锌镍合金镀液中锌镍离子浓度对镀层镍含量的影响  

Influence of Concentration of Zn^(2+) and Ni^(2+) in Bath on Content of Nickel in Electroplated Zn-Ni Alloy Coating

作　　者：杜楠[1] 赵晴[1] 吴浩杰 王春霞[1] 

机构地区：[1]南昌航空大学材料学院,江西南昌330063 [2]舟山中远船务工程有限公司,浙江舟山316131

出　　处：《材料保护》2008年第9期8-10,84,共3页Materials Protection

摘　　要：为了得到成分较稳定的锌镍合金镀层,考察了镀液中锌、镍离子浓度对镀层镍含量影响情况,发现镀液中锌镍离子摩尔浓度比对镀层镍含量影响最大;控制镀液中c(Ni2+)/[c(Ni2+)+c(Zn2+)]为0.15～0.17、c(Ni2+)+c(Zn2+)在0.17～0.40mol/L范围内,能得到镍含量质量分数在13%左右的高耐蚀性锌镍合金镀层。循环伏安曲线分析表明,在合金电镀过程中,Zn2+的存在和析出会在阴极表面形成中间产物吸附膜,使镍的还原受阻,导致合金镀层的镍含量低于镀液中的c(Ni2+)/[c(Ni2+)+c(Zn2+)],锌镍合金共沉积表现为异常共沉积。The effect of concentration of Zn2+ and Ni2+ in plating bath on the content of Ni in electroplated Zn-Ni alloy coating was investigated,while the deposition process of the alloy coating was analyzed by measuring cyclic voltametric curves.It was found that the ratio of molar concentration of Zn2+ and Ni2+ in the plating bath had the most significant effect on the content of Ni in Zn-Ni alloy coating.It was feasible to prepare Zn-Ni alloy coating with Ni mass fraction of about 13% and good corrosion resistance by controlling the total concentration of Zn2+ and Ni2+ in the plating bath as 0.17~0.40 mol/L and the ratio of Ni2+ concentration to Ni2+ concentration plus Zn2+ concentration as 0.15~0.17.The analysis of the cyclic voltametric curves indicated that Zn2+ were able to form intermediate adsorbed film during the deposition process of Zn-Ni alloy coating,leading to retardance of the reduction of Ni2+ and decrease of the content of Ni in the alloy coating.Moreover,the codeposition of was dominated by anomalous codeposition.

关 键 词：锌镍合金电镀 锌镍离子浓度 镀层镍含量 

分 类 号：TQ153.2[化学工程—电化学工业]