MIL-DTL-917F(SH)
TABLE XXII. Painting of metal for corrosion resistance. 1/
Primer 2/
Topcoats
Pretreatment
Metal
Specification minimum
Specification minimum
Specification
thickness (millimeters) 3/
thickness (millimeters) 3/
0.025
Ferrous metal
TT-C-490, Type I, II;
TT-P-645 or
MIL-DTL-53084
MIL-DTL-15090 4/, 2
Ferrous metals with
TT-C-490, Type III;
0.05; Formula 150
coats Type II or each
treatments other than those
MIL-DTL-24441
0.025 Type III
listed in table XVIII
Ferrous metals and
TT-P-645
0.025
Class 2 second coat may
aluminum alloys both used
be omitted on inside of
in same assembly 5/
enclosure and equipment
to be installed in interior
of ships 6/
For MIL-DTL-5541
Aluminum and aluminum
MIL-DTL-53084;
0.025
pretreated materials, only
alloys
TT-C-490, Type I;
a single coat should be
MIL-DTL-5541, Type II,
added to equipment
Class 1A
installed interior or
exterior of the ships 6/
NOTES:
1/
For details on painting procedures, see 3.14.2.
2/
The preferred primer is MIL-DTL-53084. TT-P-645 is second preference. If MIL-PRF-24712 is chosen as a
topcoat, no primer is required.
3/
Minimum dry film thickness.
4/
Applies to ferrous metals.
5/
For metals in direct contact, see 3.4.2.1.
6/
MIL-PRF-24712 is the preferred topcoat applied in one coat at 0.0049 to 0.0098 in. (0.125 to 0.250 mm).
MIL-DTL-15090, Types I, II, or III, Class 1 is second preference.
3.14.1.1 Interior surfaces of motors and generators. In case of salient pole motors and generators, metal
surfaces of armatures, rotors, and other rotating members shall be coated with insulating varnish. Non-rotating
interior surfaces of motors and generators may either be coated with insulating varnish or treated and painted as
required for other parts (see 3.14.1). When insulating varnish is used, no other treatment or processing is required.
Insulating varnish may be applied during the normal varnishing process required for windings or applied as a
separate process. Unless otherwise specified in the individual equipment specification or the contract or order, a
minimum of two coats shall be applied, using any method which will ensure coverage of all surfaces. Insulating
varnish shall be in accordance with MIL-I-24092.
3.14.2 Painting. The preferred painting method for prevention of corrosion and for environmental reasons is
powder coating. Powder coatings used shall be approved in accordance with MIL-PRF-24712.
3.14.2.1 Parts to be painted. Where necessary to obtain corrosion resistance, metal parts, except those of
3.14.2.2, shall be painted. Surfaces of corrosion-resistant metal (see 3.3.2.3) may be painted for appearance. When
a gray painted exterior is specified (see 6.2), exterior parts, except those cited in 3.14.2.2, shall be painted whether
or not corrosion-resistant.
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