MIL-DTL-14072F
3.5.4.4 Use of steel wool. Steel wool shall not be used under any circumstances
to clean aluminum or magnesium surfaces. Residual steel particles can become
entrapped resulting in the formation of corrosion sites which may damage finish integrity
and/or the basis metal. Use of emery or garnet abrasives on aluminum or magnesium is
preferred.
3.6 Fabricated parts. Parts formed or fabricated by means of lock seams, lap
joints, or by a means other than soldering, brazing, welding, or die forming, shall be
plated, passivated, or both, prior to forming and fabricating operations. As an alternate,
the design shall be such that plating, passivating, and/or neutralizing solutions will drain
from the part. For example, aluminum to be lap-seamed and riveted should be anodized
prior to the riveting operation.
3.7 Potential problems to be considered prior to the specification of cadmium or
zinc coatings.
a. Chromate-treated zinc-coatings, cadmium-plated, or zinc-base alloy parts
shall not be used when such parts may be exposed to ambient temperatures above 71°C
while in service. This does not apply to baking temperatures in excess of 71°C which
may be required to cure paint during the finish process. In lieu of cadmium or zinc
coating for items to be subjected in service to higher temperature conditions than 71°C,
MIL-P-53022 (softens at about 120°C) or MIL-C-87115, in conjunction with a suitable
top coat finish as recommended in cited specifications prior to final finishing, should be
applied. MIL-P-14105 is a high temperature paint option where applicable.
b. Unpainted cadmium, zinc-plated and zinc-base alloy parts shall not be used
in assemblies where they would be in confined unventilated spaces and subject to vapors
emanating from phenolic insulating varnishes, phenolic encapsulating compounds,
uncured phenolic materials, or air drying alkyd paints (e.g.,; Master Painter Institute
(MPI) Reference #47 and MIL-DTL-15090) as severe corrosion problems are likely to
occur.
3.8 Use of sealants and anti-seize compounds.
3.8.1 Threaded parts for aluminum and magnesium alloys. Prior to assembly, all
externally threaded parts for use in aluminum and magnesium alloys shall be coated with
anti-seize compound in accordance with A-A-59313. For magnesium alloys, an equal
weight mixture of zinc chromate pigment and petrolatum is also acceptable.
3.8.2 Openings. To preclude unnecessary finish requirements for the interior of
equipment exposed to Type I environmental conditions, openings not required for an
electronic system s operation shall be sealed to prevent fluid entry or direct exposure to
exterior environment. Sealing around access plates shall be provided in a configuration
that will allow removal of access plates without damaging the sealant or surrounding
metal.
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