ASTM D6547-23
(Test Method)Standard Test Method for Corrosiveness of Lubricating Fluid to Bimetallic Couple
Standard Test Method for Corrosiveness of Lubricating Fluid to Bimetallic Couple
SIGNIFICANCE AND USE
5.1 Corrosiveness of a fluid to a bimetallic couple is one of the properties used to evaluate hydraulic or lubricating fluids. It is an indicator of the compatibility of a fluid with a brass on steel galvanic couple at ambient temperature and 50 % relative humidity.
SCOPE
1.1 This test method covers the corrosiveness of hydraulic and lubricating fluids to a bimetallic galvanic couple.
Note 1: This test method replicates Fed-Std No. 791, Method 5322.2. It utilizes the same apparatus, test conditions, and evaluation criteria, but it describes test procedures more explicitly.
1.2 The values stated in SI units are to be regarded as standard.
1.2.1 Exception—The values given in parentheses are for information only.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6547 − 23
Standard Test Method for
1
Corrosiveness of Lubricating Fluid to Bimetallic Couple
This standard is issued under the fixed designation D6547; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 3. Terminology
3.1 Definitions:
1.1 This test method covers the corrosiveness of hydraulic
and lubricating fluids to a bimetallic galvanic couple. 3.1.1 For definitions of terms used in this test method, refer
to Terminology D4175.
NOTE 1—This test method replicates Fed-Std No. 791, Method 5322.2.
It utilizes the same apparatus, test conditions, and evaluation criteria, but
4. Summary of Test Method
it describes test procedures more explicitly.
1.2 The values stated in SI units are to be regarded as
4.1 This test method consists of fitting a brass clip to the
standard.
fluid-coated surface of a steel disk, storing the assembly at
1.2.1 Exception—The values given in parentheses are for
approximately 50 % relative humidity for ten days, and visu-
information only.
ally inspecting the assembly for evidence of galvanic corro-
sion.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.1 Corrosiveness of a fluid to a bimetallic couple is one of
mine the applicability of regulatory limitations prior to use.
the properties used to evaluate hydraulic or lubricating fluids.
1.4 This international standard was developed in accor-
It is an indicator of the compatibility of a fluid with a brass on
dance with internationally recognized principles on standard-
steel galvanic couple at ambient temperature and 50 % relative
ization established in the Decision on Principles for the
humidity.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
6. Apparatus
Barriers to Trade (TBT) Committee.
6.1 Desiccating Jars, two.
2. Referenced Documents 6.2 Magnifier, 10× power.
2
2.1 ASTM Standards: 6.3 Glass Stirring Rod.
A322 Specification for Steel Bars, Alloy, Standard Grades
6.4 Abrasive Papers, silicon-carbide or aluminum oxide
D4175 Terminology Relating to Petroleum Products, Liquid
(150, 240, 400, 600 grit, one sheet per disk).
Fuels, and Lubricants
6.5 Cloth, lint-free, clean, dry.
2.2 Federal Standards:
4
6.6 Chromium Alloy Steel Disks, three for each test sample.
FED-STD-791, Method 5322.2 Corrosiveness of Oil on a
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4
Bimetallic Couple
6.7 Brass Clips, three for each test sample.
7. Reagents and Materials
1
This test method is under the jurisdiction of ASTM Committee D02 on
7.1 Purity of Reagents—Reagent grade chemicals shall be
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
used in all tests. Unless otherwise indicated, it is intended that
Subcommittee D02.N0 on Hydraulic Fluids.
Current edition approved Dec. 15, 2023. Published December 2023. Originally
approved in 2000. Last previous edition approved in 2016 as D6547 – 16. DOI:
10.1520/D6547-23.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The sole source of supply of the apparatus known to the committee at this time
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM is Metaspec, 790 W. Mayfield Rd., San Antonio, TX 78211. If you are aware of
Standards volume information, refer to the standard’s Document Summary page on alternative suppliers, please provide this information to ASTM International
the ASTM website. Headquarters. Your comments will receive careful consideration at a meeting of the
3 1
Available online at ASSIST Quicksearch (http://quicksearch.dla.mil). responsible technical committee, which you may attend.
*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 ----------------------
D6547 − 23
all reagents conform to the Committee on Analytical Reagents to 1.0 in.) thick. Prior to initial use, the steel disk shall be
of the American Chemical Society where such specifications ground on one side to a 0.51 μm (20 μin.) rms. This treatment
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are available. need not be repeated pr
...
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: D6547 − 16 D6547 − 23
Standard Test Method for
1
Corrosiveness of Lubricating Fluid to Bimetallic Couple
This standard is issued under the fixed designation D6547; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This test method covers the corrosiveness of hydraulic and lubricating fluids to a bimetallic galvanic couple.
NOTE 1—This test method replicates Fed-Std No. 791, Method 5322.2. It utilizes the same apparatus, test conditions, and evaluation criteria, but it
describes test procedures more explicitly.
1.2 The values stated in SI units are to be regarded as standard.
1.2.1 Exception—The values given in parentheses are for information only.
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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A322 Specification for Steel Bars, Alloy, Standard Grades
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
2.2 Federal Standards:
3
FED-STD-791, Method 5322.2 Corrosiveness of Oil on a Bimetallic Couple
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.N0 on Hydraulic Fluids.
Current edition approved Jan. 1, 2016Dec. 15, 2023. Published February 2016December 2023. Originally approved in 2000. Last previous edition approved in 20102016
as D6547 – 00 (2010).D6547 – 16. DOI: 10.1520/D6547-16. 10.1520/D6547-23.
2
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.
3
Available online at ASSIST Quicksearch (http://quicksearch.dla.mil).
*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 ----------------------
D6547 − 23
4. Summary of Test Method
4.1 This test method consists of fitting a brass clip to the fluid-coated surface of a steel disk, storing the assembly at approximately
50 % relative humidity for ten days, and visually inspecting the assembly for evidence of galvanic corrosion.
5. Significance and Use
5.1 Corrosiveness of a fluid to a bimetallic couple is one of the properties used to evaluate hydraulic or lubricating fluids. It is
an indicator of the compatibility of a fluid with a brass on steel galvanic couple at ambient temperature and 50 % relative humidity.
6. Apparatus
6.1 Desiccating Jars, two.
6.2 Magnifier, 10× power.
6.3 Glass Stirring Rod.
6.4 Abrasive Papers, silicon-carbide or aluminum oxide (150, 240, 400, 600 grit, one sheet per disk).
6.5 Cloth, lint-free, clean, dry.
4
6.6 Chromium Alloy Steel Disks, three for each test sample.
4
6.7 Brass Clips, three for each test sample.
7. Reagents and Materials
7.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents conform to the Committee on Analytical Reagents of the American Chemical Society where such specifications are
5
available.
7.2 Etching Solution, consisting of distilled water, 450 mL; nitric acid, concentrated, 225 mL; sulfuric acid, concentrated, 300 mL;
and hydrochloric acid, concentrated, 8 mL.
7.2.1 To avoid hazardous reactions when preparing the etching solution, place the distilled water (450 mL) in a 1.5 L, or larger,
glass beaker set
...
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