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Effects of alloy composition and flow condition on the flow accelerated corrosion in neutral water condition

中性純水中での炭素鋼の流れ加速型腐食に及ぼす添加元素及び流速条件の影響

佐藤 智徳; 宇賀地 弘和; 塚田 隆; 内田 俊介

Sato, Tomonori; Ugachi, Hirokazu; Tsukada, Takashi; Uchida, Shunsuke

流れ加速型腐食(FAC)は炭素鋼の表面酸化被膜の溶出が、高い表面流速により加速される現象である。本研究では、チューブ型の炭素鋼試験片によるFAC速度のその場測定により、150$$^{circ}$$C中性純水中でのFACにおける炭素鋼の合金元素の影響を評価した。結果は以下のとおりである。(1)炭素鋼標準材でのFAC速度は流速の1.2乗に依存した。(2)FACは0.03%以上Crを含む炭素鋼では測定下限以下まで低減された。(3)0.1%Niを含む炭素鋼ではFACの低減が確認された。(4)NiによるFAC低減効果と、Crによる低減効果の違いを表面被膜の化学組成分析により確認した。(5)CuのFACへの影響は確認されなかった。また、流速がFAC速度に与える影響についての試験結果も報告する。

The major mechanism of Flow accelerated corrosion (FAC) is the dissolution of the protective oxide on carbon steel, which is enhanced by mass transfer and erosion under high flow velocity conditions. In this study, the effects of alloy composition and flow velocity on FAC of carbon steel were evaluated by measuring FAC rate of tube type carbon steel specimens in the neutral water condition at 150$$^{circ}$$C. Obtained results are summarized in follows. (1) High FAC rate was depended upon the v$$^{1.2}$$ in the tube type specimen made of the standard alloy. (2) FAC was mitigated for the carbon steel with more than 0.03% of Cr content. (3) FAC rate decreased as Ni content increased in more than 0.1% of Ni content. (4) The difference in chemical composition of oxide film between Ni added carbon steel and Cr added one was confirmed. The hematite rich oxide was observed for Ni added carbon steel. (5) The effects of Cu on FAC rate was not observed up to 0.1% of Cu content.

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