1、Designation: D7038 15D7038 17Standard Test Method forEvaluation of Moisture Corrosion Resistance of AutomotiveGear Lubricants1This standard is issued under the fixed designation D7038; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONThis Portions of this test method isare written for use by laboratories that make use the portions ofthe
3、 test method that refer to of ASTM Test Monitoring Center (TMC) services (see Annex A1AnnexA1 Annex A4). Laboratories that choose not to use the TMC services may simply disregard theseportions.The TMC provides reference oils, and engineering and statistical services to laboratories that desireto pro
4、duce test results that are statistically similar to those produced by laboratories previouslycalibrated by the TMC.In general, the Test Purchaser decides if a calibrated test stand is to be used. Organizations such asthe American Chemistry Council require that a laboratory use the TMC services as pa
5、rt of their testregistration process. In addition, the American Petroleum Institute and the Gear Lubricant ReviewCommittee of the Lubricant Review Institute (SAE International) require that a laboratory use theTMC services in seeking qualification of oils against their specifications.NOTE 1The advan
6、tage of using the TMC services to calibrate test stands is that the test laboratory (and hence theTest Purchaser) has an assurance that the test stand was operating at the proper level of test severity. It should also beborne in mind that results obtained in a non calibrated test stand may not be th
7、e same as those obtained in a test standparticipating in the ASTM TMC services process.The advantage of using the TMC services to calibrate test stands is that the test laboratory (andhence the Test Purchaser) has an assurance that the test stand was operating at the proper level of testseverity. It
8、 should also be borne in mind that results obtained in a non calibrated test stand may notbe the same as those obtained in a test stand participating in the ASTM TMC services process.Laboratories that choose not to use the TMC services may simply disregard these portions.1. Scope*1.1 This test metho
9、d covers a test procedure for evaluating the rust and corrosion inhibiting properties of a gear lubricant whilesubjected to water contamination and elevated temperature in a bench-mounted hypoid differential housing assembly.2 This testmethod is commonly referred to as the L-33-1 test.1.2 The values
10、 stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.2.1 Exceptions(1) where there is no direct SI equivalent such as screw threads and national pip
11、e threads/diameters, and (2)the values stated in SI units are to be regarded as standard for the definitions in 12.2, and for SI units where there are no directinch-pounds equivalent units.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It i
12、s the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1 This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the
13、 direct responsibility of SubcommitteeD02.B0 on Automotive Lubricants.Current edition approved April 1, 2015May 1, 2017. Published May 2015May 2017. Originally approved in 2004. Last previous edition approved in 20142015 asD7038 14.D7038 15. DOI: 10.1520/D7038-15.10.1520/D7038-17.2 Until the next re
14、vision of this test method, theASTM Test Monitoring Center (TMC) will update changes in this test method by means of Information Letters. This editionincludes all Information Letters through 142.16-2. Information Letters may be obtained from the ASTM TMC, 6555 Penn Ave., Pittsburgh, PA 15206-4489, A
15、ttention:Administrator. The TMC is also the source of reference oils.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict
16、 all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International
17、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Gui
18、des and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)E29 Practice for Using Significant Digits in Test Data to
19、Determine Conformance with Specifications2.2 ASTM Standard:2.3 Society of Automotive Engineers Standards:4J308 Information Report on Axle and Manual Transmission LubricantsJ2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use2.4 U.S. Military Specifications:5MIL-PRF-2105E Lubricating Oil, G
20、ear, General MultipurposeMIL-P-3420F NOX-RUST Paper3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 corrosion, nan alteration of a finished metal surface by discoloration, accompanied by roughening not attributable tomechanical action.3.1.2 downtime, nan interruption of power t
