Optical quality of anodized aluminium used in decorative application is significant especially when the objective is to produce uniform and bright appearance of the anodized layer. However miscoloring and scattering of light is a big problem. It is believed that appearance of the anodized layer is controlled by alloy constituents in micrometer size, microstmcture and texture of the aluminium substrate and the formed oxide layer. In this paper optical properties of anodized aluminium is studied experimentally. The aluminium substrate is heat treated differently post and after the forging process. The aluminium substrate is turned, which is supposed to result in an ideal cusp shape, and then it is anodized. The color of the anodized layer is measured using CIE-Lab. Roughness of the surface is measured before and after anodizing using stylus and bidirectional reflection distribution function (BRDF). This paper presents a comparison of stylus and BRDF result on the samples and discusses the different surface features that give rise to the measured roughness and color.
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