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金属学报 2005

锌粒形态对富Zn涂层在3.5%NaCl溶液中电化学行为的影响

, PP. 769-774

谢德明,童少平,冯海,张鉴清

Keywords: 富Zn漆,鳞片Zn粉,球形Zn粉

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Abstract:

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。

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