MIL-DTL-14055G
4.7.7.3 Procedure.
a. When the strips are ready for testing, weigh them to the nearest 0.1 mg.
b. Fasten one strip of each of the metals together through the holes in the strips, using an uncoated
cotter pin or a Size Number 6 or 8 uncoated mild steel bolt with nut, to ensure electrolytic contact
between the strips.
c. The strips shall be arranged on the pin in the same order in which they are listed above (see
4.7.7.2) and shall be bent as required so that there will be a separation of at least 1/8 inch (3 mm)
between adjacent strips for a distance of approximately 2-1/4 inches (60 mm) measured from the
free end of the strips.
d. The three sets of assembled strips shall then be placed in separate screw cap jars of
approximately 1-pint capacity.
e. The screw caps shall be made of tinned steel (no organic coating), containing no gasket or liner,
and shall have a 1/32-inch (0.8 mm) hole drilled near the center of the cap.
f. One wheel cylinder cup shall be placed in the container in such a manner that the pinned ends of
the strips rest in and, are in contact with the concavity of the cup.
g. A sufficient amount of brake fluid meeting the requirements of MIL-PRF-46176 shall be poured into
each jar to a depth of 1/2 inch (12.7 mm) above the tops of the assembled strips.
h. The lids of the jars shall then be secured and the jars placed for 120 ± 2 hours in a gravity
convection oven maintained at a temperature of 212°F ± 3.6°F (100°C ± 2°C). Following the test
period, the metal strips and the rubber cups shall be removed from the jars.
i. The metal strips shall be disassembled, cleaned of all adhering sediment, sludge, and corroded
particles, by being first flushed with water and wiped with a cloth wetted with isopropyl alcohol or
95 percent ethyl alcohol.
j. The strips shall then be visually examined for evidence of corrosion, pitting, or etching.
k. The strips shall be brought to constant weight in a desiccators and then weighed to nearest 0.1
milligram.
l. Calculate the weight loss per unit area of each strip by dividing the observed loss in weight of the
strip (in milligrams) by its total surface area (in square centimeters).
m. The average of the three determinations made in each type of metal specimen shall be calculated
and recorded as the average weight loss in milligrams per square centimeter to determine
conformance to 3.4.6.1.
n. The three rubber cups, when removed from the fluid, shall be quickly washed with isopropyl
alcohol or 95 percent ethyl alcohol, dried with a clean lint-free cloth, and visually examined for
evidence of sloughing, softening, tackiness, and disintegration to determine conformance to
o. The base diameter and hardness of the rubber cups shall be measured to determine compliance
with the requirements specified in 3.4.6.2.
p. These measurements shall be made within 10 minutes following removal of the cups from the
fluid.
q. One-hundred milliliters of test fluid-water mixture shall be centrifuged in a cone-shaped centrifuge
tube and the volume of sediment determined in accordance with ASTM D91 to determine
conformance to 3.4.6.3.
4.7.8 Storage corrosion.
4.7.8.1 Apparatus. The apparatus shall include a humidity cabinet capable of maintaining 70°F to 115°F
(21°C - 46°C) at 95 percent humidity; three cylinder assemblies of proper size for the size of cups being
tested; containing unanodized aluminum pistons and hydraulic assembly fluid conforming to
MIL-PRF-46176.
20
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business