1、Designation: D6547 00 (Reapproved 2010)Standard Test Method forCorrosiveness of Lubricating Fluid to Bimetallic Couple1This standard is issued under the fixed designation D6547; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the corrosiveness of hydraulicand lubricating fluids to a bimetallic galvanic couple.NO
3、TE 1This test method replicates Fed-Std No. 791, Method 5322.2.It utilizes the same apparatus, test conditions, and evaluation criteria, butit describes test procedures more explicitly.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses are for informatio
4、nonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Refere
5、nced Documents2.1 ASTM Standards:2A322 Specification for Steel Bars, Alloy, Standard Grades2.2 Federal Standards:Fed-Std No. 791, Method 5322.2 Corrosiveness of Oil on aBimetallic Couple33. Summary of Test Method3.1 This test method consists of fitting a brass clip to thefluid-coated surface of a st
6、eel disk, storing the assembly atapproximately 50 % relative humidity for ten days, and visu-ally inspecting the assembly for evidence of galvanic corro-sion.4. Significance and Use4.1 Corrosiveness of a fluid to a bimetallic couple is one ofthe properties used to evaluate hydraulic or lubricating f
7、luids.It is an indicator of the compatibility of a fluid with a brass onsteel galvanic couple at ambient temperature and 50 % relativehumidity.5. Apparatus5.1 Desiccating Jars, two.5.2 Magnifier,103 power.5.3 Glass Stirring Rod.5.4 Abrasive Papers, silicon-carbide or aluminum oxide(150, 240, 400, 60
8、0 grit, one sheet per disk).5.5 Cloth, lint-free, clean, dry.5.6 Chromium Alloy Steel Disks, three for each test sample.45.7 Brass Clips, three for each test sample.46. Reagents and Materials6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is in
9、tended thatall reagents conform to the Committee on Analytical Reagentsof the American Chemical Society where such specificationsare available.56.2 Etching Solution, consisting of distilled water, 450 mL;nitric acid, concentrated, 225 mL; sulfuric acid, concentrated,300 mL; and hydrochloric acid, co
10、ncentrated, 8 mL.6.2.1 To avoid hazardous reactions when preparing theetching solution, place the distilled water (450 mL) in a 1.5-L,or larger, glass beaker set in a container of ice and water. Stirwith a glass mechanical stirrer or plastic coated magnetic spinbar while slowly adding concentrated s
11、ulfuric acid (300 mL).Add more ice to the cooling bath as needed. When acidaddition is complete, continue stirring until the solution hascooled to room temperature, and then start slow addition of theconcentrated nitric acid (225 mL). Continue stirring after acidaddition until the solution has coole
12、d to room temperature, and1This test method is under the jurisdiction of ASTM CommitteeD02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.N0.02 on Industrial Applications.Current edition approved Oct. 1, 2010. Published November 2010. Originallyapproved in 20
13、00. Last previous edition approved in 2005 as D654700(2005).DOI: 10.1520/D6547-00R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary
14、page onthe ASTM website.3Available from Standardization Documents Order Desk, Building 4 Section D,700 Robbins Avenue, Philadelphia, PA 191115904, Attn: NPODS.4The sole source of supply of the apparatus known to the committee at this timeis Metaspec, 790 W. Mayfield Rd., San Antonio, TX 78211. If yo
15、u are aware ofalternative suppliers, please provide this information to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.5Reagent Chemicals, American Chemical Society Specifications, AmericanChem
16、ical Society, Washington, DC. For Suggestions on the testing of reagents notlisted by the American Chemical Society, see Annual Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rock
17、ville,MD.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.then add concentrated hydrochloric acid (8 mL). Allow themixture to equilibrate to room temperature before use.(WarningNitric, hydrochloric, and sulfuric acids are verycorrosiv
18、e. Nitric acid and sulfuric acid are also oxidizing acids.The analyst should prepare the etching solution in a well-ventilated hood and wear appropriate gloves, apron, and faceshield.)6.3 Acetone, technical grade. (WarningFlammable.Health hazard.)6.4 Distilled Water.NOTE 2Both distilled and deionize
19、d water were used in the roundrobin with no apparent impact on test outcome.6.5 Saturated Aqueous Solution, in contact with excesscalcium nitrate tetrahydrate.NOTE 3A saturated aqueous solution in contact with an excess ofCa(NO3)24H2O will produce 51 % relative humidity within a closedspace at 25C.
