ASTM D7038-09a
(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.
1.2.1 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D7038–09a
Standard Test Method for
Evaluation of Moisture Corrosion Resistance of Automotive
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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 for the definitions in 12.2, and for SI units where there are no
direct inch-pounds equivalent units.
1.1 This test method covers a test procedure for evaluating
1.3 This standard does not purport to address all of the
the rust and corrosion inhibiting properties of a gear lubricant
safety concerns, if any, associated with its use. It is the
while subjected to water contamination and elevated tempera-
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responsibility of the user of this standard to establish appro-
tureinabench-mountedhypoiddifferentialhousingassembly.
priate safety and health practices and determine the applica-
This test method is commonly referred to as the L-33-1 test.
bility of regulatory limitations prior to use.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
2. Referenced Documents
conversions to SI units that are provided for information only
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2.1 ASTM Standard:
and are not considered standard.
D235 Specification for Mineral Spirits (Petroleum Spirits)
1.2.1 Exceptions—(1) where there is no direct SI equivalent
(Hydrocarbon Dry Cleaning Solvent)
such as screw threads and national pipe threads/diameters, and
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2.2 Society of Automotive Engineers Standards:
(2) the values stated in SI units are to be regarded as standard
J308 Information Report onAxle and Manual Transmission
Lubricants
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This test method is under the jurisdiction of ASTM Committee D02 on
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
Use
D02.B0 on Automotive Lubricants.
Current edition approved Oct. 1, 2009. Published November 2009. Originally
approved in 2004. Last previous edition approved in 2009 as D7038–09. DOI:
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10.1520/D7038-09a. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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Until the next revision of this test method, the ASTM Test Monitoring Center contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(TMC) will update changes in this test method by means of Information Letters. Standards volume information, refer to the standard’s Document Summary page on
This edition includes all Information Letters through 09–01. Information Letters the ASTM website.
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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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D7038–09a
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2.3 U.S. Military Specifications: 4.5 Inspection—At the end of the storage phase, the test is
MIL-PRF-2105E Lubricating Oil, Gear, General Multipur- complete. Drain the differential assembly, disassemble, and
pose rate for rust, stain, and other deposits.
MIL-P-3420F NOX-RUST Paper
5. Significance and Use
3. Terminology
5.1 This test simulates a type of severe field service in
which corrosion-promoting moisture in the form of condensed
3.1 Definitions of Terms Specific to This Standard:
water vapor accumulates in the axle assembly. This may
3.1.1 corrosion, n—an alteration of a finished metal surface
happen as a result of volume expansion and contraction of the
by discoloration, accompanied by roughening not attributable
axle lubricant and the accompanied breathing in of moisture-
to mechanical action.
laden air through the axle vent. The test screens lubricants for
3.1.2 downtime, n—an interruption of power to the test unit
their ability to prevent the expected corrosion.
for a period greater than ten seconds.
5.2 The test method described in this standard may be used
3.1.3 rust, n—a special case of corrosion, which always
by any properly equipped laboratory, without the assistance of
deteriorates or alters the original surface condition.
anyone not associated with that laboratory. However, the
3.1.3.1 Discussion—Rust always has color (usually, but not
ASTM Test Monitoring Center (TMC) provides reference oils
limited to red, yellow, brown, black) and one of the following
and an assessment of the test results obtained on those oils by
descriptive characteristics: (1) depth; the rusted surface is built
the laboratory (se
...
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