ASTM D7038 - 15

    Standard Test Method for Evaluation of Moisture Corrosion Resistance of Automotive Gear Lubricants

    Active Standard ASTM D7038 | Developed by Subcommittee: D02.B0

    Book of Standards Volume: 05.04


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    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 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.

    1. 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    Society of Automotive Engineers Standards

    J308 Information Report on Axle and Manual Transmission Lubricants

    J2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use

    U.S. Military Specifications

    MIL-P-3420F NOX-RUST Paper

    MIL-PRF-2105E Lubricating Oil, Gear, General Multipurpose


    ICS Code

    ICS Number Code 75.100 (Lubricants, industrial oils and related products)

    UNSPSC Code

    UNSPSC Code 15121503(Gear oil)


    Referencing This Standard

    DOI: 10.1520/D7038-15

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D7038-15, Standard Test Method for Evaluation of Moisture Corrosion Resistance of Automotive Gear Lubricants, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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