ASTM D7038-2018a Standard Test Method for Evaluation of Moisture Corrosion Resistance of Automotive Gear Lubricants.pdf

1、Designation: D7038 18D7038 18aStandard 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 revisio

2、n, 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.INTRODUCTIONPortions of this test method are written for use by laboratories that make use of ASTM TestMonitoring C

3、enter (TMC) services (see Annex A1 Annex A4).The TMC provides reference oils, and engineering and statistical services to laboratories that desireto produce test results that are statistically similar to those produced by laboratories previouslycalibrated by the TMC.In general, the Test Purchaser de

4、cides if a calibrated test stand is to be used. Organizations such asthe American Chemistry Council require that a laboratory use the TMC services as part of their testregistration process. In addition, the American Petroleum Institute and the Gear Lubricant ReviewCommittee of the Lubricant Review I

5、nstitute (SAE International) require that a laboratory use theTMC services in seeking qualification of oils against their specifications.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

6、 operating at the proper level of testseverity. It 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 dis

7、regard these portions.ASTM International policy is to encourage the development of test procedures based on genericequipment. It is recognized that there are occasions where critical/sole-source equipment has beenapproved by the technical committee (surveillance panel/task force) and is required by

8、the testprocedure. The technical committee that oversees the test procedure is encouraged to clearly identifyif the part is considered critical in the test procedure. If a part is deemed to be critical, ASTMencourages alternative suppliers to be given the opportunity for consideration of supplying t

9、he criticalpart/component providing they meet the approval process set forth by the technical committee.An alternative supplier can start the process by initiating contact with the technical committee(current chairs shown on ASTM TMC website). The supplier should advise on the details of the parttha

10、t is intended to be supplied. The technical committee will review the request and determinefeasibility of an alternative supplier for the requested replacement critical part. In the event that areplacement critical part has been identified and proven equivalent, the sole-source supplier footnoteshal

11、l be removed from the test procedure.1. Scope*1.1 This test method 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 tes

12、tmethod is commonly referred to as the L-33-1 test.1 This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of SubcommitteeD02.B0 on Automotive Lubricants.Current edition approved April 1, 2018Oct. 1, 2018.

13、 Published April 2018October 2018. Originally approved in 2004. Last previous edition approved in 20172018 asD7038 17.D7038 18. DOI: 10.1520/D7038-18.10.1520/D7038-18A.2 Until the next revision of this test method, theASTM Test Monitoring Center (TMC) will update changes in this test method by means

14、 of Information Letters. This editionincludes all Information Letters through 17-1.1781. Information Letters may be obtained from the ASTM TMC, 6555 Penn Ave., Pittsburgh, PA 15206-4489, Attention:Administrator. The TMC is also the source of reference oils.This document is not an ASTM standard and i

15、s 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 all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the

16、 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, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.2 The values stated in i

17、nch-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 pipe threads/di

18、ameters, 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 is the respon

19、sibilityof the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability ofregulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationest

20、ablished in the Decision on Principles for the Development of International Standards, Guides 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) (H

21、ydrocarbon Dry Cleaning Solvent)E29 Practice for Using Significant Digits in Test Data to 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 Multipurpo

22、se (Metric) Military Use2.4 U.S. Military Specifications:5MIL-PRF-2105E Lubricating Oil, Gear, 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 r

23、oughening not attributable tomechanical action.3.1.2 downtime, nan interruption of power to 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 (usuall

24、y, but not limited to red, yellow, brown, black) and one of the following descriptive characteristics:(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, n

25、a surface modification that is attributable to discoloration only.4. Summary of Test Method4.1 This procedure uses a new hypoid differential assembly as the primary test unit. The differential assembly is installed ona motoring rig and charged with test lubricant and a small amount of water.The test

26、 unit is then sealed and driven until the lubricanttemperature has increased to 180 F (82.2 C). The motoring phase is continued for 4 h and the test unit is then removed from themotoring rig and placed in a storage box for 162 h with the lubricant temperature controlled at 125 F (51.7 C). The test i

27、scompleted at that time and the differential assembly is drained, disassembled, and inspected for rust, stain, and other deposits.5. Significance and Use5.1 This test simulates a type of severe field service in which corrosion-promoting moisture in the form of condensed watervapor accumulates in the

28、 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 lubricants for their ability to preventthe expected corrosion.3 For referencedASTM standards, visit theA

29、STM website, www.astm.org, 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 SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096, http:/www.sae.org

30、.5 Available from the Defense Printing Service Office, 700 Robbins Ave., Bldg. 4D, Philadelphia, PA 19111-5094.D7038 18a25.2 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. A

31、pparatus6.1 Laboratory Ambient Conditions:6.1.1 Test Operating 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 solvent

32、s (7.2) are used.(WarningCombustible, vapor harmful.)6.1.3 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 requirem

