AA APC Aluminum-Pigmented Coatings for Industrial Maintenance Applications
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AA APC Document Information:
Title
Aluminum-Pigmented Coatings for Industrial Maintenance Applications
The Aluminum Association Inc.
Publication Date:
Jan 1, 1996
Scope:
Aluminum pigments are manufactured from pure aluminum and possess many
of the characteristics of
the base metal itself. Typical purity of the aluminum used to
manufacture powders and pastes range
from 99.0% to 99.97% depending on the grade being produced. When
milled into a pigment or flake,
the most striking feature is the geometry of the particle itself. This
flakelike shape is
responsible for many of the beneficial characteristics of aluminum
pigment. Aluminum flakes have
excellent corrosion resistance, are highly reflective, and repel both
infrared and ultraviolet
radiation.
Aluminum pigments, unlike most nonmetallic pigments, have a lamellar
geometry. This scalelike
configuration, along with the metallic nature of the pigment, provides
a combination of unique
aesthetic and physical properties. Leafing grades may vary in
appearance from a flat silver color
to a highly polished, almost chromelike effect. When incorporated into
a coating, the flakes orient
themselves in layers parallel to the substrate and film surface. The
nonleafing grades provide
metallic or polychromatic effects with varying degrees of sparkle and
color.
Aluminum flakes viewed under a microscope appear as flat, irregularly
shaped particles. The many
perimeter indentations and surface irregularities result from the ball
milling process. The actual
size of the flakes will vary depending on the grade. Commercial grades
will range from 0.1 to 2.0
um in thickness and 0.5 to 200 µm in diameter.
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