【作者】 范云鹰； 张英杰； 杨显万； 陈阵； 章江洪； 屠振密；

【Author】 Fan Yunymg~(1*), Zhang Yingjie~1, Yang Xianwan~1, Chen Zhen~1 Zhang Jianghong~1 Tu Zhenmi~2 (1.Kunming University of Science and Technology, Kunming 650093, China; 2.Harbin Institute of Technology, Harbin 150001, China)

【机构】 昆明理工大学； 哈尔滨工业大学；

【摘要】 在酸性硫酸盐体系中电沉积制备了Zn-Fe-SiO₂复合镀层,并研究了工艺因素对镀层SiO₂含量的影响。随着电流密度由4.8A/dm²增加到6A/dm²时,镀层中SiO₂的含量由0.21%上升到0.47%,但是当电流密度继续增加到7.2A/dm²时,SiO₂含量反而下降到了0.18%。当镀液中SiO₂浓度由20g/L增加到60g/L时,镀层中SiO₂含量由0.40%上升到0.51%。当镀液pH值由2增加到4时,镀层中SiO₂含量由0.22%上升到1.17%。采用5%NaCl溶液浸泡试验考察了Zn镀层、Zn-Fe合金镀层与Zn-Fe-SiO₂复合镀层的耐蚀性,并研究了镀层中SiO₂含量对镀层耐蚀性的影响。结果表明,Zn-Fe-SiO₂复合镀层无需钝化处理,其耐蚀性优于Zn镀层及Zn-Fe合金镀层,并且镀层的耐蚀性随着镀层中SiO₂含量增大而提高。更多还原

【Abstract】 The Zn-Fe-SiO₂ composite coating was electrodeposited from acidic sulphate bath, and the technics’ influence on the content of SiO₂ in coating was studied. As the current density was increased from 4.8A/dm² to 6A/dm², the content of SiO₂ increased from 0.21% to 0.47% simultaneously, while as current density was increased to 7.2A/dm² continuously, the content of SiO₂ decreased to 0.18% instead. As the concentration of SiO₂ particle in the bath was increased from 20g/L to 60g/L, the content of SiO₂ in coating increased from 0.40% to 0.51%. As the value ofpH was increased from 2 to 4, the content of SiO₂ increased from 0.22% to 1.17%. The corrosion resistance of Zn, Zn-Fe alloy and Zn-Fe-SiO₂ composite coating was studied by dipping them into 5%NaC1 solution. The relationship between the corrosion resistance of Zn-Fe-SiO₂ composite coating and the content of SiO₂ was studied. The results showed that Zn-Fe-SiO₂ composite coating without passivation has higher corrosion resistance than Zn nd Zn-Fe alloy coating, and the corrosion resistance of Zn-Fe-SiO₂ composite coating can be improved by increasing the content of SiO₂.更多还原