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Corrosion inhibition effects of metal cations on SUS304 in 0.5 M Cl$$^{-}$$ aqueous solution

0.5M Cl$$^{-}$$溶液中のSUS304への金属カチオンの腐食抑制効果

Islam, M. S.*; 大谷 恭平  ; 坂入 正敏*

Islam, M. S.*; Otani, Kyohei; Sakairi, Masatoshi*

異なる金属カチオンを含む0.5M Cl$$^{-}$$の溶液に暴露したSUS304の腐食挙動を表面分析を伴う浸漬試験および電気化学測定により調査した。金属カチオンにより異なる腐食メカニズムはXPS分析および硬い柔らかい酸塩基理論(HSAB理論)により解明した。研究結果より、硬い金属カチオンは化学結合によって不動態皮膜上に保護層を形成して塩化物イオンによる攻撃を防ぐことにより、SUS304の腐食反応を抑制する効果を持つと考えられる。

The corrosion characteristics of SUS304 exposed to 0.5M Cl$$^{-}$$ aqueous solution containing different metal cations were studied with immersion tests, surface analysis and electrochemical tests. The mechanism of corrosion with metal cations was clarified by the XPS analysis results together with the hard and soft acid and base (HSAB) concept and the passive films structure. It is supposed that metal cations with large hardness make a layer by chemical bonding with the passive films. The passive films are protected by the metal cation layer from Cl$$^{-}$$ attack, and consequently corrosion reactions are inhibited.

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パーセンタイル:49.28

分野:Materials Science, Multidisciplinary

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