20、To prepare the saturated solution, dissolve 660 g ofCa(NO3)24H2O in 100 cc of water at 30C.66.6 Low-Erucic Rapeseed Oil, commercial grade.77. Test Specimen7.1 Gather reagents and materials before beginning speci-men preparation. The specimens must be prepared and as-sembled for testing on the same d
21、ay to reduce formation ofpassivating oxide films on the surface of the bimetallic couple.For each test fluid, prepare three steel disks. These steel disksmay either be new or from a previous test.7.1.1 The steel disks shall consist of a chromium alloy steelin accordance with Specification A322 (E521
22、00 or G52986),heat treated to Rockwell C-62. When new, the steel disks shallbe 25.4 mm (1.00 in.) in diameter by 13 to 25 mm (0.5 to 1.0in.) thick. Prior to initial use, the steel disk shall be ground onone side to a 0.51 m (20 in.) rms. This treatment need not berepeated prior to reuse.7.1.2 Polish
23、 the surface of the ground side using 150, 240,400, and 600-grit silicon carbide or aluminum oxide paper insuccession. Use one sheet of each per disk. Perform eachpolishing operation at right angles to the previous one, andcontinue until all the cross scratches from the previous opera-tion are remov
24、ed.NOTE 4Hand polishing techniques were used exclusively in the roundrobin evaluation of this test method. Mechanical polishing was notevaluated and may not yield equivalent results.7.1.3 Clean the disks by wiping with a clean, dry, lint-freecloth, being careful not to touch the polished surfaces wi
25、th barehands.7.1.4 Examine with a 103 power magnifier for discolora-tion, etching, pitting, or other signs of corrosion. Discard diskswith any signs of corrosion.7.1.5 Store the disks in a desiccator containing desiccantuntil time of use.7.2 For each test fluid, prepare three brass clips. These bras
26、sclips may either be new or from a previous test.7.2.1 The clips shall consist of a QQ-B-613, composition 2brass, spring temper, fabricated to the dimensions shown inFig. 1.7.2.2 Place 150 mL of etching solution in a 250-mL beaker.Immerse the brass clips in etching solution for 20 s. Removethe clip
27、from the etching solution and immediately washsuccessively in cold running water, distilled water, and acetone.If a visible stain remains on the clip in the area that will be incontact with the disk, repeat the etching process for anadditional 20 s with fresh etching solution. Change etchingsolution
28、 and acetone every six clips. Allow the clip to air dryand store it in the desiccator until ready for use. Be careful notto touch the surface that will be in contact with the steel diskswith bare hands.8. Procedure8.1 Remove the disks from the desiccator, being careful notto touch the finished surfa
29、ce.8.2 Using the stirring rod, place two drops of the test fluidalong a diameter in a line on the polished surface of each ofthree disks.8.3 Remove the brass clips from the desiccator, beingcareful not to touch the area to be in contact with the steeldisks.8.4 Place the clips on the disks as indicat
30、ed in Fig. 1 so thatthe center of the clip is in full contact with the wetted area ofthe disk.8.5 Place the assemblies in a covered desiccating jar con-taining the saturated aqueous Ca(NO3)24H2O solution for tendays (relative humidity approximately 50 %).8.6 Remove the assemblies from the desiccatin
31、g jar after tendays. Absorb excess fluid from the assemblies with a lint-freecloth. Using a sharp pencil, mark an outline of the clips wherethey are in contact with the polished surface of the disks.Remove the clips and wipe the disks clean with a lint-freecloth.6CRC Handbook of Chemistry and Physic
32、s, CRC Press, Inc., Boca Raton, FL,1993.7Low-erucic rapeseed oil may be used at the operators discretion as a failingreference fluid to monitor test severity.NOTE 1Dimensions in millimetres.NOTE 2Tolerance 60.8 mm.FIG. 1 Brass Clip DimensionsD6547 00 (2010)28.7 Using the 103 power magnifier, examine
33、 the marked-off area for discoloration, etching, pitting, or other signs ofcorrosion. Fig. 2 depicts galvanic corrosion stains typical oftests using low-erucic rapeseed oil as the failing referencefluid.9. Report9.1 Report the following information:9.1.1 Report the fluid as failing the test if the t
34、est areas ofmore than one disk show signs of corrosion, pitting, or otherattack. Also report the fluid as failing if two disks are free ofcorrosion, but the third shows more than three affected spots.9.1.1.1 Wipe the dish with a lint-free cloth. Rate thespecimen as passing if no discoloration or pit
35、ting is visible.9.1.2 Report the fluid as passing if the condition of the disksis other than these.10. Precision and Bias10.1 PrecisionIt is not practical to specify the precision ofthe procedure in this test method because the results of this testmethod are only intended to give a pass/fail rating
36、to the fluidbeing tested.10.2 BiasThe procedure in this test method has no biasbecause the value of corrosion-preventing characteristics isdefined only in terms of this test method.11. Keywords11.1 copper corrosion; corrosion; galvanic corrosion; hy-draulic fluidsASTM International takes no position
37、 respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.T
38、his standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM In
39、ternational Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address show
40、n below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 2 Appearance of Disks After Performing Testwith Low-erucic Rapeseed OilD6547 00 (2010)3
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