1、Designation: D7667 102Standard Test Method forDetermination of Corrosiveness to Silver by AutomotiveSpark-Ignition Engine FuelThin Silver Strip Method1This standard is issued under the fixed designation D7667; the number immediately following the designation indicates the year oforiginal adoption or
2、, 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.1NOTEAdded legend to Fig. 1 editorially in July 2012.2NOTESubsection 7.4 was revised editor
3、ially in March 2014.1. Scope1.1 This test method covers the determination of the corro-siveness to silver by automotive spark-ignition engine fuel (forexample, gasoline), as defined by Specification D4814 orsimilar specifications in other jurisdictions, having a vaporpressure no greater than 124 kPa
4、 (18 psi) at 37.8C (100F) byone of two procedures.1.1.1 Procedure AInvolves the use of a pressure vessel.1.1.2 Procedure BInvolves the use of a vented test tube.1.2 The values stated in SI units are to be regarded as thestandard. The values in parentheses are for information only.1.3 WARNINGMercury
5、has been designated by manyregulatory agencies as a hazardous material that can causecentral nervous system, kidney and liver damage. Mercury, orits vapor, may be hazardous to health and corrosive tomaterials. Caution should be taken when handling mercury andmercury containing products. See the appl
6、icable product Ma-terial Safety Data Sheet (MSDS) for details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information. Users should be aware that selling mercuryand/or mercury containing products into your state or countrymay be prohibited by law.1.4 This standard does not purpor
7、t 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:2D130
8、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 Products
9、D4814 Specification for Automotive Spark-Ignition EngineFuelE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 Energy Institute Standards:3IP 227 Determination of Corrosiveness to Silver of AviationTurbine Fuels - Silver Strip Method2.3 ASTM Adjuncts:4Color standard for tube deposit rating (5
10、 aluminum strips)3. Terminology3.1 Abbreviations:PTFE = polytetrafluoroethylenePV = pressure vesselPVP = pressure vessel procedureSSCD = silver strip centering deviceTSMD = temperature sensing and monitoring deviceVTTP = vented test tube procedure4. Summary of Test Method4.1 A polished, thin silver
11、strip is immersed in 30 mL of thesample being tested, and heated at 50C (122F) for 2 h. At theend of the heating period, the silver strip is removed, washed,and the color and tarnish level assessed against the Silver StripClassifications in Table 1.1This test method is under the jurisdiction of ASTM
12、 Committee D02 onPetroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.05.0C on Color and Reactivity.Current edition approved Oct. 1, 2010. Published December 2010. DOI:10.1520/D766710E02.2For referenced ASTM standards, visit the ASTM website, www.astm.
13、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 from Energy Institute, 61 New Cavendish St., London, WIG 7AR,U.K., http:/www.energyinst.org.uk.4Available from ASTM
14、 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 States15. Significance and Use5.1 Crude petroleum contains sulfur compounds, most ofwhich are removed d
15、uring refining. However, of the sulfurcompounds remaining in the petroleum product or introducedinto the fuel during storage and distribution, some can have acorroding action on various metals and this corrosivity is notnecessarily related directly to the total sulfur content. Theeffect can vary acc
16、ording to the chemical types of sulfurcompounds present. The silver strip corrosion test is designedto assess the relative degree of corrosivity of a petroleumproduct towards silver and silver alloys.5.2 Under some circumstances, reactive sulfur compoundspresent in automotive spark-ignition engine f
17、uels can tarnish oreven corrode silver alloy fuel gauge in-tank sender units orsilver-plated bearings (in 2-stroke cycle engines). To minimizeor prevent the failure of silver alloy in-tank sender units bytarnish or corrosion, Specification D4814 requires that fuelsshall pass a silver strip corrosion
18、 test.6. Apparatus6.1 Silver Strip Corrosion Pressure Vessel (Procedure A),constructed from stainless steel according to dimensions givenin Fig. 1, as described in Test Method D130. The vessel shallbe capable of withstanding a test pressure of 700 kPa (100 psi).Alternative designs for the vessels ca
19、p and synthetic rubbergasket may be used provided that the internal dimensions of thevessel are the same as shown in Fig. 1, which allow a nominal25 by 150 mm (1 by 6 in.) test tube (see 6.2) and the SSCD (see6.4) to be placed inside the pressure vessel.6.2 Test Tubes, of borosilicate glass of nomin
20、al 25 by150 mm (1 by 6 in.) dimensions, preferably graduated at 30 mLvolume.5,6The internal dimensions shall be checked as accept-able by use of a silver strip (see 7.4). When 30 mL of sampleis added to the test tube with the silver strip in it, a minimumof 5 mm of liquid shall be above the top surf
