电沉积微量锌对高压阳极铝箔腐蚀扩面的影响  

Effect of trace electrodeposited zinc on surface area enlargement of high-voltage aluminum anode foil by electrolytic etching

作　　者：刘菲 朱开放 程金科[1] LIU Fei;ZHU Kai-fang;CHENG Jin-ke(College of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550003,China)

机构地区：[1]贵州大学化学与化工学院

出　　处：《电镀与涂饰》2019年第15期792-796,共5页Electroplating & Finishing

基　　金：贵州大学引进人才科研资助项目（贵大人基合字(2008)020号）;贵州省科学技术基金资助项目（黔科合J字[2009]2230号）;江苏中联集团博士后工作站资助项目

摘　　要：为解决高压阳极铝箔电蚀过程中发孔不均匀和并孔的问题,在铝箔表面电沉积微量Zn后才进行直流电蚀。研究了电沉积Zn的时间对铝箔腐蚀后的表面形貌、截面形貌、减薄率、质量损失率和腐蚀孔密度的影响。电沉积时间为10 s时,铝箔的腐蚀孔密度较大,分布均匀,并孔少,腐蚀效果最好。在铝箔腐蚀过程中,Zn能与Al形成电偶腐蚀,在铝箔表面指引点蚀生长,使铝箔的腐蚀电位负移,孔密度增大,并孔减少,比电容增大。To solve the problems such as non-uniform distribution of tunnels and merging of tunnels during electrolytic etching of high-voltage aluminum anode foil,trace zinc was electrodeposited on the surface of aluminum foil before direct-current anodic etching.The effect of zinc electrodeposition time on the surface morphology,cross-sectional morphology,thinning rate,weight loss,and pitting density of the etched aluminum foil was studied.The etching effect for an aluminum foil pre-electrodeposited with zinc for 10 seconds was the best as shown by a high pitting density,uniform distribution of tunnels,and few formation of merged tunnels.The galvanic corrosion occurring between Zn and Al during the etching of aluminum foil guides the pitting on the aluminum foil surface and results in a negative shift of corrosion potential,an increase of pitting density,and a reduction of merged tunnels,hence increasing the specific capacitance.

关 键 词：高压阳极铝箔 锌 电沉积 电化学侵蚀 电偶腐蚀 

分 类 号：TQ153.15[化学工程—电化学工业]