21、o the test unit for a period greater than ten seconds.3.1.3 rust, na special case of corrosion, which always deteriorates or alters the original surface condition.3.1.3.1 DiscussionRust always has color (usually, but not limited to red, yellow, brown, black) and one of the following descriptive char
22、acteristics:(1) depth; the rusted surface is built up relative to that of adjacent areas. (2) texture; the surface may appear to be etched, scalyor otherwise visibly different than adjacent areas.3.1.4 stain, na surface modification that is attributable to discoloration only.4. Summary of Test Metho
23、d4.1 This procedure utilizes a Dana Corporation Model 30 hypoid differential assembly, Part No. 277701X, 4:10 ratio, standarddifferential with uncoated ring and pinion, without axle tubes.6,74.2 Test Unit PreparationPrior to each test, completely disassemble and clean the new differential housing as
24、sembly. Discardthe axle spacer block. Abrasive blast all rated parts (except bearings and cups). Disassemble all bearings from their mating partsprior to abrasive blasting. Coat all internal parts and rated surfaces with test oil. Reassemble the unit to test specification values.Install the unit on
25、the motoring rig and then connect an oil temperature monitoring probe and a drive shaft. Place a cooling fanand heat lamps into position near the test unit.4.3 Motoring PhaseCharge the test unit with 40 oz (1.2 L) of test oil. Drive the test unit with an electric motor at 2500 rminpinion speed in an
26、 unloaded condition (no axle shafts are used for the test). Add 1 oz (30 mL) of specified test water into the oilfill opening (all other test unit openings having been already sealed). Install the pressure relief system and set to 1 psi (7 kPa). Plugthe relief system when the lubricant temperature r
27、eaches 180F (82.2 C). Continue the motoring phase for 4 h at this controlledtemperature.4.1 Storage PhaseStop the motor at the completion of the motoring phase. Remove This procedure uses a new hypoiddifferential assembly as the primary test unit.The differential assembly is installed on a motoring
28、rig and charged with test lubricantand a small amount of water. The test unit is then sealed and driven until the lubricant temperature has increased to 180 F(82.2 C). The motoring phase is continued for 4 h and the test unit is then removed from the motoring rig and placeplaced in astorage box at 1
29、25F (52 C) for 162 h.for 162 h with the lubricant temperature controlled at 125 F (51.7 C). The test iscompleted at that time and the differential assembly is drained, disassembled, and inspected for rust, stain, and other deposits.3 For referencedASTM standards, visit theASTM website, www.astm.org,
30、 or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 Available from Society of Automotive Engineers SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.15096,
31、http:/www.sae.org.5 Available from the Defense Printing Service Office, 700 Robbins Ave., Bldg. 4D, Philadelphia, PA 19111-5094.9 If you are aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at ameetin
32、g of the responsible technical committee,1 which you may attend.D7038 1724.5 InspectionAt the end of the storage phase, the test is complete. Drain the differential assembly, disassemble, and rate forrust, stain, and other deposits.5. Significance and Use5.1 This test simulates a type of severe fiel
33、d service in which corrosion-promoting moisture in the form of condensed watervapor accumulates in the axle assembly. This may happen as a result of volume expansion and contraction of the axle lubricantand the accompanied breathing in of moisture-laden air through the axle vent. The test screens lu
34、bricants for their ability to preventthe expected corrosion.5.2 The L-33-1 test procedure is used or referred to in the following documents: ASTM Publication STP-512A,6 SAE J308,SAE J2360, and U.S. Military Specification MIL-PRF-2105E.6. Apparatus6.1 Laboratory Ambient Conditions:6.1.1 Test Operatin
35、g AreaThe ambient laboratory atmosphere shall be free of dirt, dust, and other contaminants as requiredby good laboratory standards.6.1.2 Parts Cleaning and Abrasive Blasting (6.2.8) AreasProvide adequate ventilation in areas where solvents (7.2) are used.(WarningWarningCombustible, vapor harmful.)6
