MIL-HDBK-1110
each other and with the steel to provide this protection. The
two basic types of zinc-rich coatings, organic and inorganic
zinc, will be described later in this handbook.
A film of inorganic zinc silicate coating is unique
because the film is relatively porous. Initially, the coating
protects steel by cathodic protection, but its corrosion products
gradually fill the porosity, so that it becomes a barrier
coating. Should this barrier coat become scratched to expose the
steel substrate, cathodic protection will begin again until the
damage is healed. An inorganic zinc silicate coating is also
unique in that it reacts with the steel to form a chemical bond.
Many organic coatings rely on physical rather than chemical
bonding to steel.
1.5
Painting for Purposes Other Than Protection.
Facilities are often painted for other purposes than, or in
addition to, protection. These include appearance, marking, and
safety.
1.5.1
Cosmetic Appearance. Painting is an important factor
in promoting morale and productivity. NAVFAC P-309, Colors for
Navy Shore Facilities, and Army TM5-807-7, Color for Buildings,
present scientific approaches to the use of color to improve
working and living environments.
FED-STD-595, Colors Used in Government Procurement,
presents standard colors currently used by the Government. The
colors are identified by five-digit numbers, and defined by
fundamental color data. The standard, also available as a
fandeck, includes reference chips of each color.
1.5.2
Marking Paints. Marking paints are used on airfield
runways, streets, and parking lots. Their chief function is to
provide safety for personnel and equipment.
1.5.3
Safety Colors and Designs. Safety colors and designs
are used on military installations for rapid identification of
hazards or safety equipment. They are also described in NAVFAC
P-309.
1.5.4
Reflective Finishes. Reflective finishes on concrete
floors of hangars and shops may increase the lighting for
workmen, particularly in sheltered areas such as under the wings
of aircraft. Such smooth floors are easier to keep clean.
1.5.5
Nonskid Surfaces. Nonskid surfaces are frequently made
by adding grit to coatings on floors, ramps, and other walking
surfaces to provide slip resistance.
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