聚乙二醇-600对酸性Zn-Ni合金的电沉积行为及镀层耐蚀性影响的研究  

Effect of Polyethylene Glycol-600 on Acidic Zn-Ni Alloy Electroplating and Its Corrosion Resistance

作　　者：刘永强 刘光明[1] 范文学 甘鸿禹 唐荣茂 师超 LIU Yongqiang;LIU Guangming;FAN Wenxue;GAN Hongyu;TANG Rongmao;SHI Chao(School of Material Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;China Anhui Dingwang Environmental Protection Material Technology Co.Ltd.,Xuancheng 242000,China)

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063 [2]安徽鼎旺环保材料科技有限公司,宣城242000

出　　处：《中国腐蚀与防护学报》2022年第2期235-242,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51961028)。

摘　　要：采用循环伏安(CV)曲线研究了聚乙二醇-600(PEG-600)在酸性Zn-Ni合金基础镀液中对Zn-Ni合金电沉积行为的影响;采用电化学阻抗谱(EIS)、动电位极化曲线与表面形貌分析方法研究了酸性Zn-Ni合金基础镀液中,聚乙二醇-600的浓度对Zn-Ni合金镀层表面微观形貌及耐蚀性的影响。结果表明,PEG-600作为一种非离子型表面活性剂,在基体镀件表面具有较强的吸附能力,基础镀液中添加PEG-600会影响Zn-Ni合金的电沉积过程,使Zn^(2+)与Ni^(2+)更难迁移至镀件表面,导致Zn-Ni合金的共沉积峰位置向更负电位方向移动,从而使阴极过电位升高。基础镀液中随PEG-600浓度的增加,电沉积所得Zn-Ni合金镀层的耐蚀性呈先增大后减小的趋势。当PEG-600浓度为3.33×10^(-2) mol/L时,Zn-Ni合金镀层耐蚀性能达到最佳,其电化学阻抗模值为1960Ω·cm^(2)、自腐蚀电流为1.97×10^(-5) A·cm^(-2),并且能得到均一的金属间化合物γ相和最优的表面微观形貌。The effect of polyethylene glycol-600(PEG-600)on the acidic Zn-Ni alloy plating process was studied by means of cyclic voltammetry(CV)curve measurement.The influence of the concentration of polyethylene glycol-600(PEG-600)in the acidic Zn-Ni alloy plating electrolyte on the corrosion resistance and the surface morphology of the Zn-Ni alloy coatings was characterized via electrochemical impedance spectroscopy(EIS),Taffel polarization curve measurement and surface morphology analysis method.The results show that PEG-600,as a non-ionic surfactant,has a strong adsorption capacity on the surface of cathode.The addition of PEG-600 to the plating electrolyte will affect the electroplating process of the Zn-Ni alloy,making it more difficult for Zn^(2+)and Ni^(2+)to move to the surface of the cathode,as a result,the co-deposition peak position of Zn-Ni may move towards negative potential direction,so that the cathode overpotential rises.With the increase of the concentration of PEG-600 in the plating electrolyte,the corrosion resistance of the electroplated Zn-Ni alloy coating increases first and then decreases.When the concentration of PEG-600 is 3.33×10^(-2) mol/L,the corrosion resistance of the electroplated Zn-Ni alloy coating reaches the best,namely the coating with electrochemical impedance of 1960Ω·cm^(2) and free-corrosion current of 1.97×10^(-5) A·cm^(-2),and the Zn-Ni alloy coating consists of uniformly intermetallic compoundγphase with better surface morphology in micro scale.

关 键 词：聚乙二醇-600 酸性Zn-Ni镀液 电沉积 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]