双阴极电解腐蚀工艺对阳极铝箔侵蚀性能的影响

The effect of the double-cathode electrolytic process on the corrosion properties of anode aluminum foil

为改善阳极铝箔腐蚀形貌,增大腐蚀比表面积,减少铝箔的质量损失,采用在直流电作用下,外加垂直于铝箔的石墨板与原有石墨板共同构成腐蚀阴极,铝箔为阳极,在H_2SO_4和HCl混酸中进行电蚀发孔,对腐蚀铝箔的失重率,减薄率进行分析,用扫描电镜(SEM)检测铝箔腐蚀后形貌。结果表明,在直流电蚀工艺下,通过调整阴极极板面积和放置方式,铝箔表面能产生较均匀、浅而长的表面隧道,且在表面隧道中,能继续形成点蚀孔,使腐蚀铝箔比表面积增大,比容相对增加;一定腐蚀时间范围内,腐蚀时间对铝箔减薄率影响很小,腐蚀时间适应范围较宽,有利于工艺调整;最佳的电解腐蚀工艺参数为:腐蚀温度80℃、腐蚀电流密度0.10 A/cm^2、腐蚀时间120 s。

In order to improve the anode aluminum foil corrosion morphology, to increase the specific surface area of corrosion, and to reduce the mass loss of the aluminum foil at the same time, the author adopted the H2 SO4-HC1 DC etching process that the graphite plates were added perpendicular to aluminum foils, the cathode was formed with the added graphite plates and the original ones, and the aluminum foil formed the anode. The weight loss ratio and the reduction rate were investigated, and the morphology of the aluminum foil after corro- sion was investigated by SEM. It is found that in the process of DC etching, by regulating the area of cathode plate and the way of placement, uniform, shallow and long tunnel ap- pears on the surface of the foil, pitting holes continue to form in the surface tunnel, as such, the specific surface area of corrosion aluminum foil is enlarged and the specific volume is in- creased relatively. The corrosion time in a certain range has little influence on the foil reduc- tion, and this range is wide, so it is helpful to the process regulation. The best corrosion pa- rameters are to set with temperature at 80℃, corrosion current as 0.10 A/cm^2, and corrosion time as 120 s.