阴极偏压对Zn-Ni合金镀层电沉积行为的影响  

Effect of Cathodic Bias on Electrodeposition Behavior of Zinc-Nickel Alloy Coating

作　　者：周建奇[1] 鹿文姗[2] 符太文 张昭[2] 

机构地区：[1]海军装备技术研究所 [2]浙江大学化学系 [3]92351部队

出　　处：《材料保护》2014年第7期1-3,56,共4页Materials Protection

基　　金：国家自然科学基金(21073162;21273199);绿色化学合成技术国家重点实验室培育基地开放研究基金(GCTKF2012013);嘉兴市精英引领计划项目资助

摘　　要：碱性锌酸盐体系电沉积Zn-Ni合金镀层的研究还不系统。采用扫描电子显微镜(SEM)、能量色散谱仪(EDX)、电化学阻抗谱(EIS)等研究了碱性锌酸盐体系中A3钢表面Zn-Ni合金镀层的共沉积行为,考察了阴极偏压对Zn-Ni合金镀层成核/生长速率的影响规律。结果表明:通过恒电流电沉积技术得到的Zn-Ni合金镀层表面平整光亮,镀层中Ni含量为10.6%;Zn-Ni合金镀层的沉积过程遵循异常共沉积机制,镀液中的Zn2+阻碍了Ni2+的阴极还原反应过程;Zn-Ni合金镀层的沉积速率随着阴极偏压的变负而呈指数规律提高。A scanning electron microscope,an energy dispersive spectrometer,and an electrochemical testing system were performed to investigate the electrodeposition behavior of Zn-Ni alloy coating on A3 steel surface in an alkaline zincate bath,and the effect of cathodic bias on the nucleation and growth rate of the alloy coating was examined.Results indicated that Zn-Ni coating obtained by electrodeposition at constant current was smooth and bright and contained 10.6%Ni(mass fraction).The deposition process of Zn-Ni alloy coating followed abnormal co-deposition mechanism,and Zn^(2+) ion in the electroplating solution inhibited the cathodic reduction action of Ni^(2+) ion.In the meantime,the deposition rate of Zn-Ni alloy coating tended to increase exponentially with increasing bias.

关 键 词：Zn-Ni合金共沉积 阴极偏压 A3钢 电化学阻抗谱 

分 类 号：TQ153.2[化学工程—电化学工业]