oxide of Fe, Ni, and Cr were seen in the spectrum of $$gamma$$-ray irradiated condition. These results should indicate that the change of corrosive environment inside the crevice caused by the irradiation promoted the corrosion.

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