MIL-STD-171F
5.3 Paint finishes for metals. Tables XIII, XIV and XV list most of the paint finishes for metals necessary for a wide variety of military equipment. An overwhelming percentage of metallic surfaces that are painted are steel (iron), or aluminum and magnesium, and their alloys. Tables XIII through XVI provide specifically for these metals, but the finishes are also suitable for zinc, cadmium, copper, tin, terne and titanium. In many finishes, aluminum and magnesium, and their alloys require special primers (see paragraphs 5.3.1 and 5.3.2). Special finishes are listed in table XVI. Acid catalyzed pretreatments (wash primers) shall not be utilized on high strength
steel parts (Rockwell C 40 or higher) without specific approval of the design/procuring activity. The design/procuring activity shall select the finish and shall reference it on drawings, in specifications or in contracts by the number shown in the tables.
5.3.1 Priming paint for aluminum.
5.3.1.1 Conventional primers. Primers on the QPD (Qualified Products Database) for meeting TT-P-1757 or MIL-PRF-23377 shall be used in tables XIII, XIV, XV and XVI for priming aluminum. In mixed metal assemblies with aluminum, finish 5.1.1 or 5.2 shall be specified as a pretreatment prior to application of these primers. When MIL-PRF-23377 is used, the contractor shall determine that the topcoat demonstrates adequate compatibility and adhesion to the primer, and that the primer adheres to the substrate.
5.3.1.2 Chemical agent resistant coatings (CARC) primers. MIL-DTL-53022, MIL-DTL-
53030, or MIL-DTL-53084 shall be used on pretreated ferrous or non-ferrous metals, or where both ferrous and non-ferrous metals are present in the same assembly, prior to the application of the CARC topcoat. MIL-PRF-23377 or MIL-PRF-85582 may be used on pretreated non-ferrous metals or on mixed ferrous and non-ferrous assemblies (Type I only of MIL-PRF-23377).
5.3.2 Priming paint for magnesium (conventional and CARC). Unless otherwise specified, epoxy primers on the QPD meeting MIL-PRF-23377, MIL-PRF-85582, MIL-DTL-
53022, MIL-DTL-53084 or MIL-DTL-53030 shall be used in tables XIII, XIV, XV, and XVI in lieu of
MIL-P-11414 in priming magnesium, Unless otherwise specified, MIL-C-8514 (finish 8.7) shall be specified as a minimum pretreatment prior to application of primer and the phosphoric acid content for this pretreatment coating shall be reduced to 50 percent of that required by MIL-C-
8514. When MIL-DTL-53022, MIL-DTL-53030, MIL-PRF-23377, MIL-PRF-85582 or MIL-DTL-
53084 is used the contractor shall determine that the topcoat demonstrates adequate adhesion to the primer and that the primer adheres to the substrate.
5.3.3 Priming paint for dissimilar metal assemblies. The primer used with dissimilar metal assemblies shall be primer specified for the anodic or less noble member of the assembly. For example, a component composed of magnesium and steel will require the use of primers for magnesium as specified in paragraph 5.3.2. The cathode (steel) shall also be coated prior to assembly with sealant as stated in paragraph 5.2.4.2.
5.3.4 Number of coats of paint, minimum. The number of coats indicated under remarks in the following tables includes primer (if used), for example, finish 20.4 consists of one (1) coat of primer plus one (1) coat of topcoat. The coating thickness shall be as specified in paragraph
5.2.3 for the individual paints.
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