水溶液中自组装膜对银的缓蚀作用及吸附机理分析

Anticorrosion Action and Adsorption Mechanism of the Self-Assemble Monolayers

摘要:

采用不同的分散剂将十八烷基硫醇 (ODT)分散在水溶液中，并以其在银表面制备了自组装膜 (SAMs)。用极化曲线、交流阻抗、循环伏安等电化学方法研究了ODT SAMs对银的缓蚀作用及吸附行为。结果表明：ODT分子能够在银表面形成稳定、致密的SAMs，有效抑制了银的阴极氧去极化过程和阳极硫化过程，改变了电极表面的双电层结构，对银有良好的缓蚀作用。ODT在银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

Abstract:

The odtadecanethiol (ODT) was dispersed in aqueous solution with different surfactants, and then self-assembled monilayers (SAMs) were prepared on the surface of silver. The anticorrosion function and adsorption behavior of ODT SAMs on the silve surface was investigated by means of polarization curve, AC impedance and circular voltammetric methods. The results show that ODT is easy to form dense and stable SAMs on the surface of silver. It effectively suppresses silver anodic oxidation process and cathodic reduction process, and changes the surface electric double layer structure of the silver electrode. The results from electrochemical measurement indicate that the corrosion resistance of silver is improved by the ODT SAMs. Adsorption of the ODT SAMs follows the Langmuir’s adsorption isotherm, and the adsorption mechanism is typical chemisorption