MIL-PRF-46002D
After the specified period, examine the panels for corrosion dots, disregarding any corrosion
appearing within 6 mm of any edge, or any surface stain that can be removed by absorbent tissue
and naphtha. The panels shall exhibit a combined total of not more than three corrosion dots,
none of which exceed 1 mm in length, width or diameter (see 3.3.2.3).
4.2.2.3 Acid neutralization.
4.2.2.3.1 Test panels. Prepare three panels measuring 76 x 51 x 1.6 mm of the same
material and cleaned and polished in the same manner as specified for the humidity cabinet test
(see 4.2.2.2.1).
4.2.2.3.2 Test procedure. Using forceps, totally immerse each of three test panels for not
more than one second in a 0.1 0.01 weight percent aqueous hydrobromic acid solution.
Without draining excess acid from the panels, immediately transfer the panel from the
hydrobromic acid to a 400-ml beaker containing the sample of the oil being tested. Totally
immerse the panel and remove it from the oil twelve times in 60 seconds. Change the position of
the tips of the forceps for each immersion, to assure of the oil to all surfaces of the panel. Set all
three panels in a slotted wooden block support and store them at 25 3C for 4 hours. At the
completion of the storage period, remove the coatings from the panels with hexane and examine
them for corrosion dots, disregarding any corrosion or staining appearing within 3 mm of any
edge of a panel or within 3 mm of the line of contact of a panel and the upper surface of the slot
in the wooden block support. The panels shall exhibit a combined total of not more than three
corrosion dots, none of which exceed 1 mm in length, width or diameter (see 3.3.3).
4.2.2.4 Water displacement and water stability. To determine conformance to 3.3.4, the
oil shall be tested in accordance with method 3007 of FED-STD-791. There shall be no
evidence of rust, mottling, or surface stains on the panels following the test.
4.2.3 Interface requirements verifications.
4.2.3.1 Copper strip corrosion. To determine conformance to 3.4.1, prepare a blend
composed of 5% by volume of the oil and 95% by volume of diesel fuel oil conforming to
A-A-52557. Test this blend in accordance with ASTM D130. Perform the test at 100 1C for
6 hours 5 minutes in an oven with one exception: Use 20 ml of the blend in a sample tube
(25 x 150 mm) and 10 mL of the blend in another sample tube. Carefully immerse a polished
copper strip partially in the tube containing 20 mL of the blend and carefully partially immerse
another polished copper strip in the tube containing 10 mL of the blend. Place the tubes in the
copper strip corrosion test bombs. After the test withdraw the copper strips and wash them and
examine them for evidence of corrosion or tarnishing. The copper strips shall exhibit a value not
more than 2c in accordance with the ASTM D130 Copper Strip Corrosion Standards.
4.2.3.2 Metal protection (immersion).
4.2.3.2.1 Test specimens. Test specimens shall consist of one each of the following
metals in Table V, and measuring 51 x 25 x 5.4 mm.
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