测定了316不锈钢在模拟冷却水中长期浸泡（1~65d）和短期浸泡（1h内）过程中的电化学阻抗谱，并用4种钝化模型进行了拟合，确定了适合本体系的钝化模型。拟合结果显示，在长期浸泡过程中，浸泡初期电荷转移电阻R1较小，而反映双电层电容的Y01值较大，随浸泡时间增加，R1、Y01值趋于稳定；膜电阻R2在电极浸泡过程中不断增大，膜电容Y02值则不断减小，显示钝化膜的增厚和致密；8d后R2比R1约大4个数量级。短期浸泡过程中，浸泡5min时，R1与R2数值接近；随浸泡时间延长，R1变化不大，而R2在15min内增大了一个数量级，并不断随时间延长而增大。
The electrochemical impedance spectroscopy for stainless steel in simulated cooling water during long time immersion (1~65 days) and short time immersion (in one hour) are measured. The data are fitted using four models, and a suitable model is selected. The fitting results appear that, during the long time immersion period, the charge-transfer resistance R1 is relatively small and the double layer capacity Y01 is relatively large at the beginning of the immersion. When the immersion time increases, the values of R1 and Y01 stabilize. The film resistance R2 increases while the value of Y02 decreases continuously with the immersion, indicating that the passive film is getting thicker and more compact. The value of R2 is about four orders larger than R1 after 8 days' immersion. During the short time immersion period, R1 is close to R2 at 5 min; R1 changes little with time, but R2 increases by one order at 15 min and rises continuously with the immersion.
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