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Effects of temperature on SCC propagation in high temperature water injected with hydrogen peroxide

過酸化水素を注入した高温水中でのSCC進展に及ぼす温度の影響

中野 純一; 佐藤 智徳; 加藤 千明; 加治 芳行; 山本 正弘; 塚田 隆

Nakano, Junichi; Sato, Tomonori; Kato, Chiaki; Kaji, Yoshiyuki; Yamamoto, Masahiro; Tsukada, Takashi

過酸化水素(H$$_{2}$$O$$_{2}$$)を含む高温水中でのステンレス鋼の腐食挙動は、O$$_{2}$$のみを含むものと異なることが報告されている。H$$_{2}$$O$$_{2}$$の応力腐食割れ(SCC)に及ぼす影響を評価するため、H$$_{2}$$O$$_{2}$$を注入した高温水中でのSCC進展試験を行った。561K, 100ppb H$$_{2}$$O$$_{2}$$の環境では、粒界型SCC(IGSCC)が、CT試験片のサイドグルーブ近傍の領域に狭い範囲で認められた。しかしながら、453K, 100ppb H$$_{2}$$O$$_{2}$$の環境では、一様にSCCが進展し、CT試験片の板厚全体にIGSCCを示した。H$$_{2}$$O$$_{2}$$の熱分解が減少したため、SCC進展挙動に及ぼすH$$_{2}$$O$$_{2}$$の影響が低温でより強く示された。さらに、き裂内の環境状態を推定するため、CT試験片のき裂に形成した酸化皮膜の外層酸化物を調べ、熱力学平衡計算を行った。

It has been reported that the corrosion behavior of stainless steels in high temperature water with hydrogen peroxide (H$$_{2}$$O$$_{2}$$) was different from those with O$$_{2}$$. To evaluate the effect of H$$_{2}$$O$$_{2}$$ on stress corrosion cracking (SCC), SCC growth tests were conducted in high temperature water injected with H$$_{2}$$O$$_{2}$$. In 100 ppb H$$_{2}$$O$$_{2}$$ at 561 K, an intergranular SCC (IGSCC) was observed only small portion of area near the side grooves of the CT specimen. In 100 ppb H$$_{2}$$O$$_{2}$$ at 453 K, however, IGSCC extended to the central region of the CT specimen. Effects of H$$_{2}$$O$$_{2}$$ on SCC growth behavior appeared stronger at lower temperature due to a reduction of the thermal decomposition of H$$_{2}$$O$$_{2}$$. Moreover, outer oxide layer of oxide film formed on the crack of the CT specimen was examined to estimate environmental situations in the cracks and a thermal equilibrium calculation was performed.

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