A number of test
methods, of which this is one,
make use
of bench tests to
indicate how well a
lubricant will protect steel from rusting. These methods
are most often
used for comparatively
low viscosity oils, such as
turbine or aircraft oils.
Cold - rolled sheet steel panels 2 x 4 x 1/8 inch, surface ground
to a finish of approximately 20 micro –inches as measured by a
Brush analyzer, are used as
specimens. These are coated
with the
oil by dipping after
which they are
held in a rotating
table in a cabinet into
which water is
atomized. The cabinet is capable
of regulation from
110 to 160 degree F, but
most tests are run at
the lower temperature for a given
number of days or
hours.
The specimens are
observed through a window
at the end of the first
24 hours and
each subsequent 24
hours increment of exposure. The time
of failure of a
specimen is recorded
as the day on
which at least 3 rust
sports 1 millimeter in diameter
forms on the front
surface of the
specimen in the central
area which excludes
¼ -inch zones adjacent to
the top and
sides and a ½ - inch zone at the
bottom. Three specimens are coated with particular oil. At least
two of these
must last the
specified time without failure.
