碱性锌酸盐体系Zn-Fe合金电镀异常共沉积研究  

Anomalous Codeposition in the Electrodeposition of Zn-Fe Alloy from Alkaline Zincate Bath

作　　者：王云燕[1] 柴立元[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《材料保护》2008年第1期4-8,共5页Materials Protection

摘　　要：采用分电流曲线法研究了碱性锌酸盐体系Zn-Fe合金电镀异常共沉积的规律。研究发现:Zn-Fe合金共沉积在低电流密度下为正常共沉积,高电流密度下为异常共沉积,且存在一转换电流密度;锌铁离子摩尔比、NaOH、配合剂等影响锌铁离子阴极还原交换电流密度的因素均对转换电流密度有影响;Zn-Fe合金共沉积过程中锌发生了欠电势沉积。锌铁离子的交换电流密度不同是引起Zn-Fe合金异常共沉积的主要原因。The transition rule from normal to anomalous codeposition in the electroplating of Zn-Fe alloy coating from an alkaline zincate bath was studied using partial-current-curve method,and the causes leading to the anomalous codeposition of Zn-Fe alloy were discussed.It was found that the Zn-Fe alloy experienced normal codeposition at a low current density,which was transformed into a-nomalous codeposition at a high current density.The corresponding transition current density was closely related to the mole ratio of Zn-Fe and the concentration of NaOH and complex agent which had significant effects on the current density of Zn2+ and Fe2+ during cathodic reduction exchange as well.Moreover,Zn experienced underpotential deposition during the codeposition of the Zn-Fe alloy coating,and the anomalous codeposition of Zn-Fe alloy was mainly attributed to the difference in the exchange current density of Zn2+ and Fe2+ ions.

关 键 词：碱性锌酸盐体系 ZN-FE合金电镀 异常共沉积 规律 形成机理 

分 类 号：TQ153[化学工程—电化学工业]