Anodizing model and CV simulation for etched aluminium foil for high voltage

The core of aluminium electrolytic capacitors anode foil is the pit distribution of etched foils and the specific capacitance of formed foils, there is still no well-developed system to evaluate both at once. In this study, a pit anodizing model and a method to simulate the CV value of high-voltage etched aluminium foil is proposed. The model processes scanning electron microscopy photographs of high-voltage etched aluminium foils, models the growth of alumina in the 200–600 V ranges, takes into account the pit clogging phenomenon of the anodic oxidation process by image processing, corrects and specifies the formation constants and dielectric constants of alumina at different formation voltages. The model can reflect the growth pattern of alumina in the standard process. With the model proposed in this work, the CV values of aluminium foils at each formation voltage are simulated. The simulated results have a mean deviation of 1.4% from the actual experimental values, which can accurately simulate the real performance of the etched foil. This simulation method can evaluate the performance of aluminium foil after anodizing by considering both the pit distribution and the anodizing environment. It can also be used to compare the applicable working voltage ranges of different etched foils. This can help factories and laboratories with etching foil selection, greatly reducing material and time consumption.