ASTM D6547-00

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An American National Standard
Designation:D6547–00
Standard Test Method for
Corrosiveness of Lubricating Fluid to Bimetallic Couple
This standard is issued under the fixed designation D 6547; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method covers the corrosiveness of hydraulic 5.1 Desiccating Jars, two.
and lubricating fluids to a bimetallic galvanic couple. 5.2 Magnifier, 10 x power.
5.3 Glass Stirring Rod.
NOTE 1—This test method replicates Fed-Std No. 791, Method 5322.2.
5.4 Abrasive Papers, silicon-carbide or aluminum oxide
It utilizes the same apparatus, test conditions, and evaluation criteria, but
(150, 240, 400, 600 grit, one sheet per disk).
it describes test procedures more explicitly.
5.5 Cloth, lint-free, clean, dry.
1.2 The values stated in SI units are to be regarded as the
5.6 ChromiumAlloy Steel Disks, three for each test sample.
standard. The values in parentheses are for information only.
5.7 Brass Clips, three for each test sample.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Reagents and Materials
responsibility of the user of this standard to establish appro-
6.1 Purity of Reagents—Reagent grade chemicals shall be
priate safety and health practices and determine the applica-
used in all tests. Unless otherwise indicated, it is intended that
bility of regulatory limitations prior to use.
all reagents conform to the Committee onAnalytical Reagents
of the American Chemical Society where such specifications
2. Referenced Documents
are available.
2.1 ASTM Standards:
6.2 Etching Solution, consisting of distilled water, 450 mL;
A 322 Specification for Steel Bars, Alloy, Standard Grades
nitric acid, concentrated, 225 mL; sulfuric acid, concentrated,
2.2 Federal Standards:
300 mL; and hydrochloric acid, concentrated, 8 mL.
Fed-Std No. 791, Method 5322.2 Corrosiveness of Oil on a
6.2.1 To avoid hazardous reactions when preparing the
Bimetallic Couple
etching solution, place the distilled water (450 mL) in a 1.5-L,
or larger, glass beaker set in a container of ice and water. Stir
3. Summary of Test Method
with a glass mechanical stirrer or plastic coated magnetic spin
3.1 This test method consists of fitting a brass clip to the
bar while slowly adding concentrated sulfuric acid (300 mL).
fluid-coated surface of a steel disk, storing the assembly at
Add more ice to the cooling bath as needed. When acid
approximately 50 % relative humidity for ten days, and visu-
addition is complete, continue stirring until the solution has
ally inspecting the assembly for evidence of galvanic corro-
cooled to room temperature, and then start slow addition of the
sion.
concentrated nitric acid (225 mL). Continue stirring after acid
addition until the solution has cooled to room temperature, and
4. Significance and Use
then add concentrated hydrochloric acid (8 mL). Allow the
4.1 Corrosiveness of a fluid to a bimetallic couple is one of
mixture to equilibrate to room temperature before use.
the properties used to evaluate hydraulic or lubricating fluids.
(Warning—Nitric, hydrochloric, and sulfuric acids are very
It is an indicator of the compatibility of a fluid with a brass on
corrosive. Nitric acid and sulfuric acid are also oxidizing acids.
steel galvanic couple at ambient temperature and 50 % relative
The analyst should prepare the etching solution in a well-
humidity.
ventilated hood and wear appropriate gloves, apron, and face
shield.)
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.N0.02 on Industrial Applications.
Current edition approved April 10, 2000. Published July 2000. Available from Metaspec, 790 W. Mayfield Rd., San Antonio, TX 78211.
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 Analar 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
6.3 Acetone, technical grade. (Warning—Flammable.
Health hazard.)
6.4 Distilled Water.
NOTE 2—Both distilled and deionized water were used in the round
robin with no apparent impact on test outcome.
6.5 Saturated Aqueous Solution, in contact with excess
calcium nitrate tetrahydrate.
NOTE 3—A saturated aqueous solution in contact with an excess of
Ca(NO )·4H O will produce 51 % relative humidity within a closed
3 2 2
space at 25°C. To prepare the saturated solution, dissolve 660 g of
Ca(NO )·4H O in 100 cc of water at 30°C.
3 2 2
6.6 Low-Erucic Rapeseed Oil, commercial grade.
7. Test Specimen
7.1 Gather reagents and materials before beginning speci-
men preparation. The specimens must be prepared and as-
sembled for testing on the same day to reduce formation of
NOTE 1—Dimensions in millimetres.
passivating oxide films on the surface of the bimetallic couple.
NOTE 2—Tolerance 60.8 mm.
For each test fluid, pr
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