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Effects of hydrogen peroxide on SCC behavior of type 304 stainless steel under simulated water radiolysis environment

放射線分解模擬環境下での304ステンレス鋼のSCC挙動に及ぼす過酸化水素の影響

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

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

ステンレス鋼の応力腐食割れ(SCC)挙動へ及ぼす過酸化水素(H$$_{2}$$O$$_{2}$$)の影響を評価するために、H$$_{2}$$O$$_{2}$$を注入した高温水中でのき裂進展試験及びその場電気化学的インピーダンス測定(EIS)を行った。561K, 100ppb H$$_{2}$$O$$_{2}$$中で試験したコンパクトテンション(CT)試験片の破面上では、粒界型SCC(IGSCC)がCT試験片のサイドグルーブ近傍にのみ観察された。H$$_{2}$$O$$_{2}$$の残存量を増やすため、CT試験片からシェブロンノッチ部を除去した。その結果、CT試験片の中央部までIGSCCが拡大した。ステンレス鋼の隙間付腐食試験片に対して行ったEISから得られた電荷移動抵抗を用いて、隙間内側のH$$_{2}$$O$$_{2}$$の残存率を微分方程式の計算コードにより計算した。シェブロンノッチ無のCT試験片でのH$$_{2}$$O$$_{2}$$の残存率がシェブロンノッチ有のそれよりも高いという計算結果を得た。

To evaluate the effects of hydrogen peroxide (H$$_{2}$$O$$_{2}$$) on stress corrosion cracking (SCC) behavior of stainless steels (SSs), crack growth tests and in-situ electrochemical impedance spectroscopy (EIS) in high temperature water injected with H$$_{2}$$O$$_{2}$$ were carried out. On the fracture surface of a compact tension (CT) specimen exposed 100 ppb H$$_{2}$$O$$_{2}$$ at 561 K, intergranular SCC (IGSCC) was observed only near side grooves of the CT specimen. To increase the amount of remaining H$$_{2}$$O$$_{2}$$, Chevron notches were eliminated from a CT specimen. Consequently expansion of IGSCC area was observed into the central region of the CT specimen. EIS was conducted on SS creviced corrosion specimens. Using the obtained charge transfer resistance, ratio of remaining H$$_{2}$$O$$_{2}$$ inside crevice was calculated with a differential equation code. Ratio of remaining H$$_{2}$$O$$_{2}$$ in the CT specimen without Chevron notches was calculated as higher than that of the one with Chevron notches.

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