The effect of electrolyte temperature on formation of porous aluminium oxide films in anodising process

Abstract

A porous aluminium oxide film formed on aluminium was prepared in a mixed electrolyte of phosphoric acid and acetic acid solution. The morphology, growth and thickness of the film were investigated. The anodising process was done by varying the anodising temperature from 5 °C to 25 °C. The constant anodising voltage was applied at 130 V and the anodising was done in the mixture of H3PO4 1M and CH3COOH 0.25M. The results indicated that the growth of aluminium oxide film was greater in temperature of 15 °C. The morphology, pore size and thickness of the oxide film were examined by scanning electron microscope (SEM). Results indicated that at 15 °C to 20 °C, larger pore diameter was obtained. This study was explored the effect of anodising temperature to the formation of porous aluminium oxide film in the anodising process.