1、Designation:D757712Standard Test Method forDetermining the Accelerated Iron Corrosion Rating ofDenatured Fuel Ethanol and Ethanol Fuel Blends1This standard is issued under the fixed designation D7577;the number immediately following the designation indicates the year oforiginal adoption or,in the ca
2、se 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 measures the ability of inhibited anduninhibited Ethanol Fuel Blends defined by
3、 SpecificationD5798 and Denatured Fuel Ethanol defined by SpecificationD4806 to resist corrosion of iron should water become mixedwith the fuel,using an accelerated laboratory test method.Corrosion ratings are reported based on a visual,numberedrating scale.1.2 The values stated in SI units are to b
4、e regarded asstandard.The values in parentheses are for information 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
5、 applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in Sections 7 and 8.2.Referenced Documents2.1 ASTM Standards:2A29/A29M Specification for General Requirements for SteelBars,Carbon and Alloy,Hot-WroughtA108 Specification for Steel Bar,Carbon and Alloy,Cold-Fi
6、nishedD665 Test Method for Rust-Preventing Characteristics ofInhibited Mineral Oil in the Presence of WaterD1193 Specification for Reagent WaterD2699 Test Method for Research Octane Number of Spark-Ignition Engine FuelD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4806 Spec
7、ification for Denatured Fuel Ethanol for Blend-ing with Gasolines for Use as Automotive Spark-IgnitionEngine FuelD5798 Specification for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark-Ignition EnginesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE2251 Specification
8、 for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D4175.3.1.2 Fuel C,na volumetric mixture of 50 volume percentreference fuel grade toluene and 50 volume percent referencef
9、uel grade isooctane.3.1.2.1 DiscussionSpecifications for reference fuel gradetoluene and reference fuel grade isooctane can be found in TestMethod D2699.3.2 Abbreviations:3.2.1 HDPE,nhigh density polyethylene3.2.2 PTFE,nPolytetrafluoroethylene4.Summary of Test Method4.1 A polished steel test rod is
10、immersed in a mixture of thetest sample and water at a ratio of 10 parts fuel sample to 1 partwater and held at a temperature of 37 to 39C(98 to 102F)for1 h.4.2 At the end of 1 h,the test rod is removed,rinsed andrated according to a numeric corrosion rating scale.5.Significance and Use5.1 This test
11、 is designed to be used as a rapid measure of theoverall relative corrosivity of Ethanol Fuel Blends(Specifica-tion D5798)and Denatured Fuel Ethanol(SpecificationD4806)to iron(steel).5.2 The test can be used to compare corrosion inhibitordosage levels and effectiveness of various corrosion inhibitor
12、sas they pertain to protecting iron(steel)materials fromcorrosion.6.Apparatus6.1 GeneralTwo test apparatus have been evaluated andfound to give comparable results.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct resp
13、onsibility ofSubcommittee D02.14 on Stability and Cleanliness of Liquid Fuels.Current edition approved Dec.15,2012.Published January 2013.DOI:10.1520/D7577-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTM
14、Standards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.1.1 Large sample volume(300 mL)apparatus specified inTest Method D665.6.1.2 Small sample volume
15、(30 75 mL)apparatus speci-fied in 6.2.6.2 Small Volume Test Apparatus(Fig.1).6.2.1 Compared to Test Method D665,the small volume testapparatus is lower in cost and allows for use of smallervolumes of samples to improve the safety of the measurement.Different apparatus and components that achieve the
16、 sameresults may be used.6.2.2 Hot plate/stir plate or water bath capable of maintain-ing a temperature of 37 to 39C(98 to 102F)and stirring at arate of 900 6 100 r/min.6.2.3 150-200 mL borosilicate glass beakers to hold waterto serve as a water bath.6.2.4 50-150 mL borosilicate,flat bottom,glass test jar tohold test sample.6.2.5 Jar covers made of HDPE or other material compatiblewith ethanol,water and gasoline with three holes:6.2.5.1 A hole to suspend the steel test rod into the testsample,6.
