MIL-HDBK-1110
Appurtenant Works. Cathodic protection of gates is described in
CWGS 16643. Coatings for use on locks and dams must have good
abrasion resistance in addition to providing good corrosion
control. Vinyl systems have worked well for many years.
5.10
Factory Finished Metal Siding. Factory-finishing of
steel, galvanized steel, or aluminum siding is usually
accomplished by specialized procedures (e.g., coil coating) using
commercial products. It is best to consult the manufacturer of
the siding for recommended coating repair methods.
5.11
Chain Link Fences. Chain link fences are usually made
of galvanized steel (refer to NFGS-02821, Chain Link Fences and
Gates, or CEGS 02831, Fence, Chain Link). Occasionally, they are
made of vinyl-clad steel or aluminum-coated steel. As the
protective metals or vinyl corrode or erode away, they may need
coating to further protect them and/or to restore an attractive
finish. The fencing must be washed with a detergent solution to
remove loose contaminants before coating with a long-nap roller
or electrostatic spray equipment. The coating system should be
composed of two coats of acrylic latex (e.g., TT-E-2784) or one
coat each of epoxy-polyamide (e.g., MIL-P-24441, Formula 150) and
aliphatic polyurethane (MIL-C-85285).
5.12
Hot Steel Surfaces. Mufflers, stacks, and other hot
steel surfaces are not protected by conventional coatings,
because they are quickly burned away. Even thin fused aluminum
coatings such as TT-P-28 provide only limited protection,
provided that they are fused properly. (These coatings must be
exposed to at least 400 degrees F for a short time for fusion to
take place.) Such steel surfaces are better protected by
thermally sprayed zinc (withstand up to 700 degrees F) or
aluminum (withstand up to 1600 degrees F or higher when sealed)
after blasting to a white metal finish (SSPC SP 5). Thermal
spraying of aluminum is described in DOD-STD-2138(SH), Metal
Spray Coatings for Corrosion Protection Aboard Naval Surface
Ships (Metric).
5.13
Concrete Fuel Tanks. The DOD has many concrete fuel
tanks (mostly underground) that were built during World War II.
They have been lined with the cloth-reinforced latex coating
system described in NFGS-09980, Interior Linings for Concrete
Storage Tanks (for Petroleum Fuels), epoxy systems, and other
systems. Cloth-latex reinforced systems have been found to work
as well as any. However, they may not work well over concrete
that is contaminated with oil. Oil contamination is difficult to
remove and latex coatings do not bond well on this surface.
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