MIL-DTL-6162C
3.3.2 Materials. Materials used in the manufacture of the machine shall be of high quality, suitable for the
purpose, and shall conform to applicable Government specifications. Materials conforming to contractor's
specifications may be used provided the specifications are approved by the qualifying Government activity and
contain provisions for adequate tests. The use of the contractor's specifications does not constitute waiver of
Government inspection.
3.3.2.1 Metals. To the maximum extent practicable, metals shall be of a corrosion-resistant type or suitably
treated to resist corrosion due to aircraft fluids, salt spray, or atmospheric conditions as may be encountered in
storage and normal service.
3.3.2.1.1 Dissimilar metals. Dissimilar metals, as defined by MIL-STD-889, shall not be used in contact with
each other. Where such contact is unavoidable, the metals shall be protected against electrolytic corrosion. When
protection is used, it shall be of such a type that a low impedance path is offered to radio frequency currents.
3.3.2.1.2 Magnesium alloy parts. The use of magnesium is prohibited unless specifically approved for each
application by the using service. Where approved, magnesium alloy parts shall be surface treated for protection
against corrosion in accordance with SAE-AMS-M-3171.
3.3.2.1.3 Castings. Castings shall be in accordance with MIL-STD-2175, and shall be so indicated on the
applicable specification sheets.
3.3.2.2 Nonmetals. Nonmetals when used, including plastics, fabrics, and protective finishes, shall be moisture
resistant, and shall not support fungus growth, or shall be treated with a fungicidal agent acceptable to the procuring
agency. The nonmetals shall not support combustion, and shall not be adversely affected by weather, aircraft fluids,
temperatures, and ambient conditions encountered during operation of the aircraft. Nonmetals may be treated to
conform to this requirement.
3.3.2.3 Finishes and protective coatings.
3.3.2.3.1 Cleaning, treating, and painting. Unless otherwise specified herein, metal parts shall be cleaned,
treated, and painted in accordance with current industry practices. However, when plating is specified, the cleaning
of the metal shall conform to MIL-S-5002 or current industry practices. Alternate methods satisfactory to the
procuring agency may be utilized.
3.3.2.3.2 Cadmium plating (steel parts). With the exception of the parts listed below, all exterior steel parts and
other steel parts subject to corrosion and not in constant contact with oil, shall be cadmium plated in accordance
with QQ-P-416, Type II or III and Class 2, as applicable. In cases where cadmium plating is considered impractical
or undesirable, an equivalent treatment, which is acceptable to the procuring agency, shall be provided.
EXCEPTIONS
a.
Corrosion-resistant steel parts.
b.
Members or portions of members which act as bearing surfaces or journals.
c.
Magnet frame.
d.
Steel end-bells, brush-cover band.
e.
Quill shaft.
f.
Mounting face.
g.
QAD mating "V" sections.
3.3.2.3.3 Anodic film for aluminum and aluminum parts. Aluminum and aluminum alloy parts shall be
covered by an anodic film conforming to MIL-A-8625. The aluminum oxide film deposited by the treatment shall
be removed from actual contact area of all surfaces required to act as a path for electric current and from local areas
under screws, nuts, or other hardware used for assembly or mounting purposes, to provide an adequate bonding
connection. Aluminum alloys, which do not anodize satisfactorily shall be coated with a chemical coat conforming
to MIL-C-5541. Where the primary purpose of the treatment is to afford a suitable paint base, chemical treatment
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