ASTM D6547-00(2010)

Standard Test Method for Corrosiveness of Lubricating Fluid to Bimetallic Couple

SIGNIFICANCE AND USE
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. 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 health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Sep-2010
• ICS: 75.120 - Hydraulic fluids
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants

Relations

• Replaces: ASTM D6547-00(2005) - Standard Test Method for Corrosiveness of Lubricating Fluid to Bimetallic Couple
• Effective Date: 01-Oct-2010
• Replaced By: ASTM D6547-16 - Standard Test Method for Corrosiveness of Lubricating Fluid to Bimetallic Couple
• Effective Date: 01-Jan-2016

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6547 − 00(Reapproved 2010)
Standard Test Method for
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope It is an indicator of the compatibility of a fluid with a brass on
steelgalvaniccoupleatambienttemperatureand50%relative
1.1 This test method covers the corrosiveness of hydraulic
humidity.
and lubricating fluids to a bimetallic galvanic couple.
NOTE 1—This test method replicates Fed-Std No. 791, Method 5322.2.
5. Apparatus
It utilizes the same apparatus, test conditions, and evaluation criteria, but
5.1 Desiccating Jars, two.
it describes test procedures more explicitly.
5.2 Magnifier, 10× power.
1.2 The values stated in SI units are to be regarded as
standard. The values given in parentheses are for information
5.3 Glass Stirring Rod.
only.
5.4 Abrasive Papers, silicon-carbide or aluminum oxide
1.3 This standard does not purport to address all of the
(150, 240, 400, 600 grit, one sheet per disk).
safety concerns, if any, associated with its use. It is the
5.5 Cloth, lint-free, clean, dry.
responsibility of the user of this standard to establish appro-
5.6 ChromiumAlloy Steel Disks,threeforeachtestsample.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.7 Brass Clips, three for each test sample.
2. Referenced Documents
6. Reagents and Materials
2.1 ASTM Standards:
6.1 Purity of Reagents—Reagent grade chemicals shall be
A322Specification for Steel Bars, Alloy, Standard Grades
used in all tests. Unless otherwise indicated, it is intended that
2.2 Federal Standards:
all reagents conform to the Committee onAnalytical Reagents
Fed-Std No. 791, Method 5322.2Corrosiveness of Oil on a
of the American Chemical Society where such specifications
Bimetallic Couple 5
are available.
6.2 Etching Solution, consisting of distilled water, 450 mL;
3. Summary of Test Method
nitric acid, concentrated, 225 mL; sulfuric acid, concentrated,
3.1 This test method consists of fitting a brass clip to the
300 mL; and hydrochloric acid, concentrated, 8 mL.
fluid-coated surface of a steel disk, storing the assembly at
6.2.1 To avoid hazardous reactions when preparing the
approximately 50% relative humidity for ten days, and visu-
etching solution, place the distilled water (450 mL) in a 1.5-L,
ally inspecting the assembly for evidence of galvanic corro-
or larger, glass beaker set in a container of ice and water. Stir
sion.
with a glass mechanical stirrer or plastic coated magnetic spin
bar while slowly adding concentrated sulfuric acid (300 mL).
4. Significance and Use
Add more ice to the cooling bath as needed. When acid
4.1 Corrosiveness of a fluid to a bimetallic couple is one of
addition is complete, continue stirring until the solution has
the properties used to evaluate hydraulic or lubricating fluids.
cooledtoroomtemperature,andthenstartslowadditionofthe
This test method is under the jurisdiction of ASTM CommitteeD02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of The sole source of supply of the apparatus known to the committee at this time
Subcommittee D02.N0.02 on Industrial Applications. is Metaspec, 790 W. Mayfield Rd., San Antonio, TX 78211. If you are aware of
Current edition approved Oct. 1, 2010. Published November 2010. Originally alternative suppliers, please provide this information to ASTM International
approved in 2000. Last previous edition approved in 2005 as D6547–00(2005). Headquarters.Your comments will receive careful consideration at a meeting of the
DOI: 10.1520/D6547-00R10. responsible technical committee, which you may attend.
2 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Reagent Chemicals, American Chemical Society Specifications, American
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Chemical Society, Washington, DC. For Suggestions on the testing of reagents not
Standards volume information, refer to the standard’s Document Summary page on listed by the American Chemical Society, see Annual Standards for Laboratory
the ASTM website. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Available from Standardization Documents Order Desk, Building 4 Section D, and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
700 Robbins Avenue, Philadelphia, PA 19111–5904, Attn: NPODS. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6547 − 00 (2010)
concentrated nitric acid (225 mL). Continue stirring after acid 7.2 Foreachtestfluid,preparethreebrassclips.Thesebrass
additionuntilthesolutionhascooledtoroomtemperature,and clips may either be new or from a previous test.
then add concentrated hydrochloric acid (8 mL). Allow the 7.2.1 The clips shall consist of a QQ-B-613, composition 2
mixture to equilibrate to room temperature before use. brass, spring temper, fabricated to the dimensions shown in
(Warning—Nitric, hydrochloric, and sulfuric acids are very Fig. 1.
corrosive.Nitricacidandsulfuricacidarealsooxidizingacids. 7.2.2 Place 150 mLof etching solution in a 250-mLbeaker.
The analyst should prepare the etching solution in a well- Immerse the brass clips in etching solution for 20 s. Remove
ventilated hood and wear appropriate gloves, apron, and face the clip from the etching solution and immediately wash
shield.) successivelyincoldrunningwater,distilledwater,andacetone.
If a visible stain remains on the clip in the area that will be in
6.3 Acetone, technical grade. (Warning—Flammable.
contact with the disk, repeat the etching process for an
Health hazard.)
additional 20 s with fresh etching solution. Change etching
6.4 Distilled Water.
solution and acetone every six clips. Allow the clip to air dry
NOTE
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