MIL-DTL-14072F
b. Surfaces not exposed to view. Type I surfaces not exposed to view when
equipment is in either transit or operating condition shall be painted or plated.
Exceptions to this plating or painting requirement are as follows:
(1) Magnesium-alloy parts shall be painted.
(2) Parts fabricated from metals or alloys listed in Groups I through 5 of
Table VI (except copper) require no further finishing.
(3) Screws, nuts, bolts, and washers fabricated from ferrous alloys and
plated with cadmium shall be painted on all surfaces exposed after incorporation of these
parts in assemblies.
(4) Machined or welded corrosion-resistant steel parts shall be passivated
with the finish designated as E300.
3.14.2 Finishing of Type II surfaces. Surfaces of parts fabricated from metals or
alloys listed in Groups 1 through 11 of Table VI require no further finishing. All other
parts except magnesium and magnesium alloys shall be finished with any applicable
Type I or Type II finish specified in Tables I, III, or IV. Magnesium and magnesium
alloys shall be painted in accordance with the requirements of Table I.
3.14.3 Conditions restricting allowable finishes. In addition to the forgoing
requirements, the selection of finishes shall be limited as follows:
a. Dissimilar metal contacts involving magnesium alloys. All parts shall be
painted prior to assembly. The magnesium alloys shall be painted and a tape conforming
to A-A-59298 shall be interposed between the two surfaces. The tape shall extend to at
least 0.32 cm beyond the periphery of the joint. All exposed edges, in addition to the
tape, shall be sealed with a material conforming to SAE-AMS-S-8802, MIL-PRF-81733,
or SAE-AMS 3276. Butt joints shall be protected by grooving the seam to a width of not
less than 0.32 cm and filling with sealing compound conforming to SAE-AMS-S-8802,
MIL-PRF-81733, or SAE-AMS 3276. The depth of the groove shall be sufficient to
retain the sealing compound. After application, the compound shall be smoothed to be
flush with the surface(s) of adjacent dissimilar metals. The use of cloth tapes is
prohibited.
b. Dissimilar metal contacts (except those involving magnesium and
magnesium alloys). When using basis metal parts intended for intermetallic contact that
may form couples not allowed by Table VI, the following shall govern:
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