ASTM D7038-08
(Test Method)Standard Test Method for Evaluation of Moisture Corrosion Resistance of Automotive Gear Lubricants
Standard Test Method for Evaluation of Moisture Corrosion Resistance of Automotive Gear Lubricants
SIGNIFICANCE AND USE
This test simulates a type of severe field service in which corrosion-promoting moisture in the form of condensed water vapor accumulates in the axle assembly. This may happen as a result of volume expansion and contraction of the axle lubricant and the accompanied breathing in of moisture-laden air through the axle vent. The test screens lubricants for their ability to prevent the expected corrosion.
The test method described in this standard may be used by any properly equipped laboratory, without the assistance of anyone not associated with that laboratory. However, the ASTM Test Monitoring Center (TMC) provides reference oils and an assessment of the test results obtained on those oils by the laboratory (see Annex A7). By this means, the laboratory will know whether their use of the test method gives results statistically similar to those obtained by other laboratories. Furthermore, various agencies require that a laboratory utilize the TMC services in seeking qualification of oils against specifications. For example, the U.S. Army imposes such a requirement in connection with several Army lubricating oil specifications.
The L-33-1 test procedure is used or referred to in the following documents: ASTM Publication STP-512A, SAE J308, SAE J2360, and U.S. Military Specification MIL-PRF-2105E.
SCOPE
1.1 This test method covers a test procedure for evaluating the rust and corrosion inhibiting properties of a gear lubricant while subjected to water contamination and elevated temperature in a bench-mounted hypoid differential housing assembly. This test method is commonly referred to as the L-33-1 test.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation:D7038–08
Standard Test Method for
Evaluation of Moisture Corrosion Resistance of Automotive
1
Gear Lubricants
This standard is issued under the fixed designation D 7038; 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 (ϵ) indicates an editorial change since the last revision or reapproval.
5
1. Scope 2.3 U.S. Military Specifications:
MIL-PRF-2105E Lubricating Oil, Gear, General Multipur-
1.1 This test method covers a test procedure for evaluating
pose
the rust and corrosion inhibiting properties of a gear lubricant
MIL-P-3420F NOX-RUST Paper
while subjected to water contamination and elevated tempera-
2
tureinabench-mountedhypoiddifferentialhousingassembly.
3. Terminology
This test method is commonly referred to as the L-33-1 test.
3.1 Definitions of Terms Specific to This Standard:
1.2 The values stated in inch-pound units are to be regarded
3.1.1 corrosion, n—an alteration of a finished metal surface
as standard. The values given in parentheses are mathematical
by discoloration, accompanied by roughening not attributable
conversions to SI units that are provided for information only
to mechanical action.
and are not considered standard.
3.1.2 downtime, n—an interruption of power to the test unit
1.3 This standard does not purport to address all of the
for a period greater than ten seconds.
safety concerns, if any, associated with its use. It is the
3.1.3 rust, n—a special case of corrosion, which always
responsibility of the user of this standard to establish appro-
deteriorates or alters the original surface condition.
priate safety and health practices and determine the applica-
3.1.3.1 Discussion—Rust always has color (usually, but not
bility of regulatory limitations prior to use.
limited to red, yellow, brown, black) and one of the following
2. Referenced Documents descriptive characteristics: (1) depth; the rusted surface is built
3
up relative to that of adjacent areas. (2) texture; the surface
2.1 ASTM Standard:
may appear to be etched, scaly or otherwise visibly different
D 235 Specification for Mineral Spirits (Petroleum Spirits)
than adjacent areas.
(Hydrocarbon Dry Cleaning Solvent)
4
3.1.4 stain, n—a surface modification that is attributable to
2.2 Society of Automotive Engineers Standards:
discoloration only.
J308 Information Report onAxle and Manual Transmission
Lubricants
4. Summary of Test Method
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military
4.1 This procedure utilizes a Dana Corporation Model 30
Use
hypoid differential assembly, Part No. 27770–1X, 4:10 ratio,
standard differential with uncoated ring and pinion, without
6,7
1
axle tubes.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee 4.2 Test Unit Preparation—Prior to each test, completely
D02.B0 on Automotive Lubricants.
disassemble and clean the new differential housing assembly.
