The aim of this study is to develop nanometer‐thin epoxy‐based films on aluminium alloy AA2024‐T3 as a model coating system for high resolution corrosion studies. Spin coating was used for the layer‐by‐layer (LbL) deposition of poly‐(ethylenimine) (PEI) and poly([o‐cresyl glycidyl ether]‐co‐formaldehyde) (CNER) bilayers. The film chemistry and the cross‐linking process were characterized by means of Fourier‐transform infrared spectroscopy (FTIR). Ellipsometric data confirmed the linear increase of film thickness. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) results indicate the improvement of the film barrier properties with increasing film thickness. Mapping of the topography and the volta potential was performed by means of scanning Kelvin probe force microscopy (SKPFM). The results indicate the presence of a homogeneous film structure, while the intermetallic phases can still be identified below the coating. The SKPFM analysis confirmed that the model films are suitable for investigation of corrosion processes at the coating/metal interface.

中文翻译：

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在AA2024-T3铝合金上逐层组装的薄涂层的开发，用于高分辨率的局部腐蚀过程研究

这项研究的目的是在AA2024-T3铝合金上开发纳米薄的环氧基薄膜，作为用于高分辨率腐蚀研究的模型涂层系统。旋涂用于聚（乙烯亚胺）（PEI）和聚（[邻甲苯基缩水甘油醚]-甲醛）（CNER）双层的逐层（LbL）沉积。通过傅立叶变换红外光谱（FTIR）表征了膜的化学性质和交联过程。椭偏数据证实了膜厚度的线性增加。电位动力学极化和电化学阻抗谱（EIS）结果表明，随着膜厚度的增加，膜阻隔性能得到改善。通过扫描开尔文探针力显微镜（SKPFM）来进行形貌和伏特电位的映射。结果表明存在均匀的膜结构，而金属间相仍可以在涂层下方被识别。SKPFM分析证实，该模型膜适用于研究涂层/金属界面的腐蚀过程。