FED-STD-791D
Method 5331.1
September 30, 1986
CORROSION PROTECTION OF STEEL AGAINST SULFUROUS ACID-
SALT SPRAY BY SOLID FILM LUBRICANTS
1. SCOPE
1.1 This method is used to evaluate the corrosion preventive properties of dry,
solid-film lubricant under the combined conditions of salt, sulfurous acid, and humidity
environment.
2. SUMMARY
2.1 A steel disk having solid film lubricant deposited on one surface is subjected
to the cycling effect of salt spray and drying. After each cycle of salt spray and drying,
the disks are examined for evidence of corrosion.
3. SAMPLE SIZE
3.1 180 mL of solid-film lubricant of a sprayable consistency.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Air Supply - filtered, 69 gage kPa to 103 gage kPa (10 to 15 psig).
4.2 Air flow regulator - capable of regulating air flow at 472 mL/s (1 ft3/min).
4.3 Spray Nozzle (Figure 1) - corrosion resistant with a 13 cm (5 in) diameter
acrylic baffle which prevents direct impingement of the spray, but allows a fine mist full
contact with the disks.
4.4 Turntable Assembly which consists of:
a. Turntable - corrosion resistant, 26.7 cm diameter with holes for mounting test
holders and specimens.
b. Driving Mechanism - capable of mechanically rotating turntable at 1/3 rpm by
an electric motor (slow speed), encased within a protective acrylic box and
mounted above jar on an arrangement of flexaframe support rods.
4.5 Specimen Holders - holder cap (Figure 2) and ice jacket (aluminum) that is so
placed as to be in direct contact with back of test specimen.
4.6 Jar - 30.5 cm I.D. and 30.5 cm high.
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