ASTM_D_6547_-_16.pdf

Designation:D654716Standard 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 year 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.Scope*1.1 This test method covers the corrosiveness of hydraulicand lubricating fluids to a bimetallic galvanic couple.NOTE1This 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.1.2.1 ExceptionThe values given in parentheses are forinformation only.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.Referenced Documents2.1 ASTM Standards:2A322 Specification for Steel Bars,Alloy,Standard Grades2.2 Federal Standards:FED-STD-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 steel 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 fluids.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,10 power.5.3 Glass Stirring Rod.5.4 Abrasive Papers,silicon-carbide or aluminum oxide(150,240,400,600 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 intended 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,concentrated,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 sulfuric 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 the1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.N0 on Hydraulic Fluids.Current edition approved Jan.1,2016.Published February 2016.Originallyapproved in 2000.Last previous edition approved in 2010 as D6547 00(2010).DOI:10.1520/D6547-16.2For 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 page onthe ASTM website.3Available online at ASSIST Quicksearch(http:/quicksearch.dla.mil).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 you 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,AmericanChemical 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),Rockville,MD.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 concentrated nitric acid(225 mL).Continue stirring after acidaddition until the solution has cooled to room temperature,andthen add concentrated hydrochloric acid(8 mL).Allow themixture to equilibrate to room temperature before use.(WarningNitric,hydrochloric,and sulfuric acids are verycorrosive.Nitric acid and s