从 Nyquist 图的结果中，对于浸入 3 d 内的样品，在低频区域观察到 Warburg 阻抗特性（图 14a）。 之后，Warburg 阻抗特性消失。 电容环的直径在浸入 1 d 内增加，然后在浸入 3-7 d 期间减小，并在 7 d 后再次增加，这与阻抗模量 |Z| 表现出相同的趋势。 在最低频率（图 14c）。 波德图显示纯锌浸泡不同时间后在中低频区域有两个重叠的时间常数。

From the results of Nyquist plots, a Warburg impedance character is observed in the low frequency region for the samples immersed within 3 d (Fig. 14a). After that, the Warburg impedance character disappears. The diameters of capacitive loop show an increase within 1 d immersion, then decrease during the immersion for 3–7 d and increase again after 7 d, which shows the same trend as the impedance modulus, |Z| at the lowest frequency (Fig. 14c). The Bode plots show that there are two overlapped time-constants in medium and low frequency regions for pure Zn after immersion for different times.