MIL-DTL-81706B
The aluminum used to fabricate the panels shall be free of pits, scratches, mill markings, or
imperfections due to irregularity of heat treatments.
4.4.2 Panel cleaning.
4.4.2.1 Panel cleaning prior to conversion coating . Test panels shall be cleaned with
materials that remove soil without damaging the metal. The panels shall be cleaned to remove
oxides and all foreign substances. Acid solutions, when required, shall be used for removal of
oxides and the characteristic surface smut. The panels shall be rinsed thoroughly with water
prior to coating application. Abrasives containing iron, such as steel wool, iron oxide rouge, or
steel wire are prohibited for all cleaning operations as particles from them may become
embedded in the metal and accelerate corrosion. The panels shall be handled during all cleaning
and subsequent treatments so that mechanical damage or contamination is avoided.
4.4.2.2 Vertical adherence panels (forms IV and V only). The 7075-T6 aluminum panels
required for the vertical adherence shall be cleaned with an acetone rinse. The panels shall then
be marked with a pencil line 4 inches (101 mm) from one end, prior to testing for vertical
adherence in accordance with 4.5.6.
4.4.3 Conversion coating application. Panels prepared and cleaned in accordance with
4.4.1 and 4.4.2, except for class 1A, form VI, method D, shall be conversion coated on all
surfaces in accordance with the manufacturer's instructions. All panels shall be dried at
temperatures between 70 to 90 °F (21 to 32 °C) for 24 hours prior to testing, except panels to be
used for coating weight determination (see 4.5.4). For class 1A, form VI, method D, panels
prepared and cleaned in accordance with 4.4.1 and 4.4.2 shall be conversion coated on one side
in accordance with the manufacturer's instructions. All panels shall be dried at ambient
conditions for not less than 24 hours. Panels 1 through 5 exposed to salt spray shall have edges
protected by wax or other method approved by the qualifying activity.
4.4.4 Panel finishing.
4.4.4.1 Paint adhesion panels. Test panels prepared, cleaned, and conversion coated in
accordance with 4.4.1 through 4.4.3 shall be finished with one coat of a volatile organic
compound (VOC) compliant epoxy-polyamide primer conforming to MIL-PRF-23377 and
MIL-PRF-85582 to a dry film thickness of 0.0006 to 0.0009 inch (0.6 to 0.9 mil). Panels
prepared from class 1A, form VI, method D, shall be air dried for 14 days before testing. All
other panels shall be allowed to dry in accordance with the primer specification, prior to testing
for paint adhesion in accordance with 4.5.2.
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