ASTM D6547-00(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6547–00 (Reapproved 2005)
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. 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 It is an indicator of the compatibility of a fluid with a brass on
steel galvanic couple at ambient temperature and 50 % 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,103 power.
1.2 The values stated in SI units are to be regarded as
5.3 Glass Stirring Rod.
standard. The values given in parentheses are for information
5.4 Abrasive Papers, silicon-carbide or aluminum oxide
only.
(150, 240, 400, 600 grit, one sheet per disk).
1.3 This standard does not purport to address all of the
5.5 Cloth, lint-free, clean, dry.
safety concerns, if any, associated with its use. It is the
5.6 ChromiumAlloy Steel Disks,threeforeachtestsample.
responsibility of the user of this standard to establish appro-
5.7 Brass Clips, three for each test sample.
priate safety and health practices and determine the applica-
6. Reagents and Materials
bility of regulatory limitations prior to use.
6.1 Purity of Reagents—Reagent grade chemicals shall be
2. Referenced Documents
used in all tests. Unless otherwise indicated, it is intended that
2.1 ASTM Standards:
all reagents conform to the Committee onAnalytical Reagents
A322 Specification for Steel Bars, Alloy, Standard Grades
of the American Chemical Society where such specifications
2.2 Federal Standards:
are available.
Fed-Std No. 791, Method 5322.2 Corrosiveness of Oil on a
6.2 Etching Solution, consisting of distilled water, 450 mL;
Bimetallic Couple
nitric acid, concentrated, 225 mL; sulfuric acid, concentrated,
300 mL; and hydrochloric acid, concentrated, 8 mL.
3. Summary of Test Method
6.2.1 To avoid hazardous reactions when preparing the
3.1 This test method consists of fitting a brass clip to the
etching solution, place the distilled water (450 mL) in a 1.5-L,
fluid-coated surface of a steel disk, storing the assembly at
or larger, glass beaker set in a container of ice and water. Stir
approximately 50 % relative humidity for ten days, and visu-
with a glass mechanical stirrer or plastic coated magnetic spin
ally inspecting the assembly for evidence of galvanic corro-
bar while slowly adding concentrated sulfuric acid (300 mL).
sion.
Add more ice to the cooling bath as needed. When acid
addition is complete, continue stirring until the solution has
4. Significance and Use
cooled to room temperature, and then start slow addition of the
4.1 Corrosiveness of a fluid to a bimetallic couple is one of
concentrated nitric acid (225 mL). Continue stirring after acid
the properties used to evaluate hydraulic or lubricating fluids.
addition until the solution has cooled to room temperature, and
This test method is under the jurisdiction of ASTM CommitteeD02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee The sole source of supply of the apparatus known to the committee at this time
D02.N0 on Hydraulic Fluids. is Metaspec, 790 W. Mayfield Rd., San Antonio, TX 78211. If you are aware of
Current edition approved May 1, 2005. Published June 2005. Originally alternative suppliers, please provide this information to ASTM International
approved in 2000. Last previous edition approved in 2000 as D6547–00. DOI: Headquarters.Your comments will receive careful consideration at a meeting of the
10.1520/D6547-00R05. 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 service@astm.org. 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 (2005)
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.
6.3 Acetone, technical grade. (Warning—Flammable. If a visible stain remains on the clip in the area that will be in
Health hazard.) contact with the disk, repeat the etching process for an
6.4 Distilled Water. additional 20 s with fresh etching solution. Change etching
solution and acetone every six clips. Allow the clip to air dry
NOTE 2—Both distilled and deionized water were
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