ASTM_D_7671_-_10_2015.pdf

Designation:D767110(Reapproved 2015)Standard Test Method forCorrosiveness to Silver by Automotive SparkIgnitionEngine FuelSilver Strip Method1This standard is issued under the fixed designation D7671;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.Scope1.1 This test method covers the determination of the corro-siveness to silver by automotive spark-ignition engine fuel,asdefined by Specification D4814,or similar specifications inother jurisdictions,having a vapor pressure no greater than124 kPa(18 psi)at 37.8 C(100 F),by one of two procedures.Procedure A involves the use of a pressure vessel,whereasProcedure B involves the use of a vented test tube.1.2 The result of the test is based on a visual rating that isclassified as an integer in the range from 0 to 4 as defined inTable 1.1.3 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.4 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.For specificwarning statements,see 6.1 and Section 7.2.Referenced Documents2.1 ASTM Standards:2D130 Test Method for Corrosiveness to Copper from Petro-leum Products by Copper Strip TestD3241 Test Method for Thermal Oxidation Stability ofAviation Turbine FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4814 Specification for Automotive Spark-Ignition EngineFuelE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 Energy Institute Standard:IP 227 Determination of Corrosiveness to Silver of AviationTurbine FuelsSilver Strip Method32.3 ASTM Adjuncts:Color Standard for Tube Deposit Rating43.Summary of Test Method3.1 This test method covers two procedures.Procedure Ainvolves the use of a pressure vessel(to prevent the loss ofvolatile components in the sample),whereas Procedure Binvolves the use of a vented test tube.In both procedures,afreshly polished silver strip is suspended in 30 mL of samplewhich is heated to 50 C 6 1 C for a duration of 3 h 6 5 min.At the end of the heating period,the silver strip is removed,washed and the color and tarnish level assessed against therequirements in Table 1.4.Significance and Use4.1 Crude petroleum contains sulfur compounds,most ofwhich are removed during refining.However,of the sulfurcompounds remaining in the petroleum product,some can havea corroding action on various metals and this corrosivity is notrelated to the total sulfur content.In addition,fuels can becomecontaminated by corrosive sulfur compounds during storageand distribution.The corrosive effect can vary according to thechemical types of sulfur compounds present.4.2 The silver strip corrosion test is designed to assess therelative degree of corrosivity of a petroleum product towardssilver and silver alloys.4.3 Reactive sulfur compounds present in automotive spark-ignition engine fuels under some circumstances can corrode ortarnish silver alloy fuel gauge in-tank sender units(andsilver-plated bearings in some 2-stroke cycle engines).Tominimize or prevent the failure of silver alloy in-tank sender1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and are the direct responsibilityof Subcommittee D02.05.0C on Color and Reactivity.Current edition approved Oct.1,2015.Published December 2015.Originallyapproved in 2010.Last previous edition approved in 2010 as D7671 101.DOI:10.1520/D7671-10R15.2For 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.3Withdrawn without replacement in 2001.Copies of IP 227/99 can be obtainedat The Publications Department,Energy Institute,61 New Cavendish Street,London,W1G 7AR,United Kingdom.4Available from ASTM International Headquarters.Order Adjunct No.ADJD3241.Original adjunct produced in 1986.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 units by corrosion or tarnish,Specification D4814 requires thatfuels shall pass the silver strip corrosion test.5.Apparatus5.1 Silver Strip Corrosion Pressure Vessel(Procedure A),constructed from stainless steel or similar strong and non-corroding metallurgy according to the dimensions as given inFig.1,that is the apparatus described in Test Method D130.The vessel shall be capable of withstanding a test pressure of700 kPa gauge(100 psi).5.1