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| The analysis of EIS for serial double-cell of epoxy coated mild steels |
| JinTao Zhang |
| 常州工学院理学院 |
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Cite this article:
JinTao Zhang. The analysis of EIS for serial double-cell of epoxy coated mild steels. Acta Metall Sin, 2006, 42(8): 857-860 .
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Abstract The single-cell and serial double-cell impedance measurements of five points on the same epoxy coating covered mild steel were performed by electrochemical impedance spectroscopy (EIS) technique. The reliability of double-cell method was demonstrated by the relationship between polarization resistance values (Rp, where Rp=Rc+Rct+Rdiff) of organic coated-metal systems with single-cell and double-cell measuring methods, respectively. The experimental results suggested that when the impedance difference of two epoxy coated-mild steel electrodes selected in the double-cell was large, the value of impedance of epoxy covered metal system with double-cell was close to that of the electrode with higher impedance, and the relative error between the sum of Rp of single-cells and Rp of double-cell was larger; for two electrodes with similar impedance values were in series, the Rp of double-cell was equal to the sum of Rp of two single-cells, and the relative error of these results was smaller; both impedance values of two electrodes were small and they were in series, one could find that Rp of double-cell was not the same as the sum of Rp of two single systems and there was larger relative error between these results.
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Received: 30 November 2005
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