应用电化学阻抗谱(EIS)技术以单槽和串联双槽两种方式测量了同一环氧涂层金属样品5个测试点在浸泡过程中阻抗行为的变化. 通过两种测试方式中涂层金属体系各测量点的极化电阻Rp(Rp=Rc+Rct+Rdiff)间的关联性, 说明了涂层金属的EIS双槽检测技术的可靠性. 实验结果表明: 同一样品两个测试点的阻抗差别较大时, 采用串联双槽测量的总阻抗值与其中的高阻抗测试点的阻抗值更为接近, 两个测试点单槽测量的Rp(Rc+Rct+Rdiff)之和(∑Rpi)与双槽测量的Rp间存在较大偏差;阻抗相近的两个测试点进行串联测量时, Rp近似等于两点分别以单槽方法所得Rp之和(∑Rpi); 两个测试点的阻抗均较小时, 串联后测得的Rp与两点单独测量的Rp之和间存在较大偏差.
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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