FED-STD-791D
6.2 Prepare the apparatus (Figure 3) as follows:
a. Fill bottom 5 cm of jar with the synthetic sea water-sulfurous acid solution and
then lower the turntable assembly into jar.
b. Place disk in specimen holder (Figure 2) with ice jacket on top.
c. Mount the complete specimen assembly in one of the holes of the turntable and
start the turntable.
d. Turn on the air and regulate rate of flow to 472 mL/s (1 ft3/min).
e. Two min after the spray has started, place ice in ice jackets in order to cause a
fine condensate to form on the surfaces of disks.
6.3 Perform test as follows:
a. Continue spraying for 2 h with a rate of flow of approximately 0.4 mL/s.
b. Discontinue the spray at the end of two hours; remove the ice jackets; and raise
the turntable above the jar to allow specimens to dry for two hours at room
temperature. The two-hour spray and two-hour drying period shall constitute
one cycle.
c. Rinse the test specimens after each full cycle, while still retained in the holder,
with distilled water (ASTM D 1193 - Type III) and dry with a stream of air.
d. After each cycle examine test specimen for evidence of visible corrosion, pitting
or staining.
e. Repeat the test cycle until failure occurs. Failure is defined as the first visible
sign of corrosion, pitting or staining.
7. CALCULATIONS
7.1 This section is not applicable to the test procedure.
8. REPORTING
8.1 Report the number of test cycles completed prior to failure. Report the
amount and type of corrosion present.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method Prepared by:
Navy - NADC - 1986
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