【astm標準】d 7869 - 13

1、Designation:D7869?13StardPracticefXenonArcExposureTestwithEnhancedLightWaterExposurefTransptationCoatings1ThisstardisissuedunderthefixeddesignationD7869thenumberimmediatelyfollowingthedesignationindicatestheyearofiginala

2、doptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thispracticespecifiestheoperatingproced

3、uresfacontrolledirradiancexenonarclightwaterapparatus.Theprocedureusesonemelamp(s)opticalfilter(s)toproduceirradiancesimilartosunlightintheUVvisiblerange.Italsosimulatesthewaterabsptionstresscyclesexperiencedbyautomotive

4、extericoatingsundernaturalweatheringconditions.Thispracticehasalsobeenfoundapplicabletocoatingsonothertransptationvehiclessuchasaircrafttrucksrailcars.1.2Thispracticeusesaxenonarclightsourcewithspecifiedopticalfilter(s).

5、Thespectralpowerdistribution(SPD)fthelampspecialdaylightfilter(s)isasspecifiedinAnnexA1.Theirradiancelevelusedinthispracticevariesbetween0.400.80W(m2nm)at340nm.Waterissprayedonthespecimensduringptionsofseveraldarksteps.T

6、heapplicationofwaterissuchthatthecoatingswillabsbdesbsubstantialamountsofwaterduringtesting.Inadditionthecyclingbetweenwetdrywarmcoolwillinducemechanicalstressesintothematerials.Thesetestconditionsaredesignedtosimulateth

7、ephysicalchemicalstressesfromenvironmentsinasubtropicalclimatesuchassouthernFlida.1.3ThevaluesstatedinSIunitsaretoberegardedasstard.Nootherunitsofmeasurementareincludedinthisstard.1.4Thisstarddoesnotpurpttoaddressallofth

8、esafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D451

9、7TestMethodfLowLevelTotalSilicainHighPurityWaterbyFlamelessAtomicAbsptionSpectroscopyG113TerminologyRelatingtoNaturalArtificialWeatheringTestsofNonmetallicMaterialsG147PracticefConditioningHlingofNonmetallicMaterialsfNat

10、uralArtificialWeatheringTestsG151PracticefExposingNonmetallicMaterialsinAcceleratedTestDevicesthatUseLabatyLightSourcesG155PracticefOperatingXenonArcLightApparatusfExposureofNonMetallicMaterials3.Terminology3.1Definition

11、sapplicabletothisstardcanbefoundinTerminologyG113.3.2transptationcoatingsn—extericoatingsusedfvehiclessubjectedtonaturalweatheringconditionssuchasautomobilesaircrafttrucksrailcarsetc.4.SummaryofPractice4.1Testspecimensar

12、eexposedtospecifictestconditionsdesignedtosimulatethephysicalchemicalstressesfromenvironmentsinasubtropicalclimatesuchassouthernFlida.Thetestconditionsconsistofaprimarytestcycleasubcycle.Theprimarytestcycleincludestwolon

13、gwaterexposuresasinglelonglightexposurewithprecisespectralmatchtodaylightasdescribedinAnnexA1.Itisdesignedtoreproducewaterperationfailuressuchasadhesionblisteringdiffusionofsmallmolecules(1).3Thesubcycleconsistingofshter

14、alternatingwaterlight1ThispracticeisunderthejurisdictionofASTMCommitteeD01onPaintRelatedCoatingsMaterialsApplicationsisthedirectresponsibilityofSubcommitteeD01.27onAcceleratedTesting.CurrenteditionapprovedJune12013.Publi

15、shedJune2013.DOI:10.1520D786913.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Theboldfacenumbe

16、rsinparenthesesrefertothelistofreferencesattheendofthisstard.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1NOTE7—Specimenrepositioningin9.4.19.4.2isrequiredtocompensatefvari

17、ationsinlightwaterrelativehuitytemperaturewithinthetestchamber.9.5Thetestshallbeinterruptedfrepositioningspecimenevaluationsonlyduringastepwithoutwaterspray.10.Rept10.1ThetestreptshallconfmtoPracticeG151.Thereptshallalso

18、includetheaverageofthreewatercollectionmeasurementsfeachpositioninthexenonarclightwaterapparatusinaccdancewithAnnexA3.11.Keywds11.1acceleratedautomotivecoatingsdurabilityexposuretestirradiancelightfastnessweatheringxenon

19、arcANNEXESA1.DAYLIGHTFILTERIRRADIANCELIMITSBYWAVELENGTH(MatyInfmationfEquipmentManufacturers)A1.1ConfmancetothespectralpowerdistributioninTableA1.1isadesignparameterfaxenonarcsourcewiththedifferentopticalfiltersprovided.

20、Manufacturersofequipmentclaimingconfmancetothisstardshallberesponsiblefdeterminingconfmancetothespectralpowerdistributiontablefalllampfiltercombinationsprovidedprovideinfmationonmaintenanceprocedurestominimizeanyspectral

21、changesthatmayoccurduringnmaluse.TABLE1ExposureCycleStepNumberStepMinutesFunctionIrradianceSetPointAat340nmW(m2nm)BlackPanelTemperatureSetPointAChamberAirTemperatureSetPointARelativeHuitySetPointA1240darkspray——40C95%230

22、light0.4050C42C50%3270light0.8070C50C50%430light0.4050C42C50%5150darkspray——40C95%630darkspray——40C95%720light0.4050C42C50%8120light0.8070C50C50%910dark——40C50%10Repeatsubcyclesteps6to9(showninbold)anadditional3times(fat

23、otal24h=1cycle).AThesetpointisthetargetconditionfthesensusedattheoperationalcontrolpointisprogrammedbytheuser.Whentheexposurecyclecallsfaparticularsetpointtheuserprogramstheapparatustousethatexactnumber.Operationalfluctu

24、ationsaredeviationsfromtheindicatedsetpointduringequilibriumoperation.Themaximumallowableoperationalfluctuationduringequilibriumconditionsftheexposurecycleaboveis0.02W(m2nm)firradiance2.5Cfblackpaneltemperature2Cfchamber

25、airtemperature10%frelativehuity.WavelengthBTotalIrradianceOverIndicatedWavelengthB(Wm2)(nm)MinimumMaximumλ2900.000.005290#λ2950.000.01295#λ3000.010.04300#λ3050.100.20305#λ3100.380.56310#λ3202.293.10320#λ3304.765.82330#λ3