采用在机械镀锌过程添加纳米TiO2颗粒制备了机械镀锌层,采用SEM、XRD分析了镀层的组织结构,测试了镀层的致密度,采用中性盐雾试验测试了镀层的耐腐蚀性能。结果表明,添加TiO2纳米颗粒不影响镀层的基本结构,镀层中没有发现含Ti新相产生;SEM分析发现,纳米TiO2颗粒在镀层中呈白色点状分布于锌粉颗粒表面,但镀层中没有发现TiO2明显的XRD特征峰。添加3%和5%纳米TiO2后,镀层的致密度由70.86%分别增至84.26%、88.63%,并延长了镀层耐盐腐蚀出现红锈的时间。
Zinc coatings were mechanically deposited from the electrolyte solution containing nano-TiO2 particles.Microstructure of the coatings was studied by means of scanning electron microscopy(SEM),energy-dispersive X-ray spectrosmeter(EDS)and X-ray diffraction(XRD).The density of the coatings was measured and the corrosion resistance of coatings was studied by neutral salt spraying test(NSS).The results show that the additions of nano-TiO2 particles have no influence on structure of the coatings.The nano-TiO2 particles located at the surface of zinc particles in the coatings.No new phase contained titanium is detected in the coating and no distinct diffraction peaks of TiO2 are observed in XRD test.At the same time,the relative density of the coatings increases from 70.86% to 84.26%,88.63% with TiO2 from zero to 3%,5%,respectively.The additions of nano-TiO2 particles in the coatings increases the hours for the formation of red rust in salt spraying test.
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