33、ents of6.1.1.6.1.4 Parts Rating AreaConduct the rating of all test parts under conditions as defined in ASTM Distress Rating Manual 21.76.2 Test UnitThis procedure uses a hypoid differential assembly (without axle tubes) made byAmericanAxle Mfg. The modeldesignation is K2XX, Part No. P40128429A, 3:4

34、2 ratio, standard 218.4 mm (8.6 in.). This is an open differential with uncoatedring and pinion.8,9 Until June 23, 2017,December 31, 2018, a Dana Model 30 V01.1 may also be used.6.2.1 Mount the differential housing assembly on the motoring rig so that the housing cover attaching face is in the verti

35、cal planeand at a height that allows the temperature sensing probe to be located in the bottom of the housing. Elements of the motoring rigdesign are shown in Figs. A5.1-A5.4.6.2.2 Drive SystemThe drive system design is not precisely specified; however, the following equipment or its equivalent have

36、been found to be suitable to turn the drive pinion at the specified 2500 rmin 6 25 rmin. (WarningRotating test standequipment presents a physical hazard, use safety guards.)6.2.2.1 Electric Motor, approximately 2.0 hp (1.5 kW), enclosed, 3600 rmin, 0.87 in. (22.2 mm) diameter shaft.6.2.2.2 Slide Mot

37、or 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 components such as shafts, couplings, and bearing blocks are also necessary to connect the abovecomponents to drive the carrier pinion,

38、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 themotoring phase with a specified water column pressure relief system set for 1.0 psi 6 0.1 psi (7 kPa 6 0.7 kPa) connected to thehou

39、sing cover with an appropriately sized National Pipe Threads (NPT) stainless steel 90 street ell and a stainless steel full portvalve. The system shall contain an oil trap and return vessel to return test oil to the unit in case of foaming, and a water trap andreturn vessel to prevent column water f

40、rom moving back to test unit. The example set up in Fig. A5.1 has been shown to beacceptable.6.2.4 Housing Cover GasketReplace the factory-supplied 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 shaft

41、s or axle tubes, seal the housingopenings. Use a stainless steel plumbing test plug for a 2.9 in. to 3.1 in. pipe diameter. McMasterCarr p/n 2908K2811,9 with theouter washer and seal ring cut to 74 mm to 79 mm (2.9 in. to 3.1 in.) has been found acceptable. Install a pair of seals in the axlehousing

42、 openings before installing carrier/case into the axle housing. When using Dana Model 30 hardware rather than the AAMK2XX hardware see Fig. A5.2 for an example of construction dimensions for fabricating a pair of suitable seals.6.2.6 Temperature Control System, Motoring PhaseDuring the motoring phas

43、e, the bulk oil temperature is sensed by aresistance temperature device (RTD) or thermocouple (J or K type). The controller switches on a pair of 250 W lamps or coolingfan, or both, that are directed toward the differential as needed to control bulk oil temperature at 180 F 6 1 F (82 C 6 6 C).A hous

44、ehold-type electric fan having 12.0 in. (310 mm) diameter blades has been shown to provide acceptable cooling capability.Fig. A5.3 shows an example of the location of the heat lamp pair and the cooling fan. Fig. A5.4 shows the location of thetemperature sensor in the differential housing.6.2.7 Stora

45、ge Box and Temperature Control System, Storage PhaseDuring the storage phase of the test, a double-walledaluminum or stainless steel box covers the differential housing assembly. An RTD or thermocouple (J or K type) in conjunctionwith the controller regulates heat input from four strip heaters givin

46、g a total output of 1700 Btuh (500 W). A small electric motor6 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 Cust

47、omer Service at serviceastm.org.8 The sole source of supply of the apparatus known to the committee at this time is American Axle Manufacturing, 2965 Technology Dr., Rochester Hills, MI 48309.9 If you are aware of alternative suppliers, please provide this information to ASTM International Headquart

48、ers. Your comments will receive careful consideration at ameeting of the responsible technical committee,1 which you may attend.10 The sole source of supply of the apparatus known to the committee at this time isAPServices Inc., 203Armstrong Drive, Northpoint Industrial Park, Freeport, PA16229.Reque

49、st ASTM L-33-1 Die.11 The sole source of supply of the apparatus known to the committee at this time is McMaster-Carr Supply Company, 200Aurora Industrial Pkwy, Cleveland, OH 44202.D7038 18a3turns a fabricated impeller at 1700 rmin 6 100 rmin to provide air circulation within the box. Dayton part number 3M562available from Grainger has been found suitable for this purpose.12,9 Control the bulk oil temperature at 125 F 6 1 F (52 C 66 C). Fig. A5.5 shows details of the impeller. Fig. A5.6 shows construction and electrical details of this