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Citation: Sun Qiu-Xia, Zhang Jian-Qing, Lin Chang-Jian. Quantitatively Predicate State of Adhesion between Coating/Metal Interface by EIS Measurements[J]. Acta Physico-Chimica Sinica, ;2004, 20(11): 1297-1302. doi: 10.3866/PKU.WHXB20041103 shu

Quantitatively Predicate State of Adhesion between Coating/Metal Interface by EIS Measurements

1.
Department of Chemistry, Zhejiang University, Hangzhou　310027; State Key Laboratory for Corrosion and Protection of Metal, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang　110016; State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen　361005

Received Date: 8 March 2004
Available Online: 15 November 2004

According to the experimental results and the basic concept that the capacitive contribution of the coating/metal system to EIS can reflect the change occurring at interface sensitively, the quantitative relationship between the adhesion and the analytical result of EIS is established. The approach is using the transmission line model (CR circuit) to obtain the discrete capacitance values, analyzing the physical meaning of the slope at the region in which the discrete capacitances change linearly with the discrete characteristic frequency. The data handling method is also given in detail. The relationship is validated by experiments. The results show that under certain conditions, the slopes are mainly determined by the speed of instantaneous delamination at organic coating/metal interface and are not influenced by the corrosion product built up at the artificial defect, so they have od reproducibility despite the EIS of duplicate samples showing very different configuration. The analytical results from EIS are often higher than that of mechanical measurements when adhesion is strong. Explanation of the discrepancy shows that the results from EIS are more accurate and reasonable. In regard to epoxy powder paints and A3 steel, the results also indicate that the pretreatment of substrate using silane with and without hot-dip galvanized or phosphate treatment can influence markedly the adhesion between substrate and coating.
- Electrochemical impedance spectroscopy(EIS);　Transmission line,　Interfacial adhesion;　Organic coating;　A3 steel
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