针对粘合剂种类、Zn粒形状和涂层厚度的协同作用, 采用电化学阻抗谱(EIS)研究了富Zn涂层在3.5% NaCl溶液中的电化学行为。富Zn涂层的EIS谱有两个时间常数, 其中，锌的电子转移反应发生在低频段, 而高频段则体现聚合物和Zn表面氧化层的介电性质。根据等效电路及其元件参数解释了钢铁/富Zn涂层盐水体系的EIS测量结果。实验结果表明, 鳞片锌消耗速度太快以至于鳞片富Zn涂层在相对较短的时间内就失去了阴极保护作用, 随后形成了稍微致密的屏蔽阻挡层。
Electrochemical impedance spectroscopy (EIS) was used to study the influences of the binder, pigment shape and the coating thickness on the corrosion prevention performance of the zinc--rich coatings (ZRC). There are two time constants for these coatings, the first one is attributed to the contact impedances between the different zinc particles and the second one is related to the charge transfer resistance of the Zn dissolution process. Furthermore, the EIS data of ZRC were interpreted according to equivalent circuit models. The corresponding parameters were derived to assess the coating deterioration with time and the performance between zinc dust primers and zinc flake primers were compared. The results showed that the zinc flake reduced the cathodic protection period of the ZRC and rapidly produced a little compact barrier.
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