ASTM D7038-13
(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
5.1 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.
5.2 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.
5.3 The L-33-1 test procedure is used or referred to in the following documents: ASTM Publication STP-512A,8 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.2 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.
1.2.1 Exceptions—(1) where there is no direct SI equivalent such as screw threads and national pipe 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 direct inch-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 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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Designation: D7038 − 13
StandardTest Method for
Evaluation of Moisture Corrosion Resistance of Automotive
1
Gear Lubricants
This standard is issued under the fixed designation D7038; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
4
1. Scope* 2.2 Society of Automotive Engineers Standards:
J308Information Report on Axle and Manual Transmission
1.1 This test method covers a test procedure for evaluating
Lubricants
the rust and corrosion inhibiting properties of a gear lubricant
J2360Lubricating Oil, Gear Multipurpose (Metric) Military
while subjected to water contamination and elevated tempera-
2 Use
tureinabench-mountedhypoiddifferentialhousingassembly.
5
2.3 U.S. Military Specifications:
This test method is commonly referred to as the L-33-1 test.
MIL-PRF-2105ELubricating Oil, Gear, General Multipur-
1.2 The values stated in inch-pound units are to be regarded
pose
as standard. The values given in parentheses are mathematical
MIL-P-3420FNOX-RUST Paper
conversions to SI units that are provided for information only
3. Terminology
and are not considered standard.
1.2.1 Exceptions—(1) where there is no direct SI equivalent
3.1 Definitions of Terms Specific to This Standard:
such as screw threads and national pipe threads/diameters, and
3.1.1 corrosion, n—an alteration of a finished metal surface
(2) the values stated in SI units are to be regarded as standard
by discoloration, accompanied by roughening not attributable
for the definitions in 12.2, and for SI units where there are no
to mechanical action.
direct inch-pounds equivalent units.
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
descriptive characteristics: (1) depth; the rusted surface is built
2. Referenced Documents
up relative to that of adjacent areas. (2) texture; the surface
3
2.1 ASTM Standard:
may appear to be etched, scaly or otherwise visibly different
D235Specification for Mineral Spirits (Petroleum Spirits)
than adjacent areas.
(Hydrocarbon Dry Cleaning Solvent)
3.1.4 stain, n—a surface modification that is attributable to
discoloration only.
1
This test method is under the jurisdiction of ASTM Committee D02 on
4. Summary of Test Method
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.B0 on Automotive Lubricants.
4.1 This procedure utilizes a Dana Corporation Model 30
Current edition approved May 1, 2013. Published May 2013. Originally
hypoid differential assembly, Part No. 27770–1X, 4:10 ratio,
approved in 2004. Last previous edition approved in 2010 as D7038–10. DOI:
10.1520/D7038-13.
standard differential with uncoated ring and pinion, without
2
6,7
Until the next revision of this test method, the ASTM Test Monitoring Center
axle tubes.
(TMC) will update changes in this test method by means of Information Letters.
This edition includes all Information Letters through 09–02. Information Letters
4
may be obtained from the ASTM TMC, 6555 Penn Ave., Pittsburgh, PA 15206- Available from Society of Automotive Engineers (SAE), 400 Commonwealth
4489, Attention: Administrator. The TMC is also the source of reference oils.
Dr., Warrendale, PA 15096-0001.
3 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from the Defense Printing Service Office, 700 Robbins Ave., Bldg.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4D, Philadelphia, PA 19111-5094.
6
Standards volume information, refer to the standard’s Document Summary page on The sole source of supply of the apparatus known to the committee at this time
the ASTM website. is SpicerAxle Division, Dana Corporation, P.O. Box 1209, Fort Wayne, IN 46801.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7038 − 13
4.2 Test Unit Preparation—Prior to each test, completely 6. Apparatus
disassemble and clean the new differential housing assembly.
6.1 Labor
...
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. 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.
Designation: D7038 − 10 D7038 − 13
Standard Test Method for
Evaluation of Moisture Corrosion Resistance of Automotive
1
Gear Lubricants
This standard is issued under the fixed designation D7038; 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 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.
1.2.1 Exceptions—(1) where there is no direct SI equivalent such as screw threads and national pipe 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 direct
inch-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 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:
D235 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
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.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.B0 on
Automotive Lubricants.
Current edition approved Oct. 1, 2010May 1, 2013. Published November 2010May 2013. Originally approved in 2004. Last previous edition approved in 20092010 as
D7038D7038 – 10.–09a. DOI: 10.1520/D7038-10.10.1520/D7038-13.
2
Until the next revision of this test method, the ASTM Test Monitoring Center (TMC) will update changes in this test method by means of Information Letters. This edition
includes all Information Letters through 09–02. 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 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.
4
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.
5
Available from the Defense Printing Service Office, 700 Robbins Ave., Bldg. 4D, Philadelphia, PA 19111-5094.
3.1.3.1 Discussion—
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7038 − 13
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
di
...
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