The Effects of Electropolishing Pretreatment Conditions on Surface Quality and Color of Aluminum Foil

In this research, the effect of electropolishing treatment on the roughness and luminosity of aluminum foil and quality of blue color after dyeing on anodized film was investigated. For this purpose, the effect of solution composition (Perchloric acid: ethanol with volume ratio 1:5, 1:6 and 1:7), voltage (5-25 volt) and electropolishing duration (2-9 min) were studied. Atomic force microscopy (AFM) and Photoshop were used to study on surface coating. The AFM results showed that electropolishing under optimal conditions (2 min, 15 volt, Perchloric: ethanol with volume ratio 1:5) have good effect on surface quality, so that Rz value for anodized sample after dyeing of 34.35 nm were reduced to 1.50 nm by electropolishing pretreatment. J. Color Sci. Tech. 7(2014), 297-307©. Institute for Color Science and Technology.