Optical Reflectance of Metallic Coatings: Effect of Aluminum Flack Orientation.
Optical Reflectance of Metallic Coatings: Effect of
Aluminum Flack Orientation.
Sung, L. P.; Nadal, M. E.; McKnight, M. E.; Marx, E.;
Journal of Coatings Technology, Vol. 74, No. 932,
55-63, September 2002.
metallic coatings; coatings; appearance; confocal
microscopy; flake orientation; optical reflectance;
pigmented coatings; ray scattering model
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.