利用电化学交流阻抗方法研究了防锈颜料红丹(Pb_3O_4)在环氧涂层中的作用。通过对涂层交流阻抗图谱解析,提出其特征等效电路,并探讨Pb_3O_4在涂层中的作用机理。实验表明Pb_3O_4是一种典型的钝化型防锈颜料,浸泡初期以钝化作用为主,后期则以皂化作用为主。
EIS investigation of epoxy coating containing anti-rust pigment Pb3O4 was made. On the basis of various specific equivalent circuits for the coating, the performance mechanism of Pb3O4 in the organic coating was discussed. The EIS results showed that Pb3O4 was a typical passive pigment. At the initial stage of immersion , Pb3O4 dissolved and then diffused towards the metal/coating interface. It resulted in the formation of passive film and anodic dissolution of the metal was inhibited. Later the passive film might be destroyed and a saponification film could form. At that time the corrosion rate determining step was changed from metal dissolution control to oxygen definite-layer diffusion control.
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