Prozess zur Anodisierung von Aluminiumbändern mit hoher elektrischer Durchschlagsspannung

Process for anodizing of aluminum stripes with high electrical breakdown voltage The Aim of the research was to develop an anodizing process for generating a high breakdown voltage on aluminum stripes in the shortest processing time possible. In order to vary process parameters in a wide range, a flexible discontinuous anodizing laboratory device was designed in cooperation with Steinert Elektromagnetbau GmbH Köln. By means of the liquid contact method, conditions equal to non‐solid contact anodizing of aluminum stripes in continuous laboratory devices were simulated. The research was focused on the development of the current pulse shape. The results show that the highest possible breakdown voltages can be achieved in a short processing time using suitable electrical parameters (current pulse shape) and the appropriate post‐treatment. The films generated by the new technology (current pulse shape referred to as “TUCAL”) reveal a higher pore density than conventional layers. This results in a higher ductility (less tendency for cracking).