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Abstract：
Electrochemical impedance spectroscopy (EIS) is a modern and efficient method for the evaluation of the protective abilities of coatings. However, the interpretation of the experimental data is a difficult task. This paper aims to investigate the effect of the addition of a nano clay, Cloesite 30B®, on the barrier properties of an epoxy-based system through electrochemical impedance spectroscopy in an aerated sodium chloride solution. The EIS spectra of the samples analysed showed different evolutions over time. The subsequent processing of spectra using equivalent electrical circuits is an excellent analytical tool and allows the protective capacity of coatings to be assessed. By using this analysis, it was possible to define and comprehend the impact of adding nano clay in different concentrations to the epoxy resin coating. The work has shown the effectiveness of increasing the barrier effect of the coating with this type of nano clay. However, the improvement is linked to obtaining a correct dispersion of nanoparticles. Otherwise, there is the formation of macro-clusters of particles inside the coating. Their appearance can cause a deterioration in coating performance.
摘要：
电化学阻抗谱（EIS）是一种用于评估涂层保护能力的现代有效方法。然而,实验数据的解释是一项艰巨的任务。本文旨在研究纳米粘土的添加效果,Cloesite30B®，在充气氯化钠溶液中通过电化学阻抗谱研究环氧基体系的阻隔性能。分析的样品的EIS光谱显示随时间的不同演变。使用等效电路对光谱进行后续处理是一种出色的分析工具，可以评估涂层的保护能力。通过分析，可以定义和理解在环氧树脂涂料中添加不同浓度的纳米粘土的影响。这项工作表明，这种类型的纳米粘土增加涂层的阻隔效果的有效性。然而,这种改进与获得纳米粒子的正确分散有关。否则,在涂层内部形成颗粒的宏观团簇。它们的外观可导致涂层性能的劣化。
