MIL-DTL-53072E
component blended feed with pure deionized water that is free of bacteria (conductivity less than
10 microhms/centimeter). After mixing components allow bath to be stirred and agitated for at
least a one (1) hour period to facilitate thorough mixing and reduction.
3.4.4.4 Reduction. After preparation of the bath, allow it to stir for at least one hour prior to use.
Continuous agitation, even while coating, is necessary after preparation to maintain homogeneity
of the diluted electrodeposition primer bath.
3.4.4.5 Application. All surfaces to be painted shall be thoroughly cleaned as specified in 3.2
and pretreated as specified in 3.3. To ensure a chemically clean surface, perform the test in
4.2.3.1.1. Failure to comply with 4.2.3.1.1 is sufficient cause to do additional cleaning. Since
the primer is applied via cathodic electrodeposition, the substrate to be coated is the negative
electrode, while the side electrodes are positive. Coat and cure as recommended by the coating
manufacturers' instructions.
3.4.4.6 Comments. The primer furnished under this specification shall be products which are
authorized by the qualifying activity for listing on the QPD (see 6.4). If a black electrocoat primer is
used, the minimum topcoat dry film thickness shall be 2 mils (50 microns) to ensure the infrared
reflectance (IR) signature requirements of the topcoat are met. In production situations where
abrasive cleaning or grit-blasting is used to remove mill scale, the profile of the metal shall be no
greater than 1 mil (25 microns). To achieve the required 1,000 hour salt spray resistance on ferrous
substrates, the electrodeposition primer DFT shall be equal to or greater than the average blasted
profile of the substrate. The proposed system of blasting, pretreatment and priming shall be checked
for compliance to MIL-DTL-53084, paragraph 3.6.7.
3.4.5 MIL-PRF-85582 (Primer Coatings: Epoxy, Waterborne).
3.4.5.1 Description. This specification covers the requirements for corrosion inhibiting,
chemical and solvent resistant, waterborne, epoxy primer coatings that meet a maximum VOC of
340 g/l (2.8 lbs/gal). The specification contains formulations that allow for standard pigments
(type I) and low infrared reflective pigments (type II). It also differentiates between systems with
barium chromate (class C1), strontium chromate (class C2) and non-chromate (class N) based
corrosion inhibitors.
3.4.5.2 Use. The primer is intended for use on pretreated nonferrous substrates and is
compatible with CARC topcoats. Type II shall not be used as a CARC primer, except on aircraft,
and where specifically required (see 6.6).
3.4.5.3 Preparation. The epoxy primer shall be prepared by first thoroughly mixing or agitating
component A. Component A is the pigmented base component of epoxy resin solution, and
component B is the curing agent. The two components are then mixed in the volume ratio specified
by the manufacturer. The preferred temperature range of each component shall be 60 to 90 oF (16 to
32 ºC) before mixing.
3.4.5.4 Reduction. Reduce the admixed primer with deionized water conforming to ASTM
D1193 type IV, or according to the manufacturer's recommended procedure. The thinned primer
shall be stirred thoroughly, strained through a 60 minimum mesh paint filter or equivalent and
allowed to stand for 30 minutes prior to use. Continuously stir the reduced primer throughout the
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