36、.1.3 Build-up AreaIt is recommended that the atmosphere in the test unit build-up area be filtered and maintained at uniformtemperature and low humidity to prevent accumulation of dirt or rust on test parts. Otherwise it shall conform to requirements of6.1.1.6.1.4 Parts Rating AreaConduct the rating
37、 of all test parts under conditions as defined in ASTM Distress Rating Manual 21.76.2 Motoring Rig, Test Unit and Laboratory Equipment: Test UnitThis procedure uses a hypoid differential assembly (withoutaxle tubes) made by American Axle Mfg. The model designation is K2XX, Part No. P40128429A, 3:42
38、ratio, standard 218.4 mm(8.6 in.). This is an open differential with uncoated ring and pinion.8,9 Until June 23, 2017, a Dana Model 30 V01.1 may also beused.6.2.1 Test Unit ConfigurationMount the differential housing assembly (Gear version 99.1 or V01.1) on the motoring rig sothat the housing cover
39、attaching face is in the vertical plane and at a height that allows the temperature sensing probe to be locatedin the bottom of the housing. Elements of the motoring rig design are shown in Figs. A5.1-A5.4.6.2.2 Drive SystemThe drive system design is not precisely specified; however, the following e
40、quipment or its equivalent havebeen found to be suitable to turn the drive pinion at the specified (25002500 r 6 25) r/min. (min 6 25 rWarningmin.(WarningRotating test stand equipment presents a physical hazard, use safety guards.)6.2.2.1 U.S. Motors,Electric Motor, 1.5 hp (1.1 kW) electric motor, e
41、nclosed, 3600approximately 2.0 hp (1.5 kW), enclosed,3600 r r/min, min, 0.87 in. (22.2 mm) diameter shaft.,6.2.2.2 Slide Motor Base, Dyn-Adjust No. 20-C.,6.2.2.3 Dodge Taper Lock Pulleys, No. 40L100 (Driven) and No. 28L100 (Drive).,6.2.2.4 Dodge Timing Belt, No. 480L100.,6.2.2.5 Additional component
42、s such as shafts, couplings, and bearing blocks are also necessary to connect the abovecomponents to drive the carrier pinion, but are left to the option of the testing laboratory.6.2.3 Vapor Pressure Control SystemControl the internal vapor pressure of the unit during the warm-up portion of themoto
43、ring phase with a specified water column pressure relief system set for 1.0 6 0.1 psi (7 kPa 6 0.7 kPa) 1.0 psi 6 0.1 psi(7 kPa 6 0.7 kPa) connected to the housing cover with an appropriately sized National Pipe Threads (NPT) stainless steel 90street ell and a stainless steel full port valve. The sy
44、stem shall contain an oil trap and return vessel to return test oil to the unit incase of foaming, and a water trap and return vessel to prevent column water from moving back to test unit. The example set upin Fig. A5.1 has been shown to be acceptable.6.2.4 Housing Cover GasketReplace the factory-su
45、pplied gasket with a single TFE fluorocarbon gasket for every test.10,96.2.5 Housing Axle Tube Opening SealsSince the differential is tested without axle shafts or axle tubes, seal the housingopenings. Fig. A5.2 shows an example of construction dimensions for fabricating a pair of seals to be instal
46、led inUse a stainless6 ASTM Publication STP-512A, Laboratory Performance Tests forAutomotive Gear Lubricants Intended forAPI GL-5 Service,ASTM International, West Conshohocken,PA.7 For stock #TMCMNL21, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org.8 The so
47、le source of supply of the apparatus known to the committee at this time is Spicer Axle Division, Dana Corporation, P.O. Box 1209, Fort Wayne, IN46801.American Axle Manufacturing, 2965 Technology Dr., Rochester Hills, MI 48309.8 ASTM Publication STP-512A,Laboratory Performance Tests for Automotive G
48、ear Lubricants Intended for API GL-5 Service, ASTM International, West Conshohocken,PA.9 For stock #TMCMNL21, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org.10 The sole source of supply of the apparatus known to the committee at this time is a Power Drive P
49、arts Distributor.AP Services Inc., 203 Armstrong Drive, NorthpointIndustrial Park, Freeport, PA 16229. Request ASTM L-33-1 Die.D7038 173steel plumbing test plug for a 2.9 in. to 3.1 in. pipe diameter. McMasterCarr p/n 2908K2811,9 the axle housing openings beforeintroducing test oil prior to starting the test.with the outer washer and seal ring cut to 74 mm to 79 mm (2.9 in. to 3.1 in.) has beenfound acceptable. Install a pair of seals in the axle housing openings before installing carrier/case into the axle housing.When usingDana Mo
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