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10227 Temperature Dependence of Oxide Film Thickness of Ni-Based Alloy in Deaerated High-Temperature Water

Picture for 10227 Temperature Dependence of Oxide Film Thickness of Ni-Based Alloy
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Product Number: 51300-10227-SG
ISBN: 10227 2010 CP
Author: Takumi Terachi, Tomoki Miyamoto, Takuyo Yamada, Nobuo Totsuka, Kiyotomo Nakata and Kenichi Takakura
Publication Date: 2010
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Temperature dependences of the oxide film thickness of nickel-based alloys were examined as a mechanistic study of low potential stress corrosion cracking (LPSCC). Oxide films formed on Alloy 600, Alloy 132, TT 690 and Alloy 600 (20%CW) were analyzed using Auger electron spectroscopy. Arrhenius type temperature dependences were exhibited on all nickel-based alloys between 280 and 360°C. Surface finish conditions also affected the oxide film thickness; thicker oxide formed on ground surfaces than on mirror finished surfaces, which might be explained by the surface damaged layer of the ground surfaces accelerating the oxidation. Even though TT 690 has extremely high SCC resistance, slightly thicker oxide films were observed in comparison with Alloy 600 and Alloy 132. The results indicate that the oxide film thickness is not directly related to the SCC growth rate, implying that other factors have a greater influence on LPSCC.

Keywords: nickel-based alloy, pressurized water reactor, corrosion, oxide film, temperature dependence, stress corrosion cracking
Temperature dependences of the oxide film thickness of nickel-based alloys were examined as a mechanistic study of low potential stress corrosion cracking (LPSCC). Oxide films formed on Alloy 600, Alloy 132, TT 690 and Alloy 600 (20%CW) were analyzed using Auger electron spectroscopy. Arrhenius type temperature dependences were exhibited on all nickel-based alloys between 280 and 360°C. Surface finish conditions also affected the oxide film thickness; thicker oxide formed on ground surfaces than on mirror finished surfaces, which might be explained by the surface damaged layer of the ground surfaces accelerating the oxidation. Even though TT 690 has extremely high SCC resistance, slightly thicker oxide films were observed in comparison with Alloy 600 and Alloy 132. The results indicate that the oxide film thickness is not directly related to the SCC growth rate, implying that other factors have a greater influence on LPSCC.

Keywords: nickel-based alloy, pressurized water reactor, corrosion, oxide film, temperature dependence, stress corrosion cracking
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