铜表面吡咯烷二硫代氨基甲酸铵自组装膜的拉曼光谱和缓蚀作用

来源期刊:中国有色金属学报2010年第11期

论文作者:岳忠文 廖强强 王作华 李义久 陈亚琼 葛红花

文章页码:2213 - 2220

关键词:铜; 吡咯烷二硫代氨基甲酸铵; 拉曼光谱; 自组装单分子膜; 缓蚀; 吸附

Key words:copper; ammonium pyrrolidine dithiocarbamate; Raman spectrum; self-assembled monolayer; corrosion inhibition; adsorption

摘    要:应用表面增强拉曼光谱(SERS)和电化学方法,对铜电极表面吡咯烷二硫代氨基甲酸铵(APDTC) 的自组装单层结构、缓蚀性能和吸附行为进行研究。 SERS光谱表明:APDTC分子通过硫原子垂直吸附在铜表面形成APDTC自组装单分子膜(APDTC SAMs)。交流阻抗和极化曲线实验表明:在3%NaCl(质量分数)溶液中APDTC SAMs对铜具有很好的缓蚀作用,最高缓蚀效率可达98%; APDTC的吸附行为符合Langmuir 吸附等温式, 吸附机理是介于化学吸附和物理吸附之间的一种吸附。

Abstract: The structure, corrosion inhibition and adsorption behavior of ammonium pyrrolidine dithiocarbamate (APDTC) self-assembled monolayers (SAMs) on a copper surface were investigated by surface-enhanced Raman scattering spectroscopy (SERS) and electrochemical methods. The results of SERS experiment show that APDTC SAMs is adsorbed on the copper surface by its S atoms with perpendicular orientation. The AC impedance and DC polarization results indicate that APDTC SAMs have good corrosion inhibition effects on copper in a 3% NaCl solution and its maximum inhibition efficiency can reach 98%. Adsorption of the APDTC SAMs is found to follow the Langmuir′s adsorption isotherm and the mechanism consists of a mixed adsorption between chemisorption and physisorption.

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