Zn-Fe-SiO2复合电沉积过程的控制步骤  

Control Steps of Electrodeposition of Zn-Fe-SiO_2 Composite Coating

作　　者：范云鹰[1] 张英杰[1] 董鹏[1] 罗少林[1] 闫磊[1] 屠振密[2] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093 [2]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《材料保护》2008年第3期1-3,共3页Materials Protection

基　　金：教育部高等学校博士学科点专项科研基金项目(20050674007)

摘　　要：为了加强金属基复合材料电沉积制备技术的基础理论研究,分别考察了硫酸盐和氯化物两种体系镀液中SiO2微粒浓度对镀层成分的影响,以研究Zn-Fe-SiO2复合材料电沉积过程的控制步骤。结果表明:Zn-Fe-SiO2复合电沉积过程存在两步吸附过程,随着镀液中微粒浓度的不断增加,将逐渐由弱吸附控制转为强吸附控制,控制步骤发生转换所对应的临界微粒浓度也不固定,硫酸盐体系为10g/L,氯化物体系为4g/L;由于流体力学因素的作用,弱吸附控制阶段并不符合Guglielmi模型;工艺优化时应针对具体的控制步骤采取不同的措施。With a view to the basic theoretical research of the electrodeposition of metal-based composite coatings, the effect of the concentration of SiO2 particulates in suifate and chloride-plating baths on the composition of electrodeposited Zn-Fe-SiO2 composite coating was studied, and the control steps for the electrodeposition of the composite coating were analyzed. Results showed that the electrodeposition of the Zn-Fe-SiO2 composite coating was dominated by two-step adsorption, the weak adsorption and strong adsorption of the SiO2 particulates. With increasing concentration of SiO2 particulates in the plating baths, the weak adsorption of the SiO2 particulates on the cathode would change to strong adsorption at a certain high enough concentration of the SiO2 particulates. At the same time, different plating baths had different critical concentrations of SiO2 particulates for the weak adsorption to transfer to strong adsorption. Namely, the critical concentration of SiO2 particulates in sulfate plating bath was 10 g/L, while it was 4 g/L in chloride plating bath. In addition, Guglielmi model was not applicable to the electrodeposition of Zn-Fe-SiO2 composite coating dominated by weak adsorption, due to hydromechanical effect. Thus it was feasible to determine the optimized technics for the electrodeposition of the Zn- Fe-SiO2 composite coating with respect to different control steps.

关 键 词：复合电沉积 Zn-Fe-SiO2复合材料 控制步骤 两步吸附 

分 类 号：TQ153.1[化学工程—电化学工业]