十八硫醇自组装膜对青铜的缓蚀作用

杜 伟¹，李佳佳¹，万 俐² ，陈步荣¹，丁 毅¹

(1. 南京工业大学 材料科学与工程学院，南京 210009；2. 南京博物院 文物保护研究所，南京 210016)

摘 要：在乙醇体系中采用十八硫醇(ODT)在青铜表面制备自组装膜(SAMs)，采用循环伏安法、极化曲线和交流阻抗谱等电化学方法研究该膜在0.5 mol/L NaCl溶液中对青铜电极的缓蚀性能。结果表明：ODT在青铜表面形成了SAMs，能够有效抑制青铜的腐蚀。随着成膜温度和ODT浓度的增高，ODT自组装膜的缓蚀效率和覆盖度提高。当ODT浓度为0.1 mol/L、成膜温度为60 ℃时，缓蚀效率为98.1%，覆盖度为98.7%；十八硫醇在青铜表面的吸附行为符合Langmuir吸附等温式，吸附机理是典型的化学吸附。

关键词：十八硫醇；青铜；自组装膜；缓蚀；吸附

Corrosion inhibition of bronze by self-assembled monolayers of octadecanethiol

DU Wei¹, LI Jia-jia¹, WAN Li², CHEN Bu-rong¹, DING Yi¹

(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