FED-STD-791D
unsoiled. When the strip is clean, immediately immerse it in the prepared
sample.
NOTE 3:
It is important to polish the whole strip uniformly to obtain a uniformly
strained strip. If the ends show wear (surface elliptical) they will likely
show more corrosion than the center. The use of a vise will facilitate
uniform polishing.
6.2 Fill test tube with sample to depth of 5 cm. Remove air pockets from the
grease by tapping the tube on the bench or table as it is being filled.
6.3 Using stainless steel forceps, insert copper strip until it touches the bottom of
the tube.
6.4 Place the test tube (supported approximately vertically in 100C) oven for 24
h (unless otherwise specified).
6.5 At the end of the specified time, remove test tube from oven and allow it to
cool at room temperature.
6.6 Using forceps, remove copper strip, and wash in non-corrosive ACS grade
n-hexane. (See Note 4.)
Caution. n-Hexane is both toxic and flammable. Use only in a well
NOTE 4:
ventilated area. Do not breathe its fumes nor allow it to come in contact
with the skin. Keep all flames away from the n-hexane.
7. CALCULATIONS
7.1 This section is not applicable to the test procedure.
8. REPORTING
8.1 Report whether the section of the strip immersed in the sample is darker in
color than the exposed section.
8.2 Report by describing any corrosion of the strip when examined under a
microscope of approximately 60 diameters magnification.
8.3 Report development of any green color in the grease.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method prepared by:
Navy - NADC - 1986
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