ASTM_D_7820_-_12.pdf

Designation:D782012Standard Test Method forEngine Coolant Corrosion Protection Under AcceleratedThermal and Oxidizing Conditions Using a RotatingPressure Vessel1This standard is issued under the fixed designation D7820;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 determination of engine coolantcorrosion protection and stability under accelerated thermaland oxidizing conditions using a rotary pressure vessel.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.Specific hazardstatements are given in 6.2,6.3,6.4,6.5,6.7,6.8,6.9,6.10,11.1,12.8,12.9,and 12.10.2.Referenced Documents2.1 ASTM Standards:2B32 Specification for Solder MetalD1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAntirusts for Testing PurposesD1193 Specification for Reagent WaterD1384 Test Method for Corrosion Test for Engine Coolantsin GlasswareD2272 Test Method for Oxidation Stability of Steam Tur-bine Oils by Rotating Pressure VesselE1 Specification for ASTM Liquid-in-Glass ThermometersE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized Thermocouples3.Summary of Test Method3.1 The engine coolant test fluid and a metal coupon bundleare placed in a covered glassware container in a pressure vesselequipped with a pressure gauge.The pressure vessel is chargedwith air or oxygen to a gage pressure of 620 kPa(90 psi,6.2bar)(see conversion factor 1),placed in a constanttempera-ture oil bath set at a controlled temperature(typically 115C(239F)or 150C(302F)and rotated axially at 100 rpm at anangle of 30 from horizontal for 168 h.The use of air oroxygen and test temperature is left to the discretion of the userof the test.Engine coolant performance is assessed for corro-sion protection based on changes in metal coupon weights andcoolant stability is evaluated based on changes in coolantphysical and compositional properties.The test method isbased on a combination of ASTM D1384(modified metalcoupon bundle)andASTM D2272(glassware,pressure vessel,and bath apparatus)test procedures.100 kPa 5 1.00 bar 5 14.5 psi(1)4.Significance and Use4.1 Engines operating under severe conditions involvinghigh temperatures,hot spot areas,entrained air,and/or smallcooling systems are placing greater emphasis on engine coolantoxidation stability and corrosion protection.This standardprovides an accelerated test method to assess engine coolantperformance under high temperature oxidizing test conditionsof new,used,and/or recycled engine coolants.The test methodmay also serve as a screening tool to determine oxidationstability.The test results of this method cannot stand alone asevidence of satisfactory oxidation stability and corrosionprotection.The actual service of an engine coolant formulationcan be determined only by more comprehensive bench,dynamometer,and field tests.5.Apparatus5.1 Oxidation Vessel,Glass Sample Container with Four-Hole Polytetrafluoroethylene(PTFE)Disk,Hold-DownSpring,Pressure Gage,and Test Bath,as described in AnnexA1.The assembled apparatus is shown schematically in Fig.1and Fig.A1.5.5.2 Temperature-Measuring Instrument(EnvironmentallySafe Thermometer or Thermocouple)An ASTM partial im-mersion temperature-measuring instrument having a rangefrom 20 to 150C(0 to 302F)and conforming to the1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.21 on Extended Life Coolants.Current edition approved Nov.1,2012.Published December 2012.DOI:10.1520/D7820-12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 requirements for Thermometer 1C(1F),as prescribed inSpecification E1 or thermocouple as summarized in Specifica-tion E230.6.Reagents and Materials6.1 Purity of ReagentsReagent-grade chemicals shall beused in all tests.Unless otherwise specified,it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society wheresuch specifications are available.3Other grades may be usedprovided it is first ascertained that the reagent