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Optical Reflectance of Metallic Coatings: Effect of Aluminum Flack Orientation.


pdf icon Optical Reflectance of Metallic Coatings: Effect of Aluminum Flack Orientation. (238 K)
Sung, L. P.; Nadal, M. E.; McKnight, M. E.; Marx, E.; Laurenti, B.

Journal of Coatings Technology, Vol. 74, No. 932, 55-63, September 2002.

Keywords:

metallic coatings; coatings; appearance; confocal microscopy; flake orientation; optical reflectance; pigmented coatings; ray scattering model

Abstract:

The orientation of platelet-like pigments in coatings is affected by the processing conditions resulting in appearance variations of the final product. A set of aluminum-flake pigmented coatings having different flake orientations was pre-pared using various spray conditions. The orientations of individual flakes were determined using laser scanning confocal microscopy. The orientation distribution was then used as input to a ray scattering model to calculate the optical reflectance of these coatings. The pigment orientation distributions and the measured optical reflectance as a function of scattering angle will be presented and the latter will be compared to the calculated reflectance.