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将高压铝电解电容器用电子铝箔在含Zn2+的5.0%NaOH溶液中实施化学镀锌处理,然后在HCl+H2SO4电解液中进行直流电解扩面腐蚀得到腐蚀箔;采用极化曲线研究化学镀锌处理对扩面腐蚀时铝箔点蚀电流、点蚀电位的影响,利用电化学交流阻抗(EIS)研究化学镀锌处理对铝箔电解腐蚀时电化学特征的影响;使用扫描电镜(SEM)观察化学镀锌处理对腐蚀箔表面和横截面形貌的影响;测试100 V形成电压下腐蚀箔的比电容。结果表明:铝箔表面化学镀锌形成的Zn-Al微电偶有助于电蚀时降低点蚀电极反应的阻力,提高点蚀电流密度,增加铝箔表面蚀孔密度和蚀孔分布的均匀性;随着碱液中Zn2+浓度的提高,腐蚀箔的比电容逐渐增加。
The high-voltage aluminum electrolytic capacitor was treated with electroless aluminum foil in Zn2 + -containing 5.0% NaOH solution, then the galvanic corrosion was eroded by direct current electrolysis in HCl + H2SO4 electrolyte. The polarization curve was used to study the electroless zinc coating The effects of electroless zinc oxide (EIS) on the electrochemical characteristics of aluminum foil were investigated by electrochemical impedance spectroscopy (EIS). The effects of electroless zinc plating on the electrochemical corrosion of aluminum foil were investigated by scanning electron microscopy (SEM) The effect of treatment on the surface and cross-sectional morphology of the corrosion foil was tested; the specific capacitance of the corrosion foil was tested at 100 V forming voltage. The results show that the Zn-Al micro-galvanic coating formed on the surface of aluminum foil can help to reduce the resistance of pitting electrode reaction, increase the pitting corrosion current density and increase the surface erosion density and uniformity of the distribution of pits. With the increase of Zn2 + concentration in lye, the specific capacitance of corrosion foil is gradually increased.