Ni,Fe及Ni-Fe合金阳极在H_2SO_4溶液中的电化学行为  

Electrochemical Behavior of Nickel-Iron Alloy Anode as well as Nickel and Iron Anodes in Sulfuric Acid

作　　者：程华[1] 郭红霞[1] 汤云晖[1] 王群[1] 王澈[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：《材料保护》2011年第6期22-24,3,共3页Materials Protection

基　　金：863国家高技术研究发展计划(2007AA06Z320);教育部科学技术研究重大项目(309008);北京工业大学研究生科技基金(ykj-2010-4072)资助

摘　　要：电镀过程中,通常采用镍板和铁板单金属联合阳极,其调整较为繁琐,以镍铁合金作阳极,方便生产,但过去鲜见Ni-Fe合金阳极溶解的电化学行为的报道。利用线性扫描伏安法研究了Ni-Fe合金阳极在0.5 mol/L H2SO4溶液中的阳极电化学行为,考察了不同Cl-浓度对极化曲线的影响。结果表明,Fe对Ni-Fe合金阳极活化溶解区起主要的活化作用,而稳定钝化区主要是由金属Ni的钝化作用引起的;Ni-Fe合金阳极溶解是一种不可逆的电极过程,阳极溶解速度受电化学极化控制;Cl-对Ni-Fe合金阳极具有活化作用,其临界活化浓度为0.1 mol/L。The anodic electrochemical behavior of Ni-Fe alloy anode in 0.5 mol/L H2SO4 solution was investigated by means of linear scanning voltammetry.The influence of varying Cl-concentration on polarization curves was studied.It was found that the anodic dissolution activation of Ni-Fe alloy was mainly attributed to Fe,while the stable passivation was mainly attributed to Ni.The anodic dissolution of Ni-Fe alloy was an irreversible electrode process,and its anodic dissolution rate was dominated by electrochemical polarization.Cl-was able to activate Ni-Fe alloy anode,and its critical activation concentration was 0.1 mol/L.

关 键 词：Ni—Fe合金阳极 Ni阳极 Fe阳极 阳极钝化 H2SO4溶液 Cl- 电化学行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理]