Fast evaluation of Degradation Degree of Organic Coatings by Analyzing EIS Data.pdf

Fast evaluation of Degradation Degree of Organic Coatings by Analyzing EIS Data.pdf

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Fast evaluation of Degradation Degree of Organic Coatings by Analyzing EIS Data

Trans. Tianjin Univ. 2012, 18: 015-020 DOI 10.1007/s12209-012-1752-3 Fast Evaluation of Degradation Degree of Organic Coatings by Analyzing Electrochemical Impedance * Spectroscopy Data XIA Dahai (夏大海),SONG Shizhe (宋诗哲),WANG Jihui (王吉会), BI Huichao (毕慧超),HAN Zhewen (韩哲文) (School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China) © Tianjin University and Springer-Verlag Berlin Heidelberg 2012 Abstract :The degradation coefficient is proposed to evaluate the degradation degree of organic coatings by directly analyzing the Bode plots of the electrochemical impedance spectroscopy (EIS) data. This paper investigated the deg- radation of phenolic epoxy coating/tinplate system by EIS and the degradation coefficient value, which correlates well with the results of breakpoint frequency and variation of phase angle at 10 Hz. Furthermore, the degradation process was confirmed by scanning electron microscope (SEM) and scanning probe microscopy (SPM). It is concluded that degradation coefficient can be used for the fast evaluation of degradation degree of organic coatings in practical appli- cations. Keywords :degradation process; electrochemical impedance spectroscopy; fast evaluation; organic coating The electrochemical impedance spectroscopy (EIS) extracting the characteristic parameters directly from EIS has been widely used in the investigation of the degrada- data has a certain theoretical and applicable value. Isao et tion degree of polymer coated me

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