ASTM D2649-20a

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of the standard as published by ASTM is to be considered the official document.
Designation: D2649 − 20 D2649 − 20a
Standard Test Method for
Corrosion Characteristics of Solid Film Lubricants
This standard is issued under the fixed designation D2649; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers the evaluation of the galvanic and environmental corrosion interaction characteristics of dry solid film
lubricants when in contact with an aluminum surface under conditions of high humidity.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information
only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
B209 Specification for Aluminum and Aluminum-Alloy Sheet and Plate
B308/B308M Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles
D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
D1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
D1748 Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet
D2247 Practice for Testing Water Resistance of Coatings in 100 % Relative Humidity
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
2.2 U. S. Military Specifications:
MIL-PRF-680 Degreasing Solvent
MIL-PRF-3043 Resin-Coating, Permanent, for Engine Components and Metal Parts
2.3 Other Standards:
SAE AS5272 Lubricant, Solid Film, Heat Cured, Corrosion Inhibiting, Procurement Specification
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricantsand is the direct responsibility of Subcommittee
D02.L0.05 on Solid Lubricants.
Current edition approved Sept. 1, 2020Dec. 1, 2020. Published October 2020December 2020. Originally approved in 1967. Last previous edition approved in 20142020
as D2649 – 04 (2014).D2649 – 20. DOI: 10.1520/D2649-20.10.1520/D2649-20A.
Reference may be made to Military Specification MIL-L-8937 (ASG), Jan. 22, 1963, and Method 3814 of Federal Test Method Standard No. 791.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096, http://www.sae.org.
*A Summary of Changes section appears at the end of this standard
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D2649 − 20a
3. Terminology
3.1 Definitions:
3.1.1 lubricant, n—any material interposed between two surfaces that reduces the friction or wear between them (see Test Method
wear, or both, between them.D4175).
3.2 Definitions of Terms Specific to This Standard:
3.2.1 dry solid film lubricant, n—on an aluminum surface, one consisting of friction-reducing powders bonded in tight matrix to
the surface of the metal.
4. Summary of Test Method
4.1 An aluminum panel having solid film deposited on one surface is contacted under load with the surface of an unlubricated
panel. The specimen is subjected to 95 % 6 3 % relative humidity at 49 °C (120 °F) for a period of 500 h. After this period, the
surface of the unlubricated panel is examined for evidence of corrosion.
5. Significance and Use
5.1 Surfaces are examined for signs of corrosion. Any sign of corrosion is an indication of potential field failure.
6. Apparatus
3 3 3
6.1 Bolt and Nut, Finished hex bolt, ⁄8-24, minimum 19 mm ( ⁄4 in.) long and finished hex nut, ⁄8-24. Bolt and nut shall be made
of corrosion-resistant aluminum or stainless steel. Two (2) nuts and two (2) bolts are required.
6.2 Channel, made of aluminum alloy 6061–T6, conforming to Specification B308/B308M, 76 mm (3 in.) wide, 36 mm (1.41 in.)
high, cut to 178 mm (7 in.) long. Holes for the bolts to pass through are drilled on the centerline of the channel 25 mm (1 in.) from
each end. Two (2) channels are required.
6.3 Humidity Environmental Test Chamber, capable of producing 95 % 6 3 % relative humidity, 49 °C 6 1 °C (120 °F 6 2 °F),
and conforming to Test Method D1748, Annex A1 on Humidity Cabinet Apparatus or Test Method D2247, Annex A1 on Apparatus.
6.4 Torque Wrench, with capacity of 2.8 N·m (25 lb·in.).
6.5 Micrometer, reading 0 mm to 25 mm 6 0.002 mm (0 in. to 1 in. 6 0.0001 in.) with a spherical anvil.
6.6 Forced-Circulation Oven, capable of maintaining a temperature of 66 °C 6 3 °C (150 °F 6 5 °F) and 149 °C 6 5.5 °C
(300 °F 6 10 °F).
7. Reagents and Materials
7.1 Panels, made of aluminum alloy 2024, conf
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