21、ace of the strip.6.3 Test Bath, General, whether liquid or solid, the test bathshall be able to maintain the test temperature to within 61C(2F) of the required test temperature. It is recommended thatbaths be placed inside a fume-hood.6.3.1 Bath, shall be fitted with suitable supports to hold eachte
22、st tube (see 6.2) in a vertical position to a depth of about100 mm (4 in.) as measured from the bottom of the test tube tothe bath surface.6.3.2 Bath Medium, as a liquid bath medium, both water andoil have been found to be satisfactory and controllable at thespecified test temperature and duration r
23、equired by the testprocedure.6.3.3 Solid Block Bath, made of aluminum, shall meet thetest temperature control, test duration, and immersion condi-tions required by the test procedure, and shall be verified, atleast annually, for temperature measurement (heat transfer) byrunning tests on tubes filled
24、 with 30 mL of product plus a thinsilver strip of the given nominal dimensions, plus a tempera-ture sensor.6.3.3.1 Wells provided in the solid block bath to accommo-date pressure vessels (see Fig. 1) shall be of the followingdimensions: 54 mm (218 in.) diameter from top, up to a depthof 70 mm (234 i
25、n.) continuing with an opening of 38 mm(112 in.) diameter up to a depth of 140 mm (512 in.). Anopening of 8 mm (516 in.) diameter by 210 mm (814 in.)depth shall be provided in the center of the block for immersionof a metal temperature sensor (connected to a suitable 50 61C (122 6 2F) temperature co
26、ntroller), or thermometer (see6.5).6.3.3.2 Wells provided in the solid block bath to accommo-date test tubes shall be of the following dimensions: 20 mm(1116 in.) diameter by 140 mm (512 in.) deep. An opening of8 mm (516 in.) diameter by 210 mm (814 in.) depth shall beprovided in the center of the b
27、lock for immersion of a metaltemperature sensor (connected to a suitable 50 6 1C (122 62F) temperature controller), or thermometer (see 6.5).6.3.3.3 Provide insulation made of 25.4 mm (1.0 in.) thickfiberglass with aluminum backing (or, similar insulation) tocover all the four sides of the solid blo
28、ck bath.6.4 Silver Strip Centering Device (SSCD),7,6made of mate-rial which is gasoline-compatible at 50C (122F) for theduration of the test, such as Acetal Resin, White Nylon 6/6, orPTFE. See details in A1.1(Assembly View) and A1.2 (Indi-vidual Parts View). Length of SSCD inside the test tube is su
29、chthat the lower edge of the assembled silver strip is about 22 mm(78 in.) from the bottom of the test tube.5The sole source of supply of the apparatus known to the committee at this timeis Quark Enterprises, Inc., 320 Morton Ave., Rosenhayn, NJ 08352.6If you are aware of alternative suppliers, plea
30、se provide this information toASTM International Headquarters. Your comments will receive careful consider-ation at a meeting of the responsible technical committee,1which you may attend.7The sole source of supply of the apparatus known to the committee at this timeisK the test Procedure, A or B; te
31、st duration, minutes; andtest temperature, degrees Celsius, in the following format:Corrosion, silver strip, by D7667, Procedure A or B, X at Y:Z (1)where:X = test duration, in minutes,Y = test temperature, C, andZ = classification category (that is 0, 1, 2, 3 or 4).14. Precision and Bias14.1 Precis
32、ionThe precision of this test method has notbeen determined.NOTE 5In the case of results which consist of a rating on a non-linearscale, no generally accepted method for determining precision or bias iscurrently available.14.2 BiasThe procedure in this test method has no biasbecause the results of s
33、ilver corrosion are defined only in termsof this test method.15. Keywords15.1 automotive gasoline; corrosiveness to silver; silvercorrosion; silver stripANNEX(Mandatory Information)A1. SILVER STRIP CENTERING DEVICE (SSCD)A1.1 Assembly ViewA1.1.1 See Fig. A1.1.A1.2 Individual Parts ViewA1.2.1 See Fig
34、. A1.2.D7667 1025NOTE 1MATERIAL: ALL PARTS - GASOLINE COMPATIBLE AT 50C (122F) for 2-3 H/TEST SUCH AS ACETAL RESIN, WHITE NYLON6/6 OR PTFE.FIG. A1.1 Assembly ViewD7667 1026ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned
35、in 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.This standard is subject to revision at any time by the responsible technical committee and m
36、ust 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 International Headquarters. Your comments will receive careful consideration at a meeting of t
37、heresponsible 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 shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C7
38、00, 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). Permissi
39、on rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).NOTE 1MATERIAL: ALL PARTS - GASOLINE COMPATIBLE AT 50C (122F) for 2-3 H/TEST SUCH AS ACETAL RESIN, WHITE NYLON6/6 OR PTFE.All dimensions are in millimetres.FIG. A1.2 Individual Parts ViewD7667 1027
