Influence of Anodizing Current on Structure and Color Intensity of Anodized Aluminium Alloys

Abstract

The study focuses on the effect of current density on physical and electrochemical properties of anodized 7075 aluminium alloys. Microstructural observation of the anodized specimen was performed using optical- and field emission scanning electron microscope. Spectrophotometer and potentiostat were used for investigation of color appearance and corrosion resistance, respectively. Difference in anodizing current density plays important role on the quality of microstructure, corrosion resistance and color intensity. Higher surface roughness of the layers, caused by large current density of anodizing process, was found to enhance a color intensity of specimen with a reduction of corrosion resistance. In the study, the optimized current density for producing high corrosion resistance is at 14 mA/cm2