Current edition approved May 1, 2008. Published May 2008. Originally
Discard the axle spacer block. Abrasive blast all rated parts
approved in 2004. Last previous edition approved in 2007 as D 7038–07a.
2
Until the next revision of this test method, the ASTM Test Monitoring Center (exceptbearingsandcups).Disassembleallbearingsfromtheir
(TMC) will update changes in this test method by means of Information Letters.
mating parts prior to abrasive blasting. Coat all internal parts
This edition includes all Information Letters through 07–03. Information Letters
may be obtained from the ASTM TMC, 6555 Penn Ave., Pittsburgh, PA 15206-
5
4489, Attention: Administrator. The TMC is also the source of reference oils. Available from the Defense Printing Service Office, 700 Robbins Ave., Bldg.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4D, Philadelphia, PA 19111-5094.
6
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM If you are aware of alternative suppliers, please provide this information to
Standards volume information, refer to the standard’s Document Summary page on ASTM International Headquarters. Your comments will receive careful consider-
1
the ASTM website. ation at a meeting of the responsible technical committee, which you may attend.
4 7
Available from Society of Automotive Engineers (SAE), 400 Commonwealth The sole source of supply of the apparatus known to the committee at this time
Dr., Warrendale, PA 15096-0001. is Spicer Axle Division, Dana Corporation, P.O. Box 1209, Fort Wayne, IN 46801.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it 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 current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard
Designation:D7038–08
Standard Test Method for
Evaluation of Moisture Corrosion Resistance of Automotive
1
Gear Lubricants
This standard is issued under the fixed designation D 7038; 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.
1. Scope
1.1 This test method covers a test procedure for evaluating the rust and corrosion inhibiting properties of a gear lubricant while
2
subjected to water contamination and elevated temperature in a bench-mounted hypoid differential housing assembly. This test
method is commonly referred to as the L-33-1 test.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 ASTM Standard:
D 235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
4
2.2 Society of Automotive Engineers Standards:
J308 Information Report on Axle and Manual Transmission Lubricants
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use
1
This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.B0 on
Automotive Lubricants.
Current edition approved May 1, 2008. Published May 2008. Originally approved in 2004. Last previous edition approved in 2007 as D 7038–07a.
2
Untilthenextrevisionofthistestmethod,theASTMTestMonitoringCenter(TMC)willupdatechangesinthistestmethodbymeansofInformationLetters.Thisedition
includes all Information Letters through 07–03. 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.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
4
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D7038–08
5
2.3 U.S. Military Specifications:
MIL-PRF-2105E Lubricating Oil, Gear, General Multipurpose
MIL-P-3420F NOX-RUST Paper
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 corrosion, n—an alteration of a finished metal surface by discoloration, accompanied by roughening not attributable to
mechanical action.
3.1.2 downtime, n—an interruption of power to the test unit for a period greater than ten seconds.
3.1.3 rust, n—a special case of corrosion, which always deteriorates or alters the original surface condition.
3.1.3.1 Discussion—Rust always has color (usually, 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, scaly or otherwise visibly different than adjacent areas.
3.1.4 stain, n—a surface modification that is attributable to discoloration only.
4. Summary of Test Method
4.1 This procedure utilizes a Dana Corporation Model 30 hypoid differential assembly, Part No. 27770–1X, 4:10 ratio, standard
,
6 7
differential with uncoated ring and pinion, without axle tubes.
4.2 Test Unit Preparation—Prior to each test, completely disassemble and clean the new differential housing assembly. Discard
the axle spacer block. Abrasive blast all rated parts (except bearings and cups). Disassemble all bearings from their mating parts
prior to abrasive blasting. Coat all internal parts and rated surfaces with test oil. Reassemble the unit to test specification values.
Install the unit on the motoring rig and then connect an oil temperature monitoring probe and a drive shaft. Plac
...
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