ASTM_D_7935_-_D_7935M_-_14.pdf

Designation:D7935/D7935M14Standard Test Method forCorrosion Test for Non-Aqueous Engine Coolants inGlassware1This standard is issued under the fixed designation D7935/D7935M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a simple beaker-type procedurefor evaluating the effects of non-aqueous engine coolants onmetal specimens under controlled laboratory conditions(seeAppendix X1).NOTE1For more information on aqueous and non-aqueous enginecoolants,see(Refs 1-9).21.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.Some values have only SI units because theinch-pound equivalents are not used in practice.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.Some specifichazards statements are given in 10.1.7.2,10.1.7.3,and 10.1.7.4.2.Referenced Documents2.1 ASTM Standards:3B32 Specification for Solder MetalB36/B36M Specification for Brass Plate,Sheet,Strip,AndRolled BarD1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAntirusts for Testing PurposesD1384 Test Method for Corrosion Test for Engine Coolantsin GlasswareE1 Specification for ASTM Liquid-in-Glass ThermometersE178 Practice for Dealing With Outlying ObservationsE230/E230M Specification and Temperature-ElectromotiveForce(emf)Tables for Standardized Thermocouples2.2 ASTM Adjunct:4All-glass apparatus for corrosion test(2 drawings)3.Summary of Test Method3.1 In this test method,specimens of metals typical of thosepresent in engine cooling systems are totally immersed inaerated engine coolant solutions for 336 h at 96C 205F.Thecorrosion-inhibitive properties of the test solution are evaluatedon the basis of the weight changes incurred by the specimens.Each test is run in triplicate,and the average weight change isdetermined for each metal.A single test may occasionally becompletely out of line(see 11.3).4.Significance and Use4.1 This test method will generally distinguish betweennon-aqueous coolants that are definitely deleterious from thecorrosion standpoint and those that are suitable for furtherevaluation.However,the results of this test method cannotstand alone as evidence of satisfactory corrosion inhibition.The actual service value of an engine coolant formulation canbedeterminedonlybymorecomprehensivebench,dynamometer,and field tests.5.Apparatus5.1 Container,a 1000-mL,tall-form,spoutless beaker,madeof heat-resistant glass,for containing the non-aqueous enginecoolant solution and test specimens.The beaker shall be tightlyclosed with a No.15 rubber stopper,having drill holes toaccommodate a water condenser,an aerator tube,and atemperature measuring instrument as shown in Fig.1.Optionally,an all-glass apparatus may be used.45.2 Condenser,a water condenser of the reflux,glass-tubetype,having a 400-mm 16-in.condenser jacket.1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.22 on Non-Aqueous Coolants.Current edition approved June 1,2014.Published August 2014.DOI:10.1520/D7935_D7935M142The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For 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.4Available from ASTM International Headquarters.Order Adjunct No.ADJD1384.Original adjunct produced in 1980.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 Aerator Tube,a gas-dispersion tube,porosity size 12-C,5to ensure continuous aeration without plugging.5.4 Temperature Measuring Instrument(EnvironmentallySafe Thermometer or Thermocouple),anASTM Partial Immer-sion Temperature Measuring Instrument having a range from 20 to 150C 0 to 302F and conforming to the requirementsfor Thermometer 1C 1F,as prescribed in Specification E1or Thermocouple as summarized in Specification E230/E230M.5.5 Heater,a constant-temperature bath containing a high-boiling liquid that is capable of giving continuous service withthe specified temperature control.6The size of the bath will bedetermined by the number of corrosion test