Designation:D4340−19StandardTestMethodforCorrosionofCastAluminumAlloysinEngineCoolantsUnderHeat-RejectingConditions1ThisstandardisissuedunderthefixeddesignationD4340;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversalaboratoryscreeningproce-dureforevaluatingtheeffectivenessofenginecoolantsincombatingcorrosionofaluminumcastingalloysunderheat-transferconditionsthatmaybepresentinaluminumcylinderheadengines.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninSections11and12.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1176PracticeforSamplingandPreparingAqueousSolu-tionsofEngineCoolantsorAntirustsforTestingPurposes3.SummaryofTestMethod3.1Inthistestmethod,aheatfluxisestablishedthroughacastaluminumalloytypicalofthatusedforenginecylinderheadswhileexposedtoanenginecoolantunderapressureof193kPa(28psi).Thetemperatureofthealuminumspecimenismaintainedat135°C(275°F)andthetestiscontinuedfor1week(168h).Theeffectivenessofthecoolantforpreventingcorrosionofthealuminumunderheat-transferconditions(hereafterreferredtoasheat-transfercorrosion)isevaluatedonthebasisoftheweightchangeofthete...
