ASTM D2649 Test Method for Corrosion Characteristics of Solid Film Lubricants
6. Apparatus
6.1 Bolt, No. 3/8-24UNF-3A, made of aluminum alloy 2024, conforming to Specification B 211 and nut No. 3/8-24UNF-3B having threads conforming to Military Specification MIL-S-7742.
6.2 Channel, made of aluminum alloy 2024, conforming to Specification B 308, 179 mm (7 in.) long, 76 mm (3 in.) wide, and 35 mm (1 3/8 in.) high.
6.3 Humidity Environmental Test Chamber, capable of producing 95 +/- 3 % relative humidity, 49 +/- 1°C (120 +/- 2°F), and conforming to Method D 1748, Appendix X1.
6.4 Torque Wrench, with capacity of 2.8 N•m (25 lb•in.).
6.5 Micrometer, reading 0 to 25.4 +/- 0.0025 mm (1 +/- 0.0001 in.) with a 1-ball anvil.
6.6 Forced-Circulation Oven, capable of maintaining a temperature of 66 +/- 3°C (150 +/- 5°F) and 149 +/- 5.5°C (300 +/- 10°F).
7. Reagents and Materials
7.1 Panels, made of aluminum alloy 2024, conforming to Specification B 209, 76 by 152 by 0.5 mm (3 by 6 by 0.020 in.) thick, anodized in accordance with Method D1730, Type C, Method 2.
NOTE 1 - Other metals and alloys, with other methods of surface pretreatment, may be used in this method for special purpose. Such deviations shall become a part of the report, 10.1.
7.2 Dry Cleaning Solvent, conforming to Specification D235 or Federal Specification P-D-680.
7.3 Resin Coating, permanent (for internal engine parts), conforming to Military Specification MIL-R-3043.
8. Sampling, Test Specimens, and Test Units
8.1 Be certain there is sufficient quantity of solid film lubricant mixture to perform the test.
8.2 Prepare the apparatus and specimens as follows:
8.2.1 Liquid degrease the aluminum channel, nuts, bolts, and test panels with hydrocarbon dry cleaning solvent (see 7.2).
8.2.2 Deposit a film of resin coating on the surface of the aluminum channel and cure in accordance with the manufacturer's specification.
8.2.3 Apply solid film lubricant to the surface of the panel by spraying or equivalent method to produce a dry film thickness between 0.005 and 0.013 mm (0.0002 and 0.0005 in.).
8.2.4 In most cases, curing will be according to the particular manufacturer's specifications. If such instructions are not provided, cure the film by air drying for 6 h at 26.7 +/- 3°C (80 +/- 5°F) or by air drying for 30 min at 26.7°C followed by 1 h in an air-circulating oven at 149 +/- 5.5°C (300 +/- 10°F).
8.2.5 Measure the dry film thickness using a micrometer.
