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用纳米复合电沉积技术在低碳钢表面制备了Zn-Co-TiO_2纳米复合镀层。用SEM、EDS和XRD等技术手段对样品进行了分析与表征。结果表明,镀层中Ti02的含量约为12.63%,并均匀分散在镀层中,可以起到细化Zn-Co合金镀层晶粒的作用,并使Zn-Co合金镀层的耐蚀性能得到提高。用紫外光辅助照射电极电位监测方法研究Zn-Co-TiO_2纳米复合镀层光生阴极保护特性。结果表明,在紫外光照射下,镀层的电极电位负移,说明镀层具有光生阴极保护性能;关闭紫外光灯后,其电极电位正移,但仍低于镀层未光照前的电极电位。在400℃下氧化6 h后镀层表面生成了ZnO薄膜,其与TiO_2的协同作用可进一步提高镀层的光生阴极保护性能。
Zn-Co-TiO 2 nanocomposite coatings were prepared on the surface of mild steel by nanocomposite electrodeposition. The samples were analyzed and characterized by SEM, EDS and XRD. The results show that the content of Ti02 in the coating is about 12.63%, and uniformly dispersed in the coating, which can refine the grain of the Zn-Co alloy coating and improve the corrosion resistance of the Zn-Co alloy coating. Study on Photoprotective Cathode Protection of Zn-Co-TiO 2 Nanocomposite Coatings by Ultraviolet Light-Assisted Electrode Potential Monitoring. The results showed that under the irradiation of UV light, the potential of the coating negatively shifted, indicating that the coating has a photo-cathodic protection performance; when the UV lamp is switched off, the potential of the electrode is positive but still lower than that of the electrode before the coating is unirradiated. After being oxidized at 400 ℃ for 6 h, the ZnO thin film was formed on the surface of the coating. The synergistic effect with TiO 2 could further improve the photocathode cathodic protection.