苯并三氮唑对铜和铁缓蚀作用的拉曼光谱研究

本文利用现场拉曼光谱研究了中性含氯离子溶液中苯并三氮唑在铜和铁电极表面的吸附以及成膜行为，结果表明苯并三氮唑能强烈地化学吸附于铜电极和铁电极表面，形成类似［Ｍｎ（ＢＴＡ）ｐ］的配合物膜，一定程度上阻止了膜内外物质的交换，对金属起缓蚀作用。另一方面两种金属表面配合物膜均具有电位依赖性：在铜电极表面，当外加电位由－０．５Ｖ负移至－０．９Ｖ时，发生了由［Ｃｕ（Ⅰ）（ＢＴＡ）］ｎ向［Ｃｕ（Ⅰ）Ｃｌ（ＢＴＡＨ）］４的转变；而在铁电极表面当外加电位由－０．６Ｖ负移至－１．２Ｖ时，最初形成的表面配合物［Ｆｅｎ（ＢＴＡ）ｐ］则很可能转变成类似于［Ｆｅｎ（Ｃｌ）ｐ（ＢＴＡＨ）ｍ］的配合物，从而使得ＢＴＡＨ对铜、铁的缓蚀能力均有所下降。

Surface Raman Spectroscopic Studies of Benzotriazole on Copper and Iron Electrodes *

The corrosion inhibition behaviour of benzotriazole (BTAH) on copper and iron in 0 1 M KCl has been investigated by Raman spectroscopy It has been shown that BTAH is chemisorbed on the iron or copper surfaces due to the formation of Fe N or Cu N coordinated bonds in neutural chloride solutions, therefore the compact film which is probably composed of M n(BTA) p] inhibits efficiently the anodic dissolution of the metal electrodes Moreover, the composition of the surface film is changeable upon the various applied potential Specifically, for BTAH on copper, the initially formed complex Cu(Ⅰ)(BTA)] nis transformed to Cu(Ⅰ)Cl(BTAH)] 4while the applied potential is switched less noblely from -0 5 V to -0 9 V While on the iron electrode, it is possible that the initially formed complex is transformed to Fe n(Cl) p(BTAH) m] as the negatively going potential is changed from -0 6 V to -1 2 V Thus, the more negative potentiol, the ability of BTAH to inhibit corrosion is lowered