拉曼光谱和缓蚀作用
(1. 上海电力学院 上海高校电力腐蚀控制与应用电化学重点实验室, 上海 200090；
2. 上海电力学院 上海热交换系统节能工程技术研究中心, 上海 200090;
3. 同济大学 化学系，上海 200092)
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。
关键字: 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
（1. Key Laboratory of Shanghai Colleges and Universities for Electric Power Corrosion Control and
Applied Electrochemistry, Shanghai University of Electric Power, Shanghai 200090, China;
2. Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems,
Shanghai University of Electric Power, Shanghai 200090, China;
3. Department of Chemistry, Tongji University, Shanghai 200092, China）
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.
Key words: copper; ammonium pyrrolidine dithiocarbamate; Raman spectrum; self-assembled monolayer; corrosion inhibition; adsorption
