1、Designation: D2649 04 (Reapproved 2014)Standard Test Method forCorrosion Characteristics of Solid Film Lubricants1This standard is issued under the fixed designation D2649; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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. Scope1.1 This test method2covers the ev
3、aluation of the corrosioncharacteristics of dry solid film lubricants under conditions ofhigh humidity.1.2 The values stated in SI units are to be regarded as thestandard. The inch-pound units given in parentheses are forinformation only.1.3 This standard does not purport to address all of thesafety
4、 concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3B209 Specification for Aluminum an
5、d Aluminum-AlloySheet and PlateB308/B308M Specification for Aluminum-Alloy 6061-T6Standard Structural ProfilesD235 Specification for Mineral Spirits (Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D1730 Practices for Preparation of Aluminum andAluminum-Alloy Surfaces for PaintingD1748 Test Meth
6、od for Rust Protection by Metal Preserva-tives in the Humidity CabinetD4175 Terminology Relating to Petroleum, PetroleumProducts, and Lubricants2.2 U. S. Military Specifications:4Mil-PRF-3043 Resin-Coating, Permanent (for Internal En-gine Parts)2.3 Government Standard:5P-D-680 Dry Cleaning and Degre
7、asing Solvent3. Terminology3.1 Definitions:3.1.1 lubricant, nany material interposed between twosurfaces that reduces the friction or wear between them (seeTest Method D4175).3.2 Definitions of Terms Specific to This Standard:3.2.1 dry solid film lubricant, non an aluminum surface,one consisting of
8、friction-reducing powders bonded in tightmatrix to the surface of the metal.4. Summary of Test Method4.1 An aluminum panel having solid film deposited on onesurface is contacted under load with the surface of an unlubri-cated panel. The specimen is subjected to 95 6 3 % relativehumidity at 49C (120F
9、) for a period of 500 h. After thisperiod, the surface of the unlubricated panel is examined forevidence of corrosion.5. Significance and Use5.1 Surfaces are examined for signs of corrosion. Any signof corrosion is an indication of potential field failure.6. Apparatus6.1 Bolt and Nut, Finished hex b
10、olt,38-24, minimum19-mm (34-in.) long and finished hex nut,38-24. Bolt and nutshall be made of corrosion-resistant aluminum or stainlesssteel. Two (2) nuts and two (2) bolts are required.6.2 Channel, made of aluminum alloy 6061T6, conform-ing to Specification B308/B308M, 76-mm (3-in.) wide, 36-mm(1.
11、41-in.) high, cut to 178-mm (7-in.) long. Holes for the boltsto pass through are drilled on the centerline of the channel25 mm (1 in.) from each end. Two (2) channels are required.6.3 Humidity Environmental Test Chamber, capable of pro-ducing 95 6 3 % relative humidity, 49 6 1C (120 6 2F), andconfor
12、ming to Test Method D1748, Annex A1 on HumidityCabinet Apparatus.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products, Liquid Fuels, and Lubricantsand is the direct responsibility ofSubcommittee D02.L0.05 on Solid Lubricants.Current edition approved May 1, 2014. Pub
13、lished July 2014. Originally approvedin 1967. Last previous edition approved in 2009 as D264904(2009). DOI:10.1520/D2649-04R14.2Reference may be made to Military Specification MIL-L-8937 (ASG), Jan. 22,1963, and Method 3814 of Federal Test Method Standard No. 791.3For referenced ASTM standards, visi
14、t the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philade
15、lphia, PA 19111-5094, Attn: NPODS.5Available from Superintendent of Documents, U. S. Government PrintingOffice, Washington, DC 20402.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.4 Torque Wrench, with capacity of 2.8 Nm (25 lbin.)
16、.6.5 Micrometer, reading 0 to 25 6 0.002 mm (0 to1 6 0.0001 in.) with a spherical anvil.6.6 Forced-Circulation Oven, capable of maintaining atemperature of 66 6 3C (150 6 5F) and 149 6 5.5C(300 6 10F).7. Reagents and Materials7.1 Panels, made of aluminum alloy 2024, conforming toSpecification B209,
17、76 by 152 by 0.5 mm (3 by 6 by 0.020 in.)thick, anodized in accordance with Practices D1730, Type C,Method 2.NOTE 1Other metals and alloys, with other methods of surfacepretreatment, may be used in this test method for special purpose. Suchdeviations shall become a part of the report, 10.1.7.2 Dry C
18、leaning Solvent, conforming to SpecificationD235 or Federal Specification P-D-680.7.3 Resin Coating, permanent (for internal engine parts),conforming to Military Specification Mil-PRF-3043.8. Sampling, Test Specimens, and Test Units8.1 Be certain there is sufficient quantity of solid filmlubricant m
19、ixture 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 (see7.2).8.2.2 Deposit a film of resin coating on the surface of thealuminum channel and cure in accordance with
20、 the manufac-turers specification.8.2.3 Apply solid film lubricant to the surface of the panelby spraying or equivalent method to produce a dry filmthickness between 0.005 and 0.013 mm (0.0002 and0.0005 in.).8.2.4 In most cases, curing will be according to the particu-lar manufacturers specification
21、s. If such instructions are notprovided, cure the film by air drying for6hat26.7 6 3C(80 6 5F) or by air drying for 30 min at 26.7C followed by1 h in an air-circulating oven at 149 6 5.5C (300 6 10F).8.2.5 Measure the dry film thickness using a micrometer.9. Procedure9.1 Arrange the panels (see Fig.
22、 1) by placing a coated panelagainst an uncoated panel at a 90 angle to each other; placethem between the aluminum channel, insert the bolts, andtighten the nut and bolt combination to a constant load of2.8 Nm (25 lbin.) using a torque wrench. Discard any nuts orbolts that show evidence of corrosion
23、 that might lessen theeffect of the tightening torque.9.2 Run a blank assembly with uncoated panels concomi-tantly with each set of samples as a check on the whole processof panel preparation.9.3 If it is planned to make inspections prior to the comple-tion of the normal 500-h period, prepare additi
24、onal assembliesso that no reassembly will be required.9.4 Place the assembly in a preheated oven at 65.6 6 4C(150 6 8F) for 2 h.9.5 Remove the assembly after 2 h and immediately placethe assembly into the humidity cabinet at 49 6 3C(120 6 5F), 95 6 3 % relative humidity.NOTE 2Assemblies may be place
25、d in the cabinet in any suitable wayto avoid interference with each other and drippage of condensate. Hangingfrom the rotor is permissible but not specifically recommended.9.6 Disassemble and inspect the coated and uncoated con-tact surfaces at 500 h unless some other test period isspecifically requ
26、ired.ABolt38 24 UNF3ABNut38 24 UNF3BCAluminum channel coated with resin coating conforming to Military Specification Mil-PRF-3043. (Resin shall be cured in accordance with the manufacturersspecifications.)FIG. 1 Corrosion Test JigD2649 04 (2014)210. Report10.1 Report the conditions of application an
27、d curing of thecoatings.10.2 Report any evidence of pitting, etching, or formation ofwhite deposits on the coated and uncoated panels.10.3 Report dimensions and alloy of the panels used, if theyare different from those described in 7.1.11. Precision and Bias11.1 Since the results of the test are onl
28、y intended to give apass/fail rating, no statement will be made about either theprecision or the bias of this test method.12. Keywords12.1 aluminum alloy; corrosion characteristics; solid filmlubricantASTM International takes no position respecting the validity of any patent rights asserted in conne
29、ction with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsi
30、ble technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful co
31、nsideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100
32、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 04 (2014)3
