(1. 南京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，南京 210009；2. 南京博物院 文物保護研究所，南京 210016)
摘 要: 在乙醇體系中采用十八硫醇(ODT)在青銅表面制備自組裝膜(SAMs)，采用循環(huán)伏安法、極化曲線和交流阻抗譜等電化學(xué)方法研究該膜在0.5 mol/L NaCl溶液中對青銅電極的緩蝕性能。結(jié)果表明：ODT在青銅表面形成了SAMs，能夠有效抑制青銅的腐蝕。隨著成膜溫度和ODT濃度的增高，ODT自組裝膜的緩蝕效率和覆蓋度提高。當(dāng)ODT濃度為0.1 mol/L、成膜溫度為60 ℃時，緩蝕效率為98.1%，覆蓋度為98.7%；十八硫醇在青銅表面的吸附行為符合Langmuir吸附等溫式，吸附機理是典型的化學(xué)吸附。
關(guān)鍵字: 十八硫醇；青銅；自組裝膜；緩蝕；吸附
（1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;
2. Research Institute of Cultural Conservation, Nanjing Museum, Nanjing 210016, China）
Abstract:The self-assembled monolayers (SAMs) were prepared on bronze surface in ethanol solution using octadecanethiol (ODT). The effect of the membrane on the corrosion inhibition of bronze electrode in 0.5 mol/L NaCl solution was investigated by using cyclic voltammetry (CV), polarization curve, and electrochemical impedance spectroscopy (EIS). The results show that the ODT can be assembled on the surface of bronze electrode to form monomolecular SAMs, which can prevent effectively the corrosion of bronze. The higher the concentration of ODT and temperature are, the more excellent the inhibition efficiency and the denser the coverage degree are. When the concentration of ODT is 0.1 mol/L and temperature is 60 ℃, the inhibition efficiency reaches 98.1% and the coverage degree reaches 98.7%. The adsorption of ODT SAMs follows the Langmuir’s adsorption isotherm formula, and the adsorption mechanism is of typical chemical adsorption.
Key words: octadecanethiol; bronze; self-assembly monolayer; anticorrosion; adsorption
