Optical Reflectance of Metallic Coatings: Effect of Aluminum Flack Orientation.
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.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899