Fe-Ni合金电沉积的电化学行为  

Electrochemical behaviors of electrodeposited Fe-Ni alloy

作　　者：陈志凯[1] 郭红霞[1] 王群[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《功能材料》2010年第9期1595-1599,共5页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA06Z320)

摘　　要：利用线性扫描法和循环伏安法分别讨论了镀液中Fe2+和Ni2+浓度、pH值、温度、光亮剂、配位剂含量对Fe-Ni合金电沉积的电化学行为的影响。结果表明,镀液的pH值降低,温度升高时,Fe-Ni合金共沉积的阴极极化减小,镀液中Fe2+浓度增加,Ni2+浓度减小,Fe-Ni合金共沉积的阴极极化增大;加入光亮剂和配位剂时,有利于提高镀层的致密性,同时镀层的耐腐蚀性增强。通过计算Fe-Ni合金共沉积电极反应的表观活化能,阴极电极电势在-1.0～-1.2V时,表观活化能均>40kJ/mol,说明Fe-Ni合金的共沉积过程为电化学步骤控制。XRD表明Fe-Ni合金为固溶体晶体结构,SEM表明镀层表面光亮平滑。Electrochemical behaviors of Fe-Ni alloy electrodeposition in different of Fe^2＋, Ni^2＋,pH, temperature, brightener, complexant were studied by the methods of linear potential sweep, cyclic voltammetery. From the results it can be concluded that when pH value decreased and temperature increased, the cathodic polarization of Fe-Ni alloy electrodeposition decreased. With increasing the concentration of Fe^2＋ and decreasing the concentration of Ni^2＋, the cathodic polarization increased. Brightener and complexant played a role of increasing cathodic polarization and were useful to make Ni-Fe alloy brighter and density. At the same time they could enhance corrosion resistance of coatings. The apparent active energy of the electrode reaction of electrodepositon Fe-Ni alloy coating within an electrode potential range of -1.0 to -1.2V was calculated to be above 40kJ/mol, indicating that the electrodepositon process of the Fe-Ni alloy coating was dominated by electrochemical polarization. The XRD pattern showed that Ni-Fe alloy was a solid solution with a crystal structure, the SEM pattern indicated that its appearance was smooth and bright.

关 键 词：电化学行为 FE-NI合金 电沉积 

分 类 号：TQ153.2[化学工程—电化学工业]