拉曼光譜和緩蝕作用
(1. 上海電力學(xué)院 上海高校電力腐蝕控制與應(yīng)用電化學(xué)重點(diǎn)實(shí)驗(yàn)室, 上海 200090；
2. 上海電力學(xué)院 上海熱交換系統(tǒng)節(jié)能工程技術(shù)研究中心, 上海 200090;
3. 同濟(jì)大學(xué) 化學(xué)系，上海 200092)
摘 要: 應(yīng)用表面增強(qiáng)拉曼光譜(SERS)和電化學(xué)方法，對銅電極表面吡咯烷二硫代氨基甲酸銨(APDTC) 的自組裝單層結(jié)構(gòu)、緩蝕性能和吸附行為進(jìn)行研究。 SERS光譜表明：APDTC分子通過硫原子垂直吸附在銅表面形成APDTC自組裝單分子膜(APDTC SAMs)。交流阻抗和極化曲線實(shí)驗(yàn)表明：在3%NaCl(質(zhì)量分?jǐn)?shù))溶液中APDTC SAMs對銅具有很好的緩蝕作用，最高緩蝕效率可達(dá)98%; APDTC的吸附行為符合Langmuir 吸附等溫式, 吸附機(jī)理是介于化學(xué)吸附和物理吸附之間的一種吸附。
關(guān)鍵字: 銅; 吡咯烷二硫代氨基甲酸銨; 拉曼光譜; 自組裝單分子膜; 緩蝕; 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
