ASTM-B117-16-盐雾测试方法

Designation:B117−16StandardPracticeforOperatingSaltSpray(Fog)Apparatus1ThisstandardisissuedunderthefixeddesignationB117;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thispracticecoverstheapparatus,procedure,andconditionsrequiredtocreateandmaintainthesaltspray(fog)testenvironment.SuitableapparatuswhichmaybeusedisdescribedinAppendixX1.1.2Thispracticedoesnotprescribethetypeoftestspeci-menorexposureperiodstobeusedforaspecificproduct,northeinterpretationtobegiventotheresults.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B368TestMethodforCopper-AcceleratedAceticAcid-SaltSpray(Fog)Testing(CASSTest)D609PracticeforPreparationofCold-RolledSteelPanelsforTestingPaint,Varnish,ConversionCoatings,andRelatedCoatingProductsD1193SpecificationforReagentWaterD1654TestMethodforEvaluationofPaintedorCoatedSpecimensSubjectedtoCorrosiveEnvironmentsE70TestMethodforpHofAqueousSolutionsWiththeGlassElectrodeE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodG85PracticeforModifiedSaltSpray(Fog)Testing3.SignificanceandUse3.1Thispracticeprovidesacontrolledcorrosiveenviron-mentwhichhasbeenutilizedtoproducerelativecorrosionresistanceinformationforspecimensofmetalsandcoatedmetalsexposedinagiventestchamber.3.2Predictionofperformanceinnaturalenvironmentshasseldombeencorrelatedwithsaltsprayresultswhenusedasstandalonedata.3.2.1Correlationandextrapolationofcorrosionperfor-mancebasedonexposuretothetestenvironmentprovidedbythispracticearenotalwayspredictable.3.2.2Correlationandextrapolationshouldbeconsideredonlyincaseswhereappropriatecorroboratinglong-termatmo-sphericexposureshavebeenconducted.3.3Thereproducibilityofresultsinthesaltsprayexposureishighlydependentonthetypeofspecimenstestedandtheevaluationcriteriaselected,aswellasthecontroloftheoperatingvariables.Inanytestingprogram,sufficientrepli-catesshouldbeincludedtoestablishthevariabilityoftheresults.Variabilityhasbeenobservedwhensimilarspecimensaretestedindifferentfogchamberseventhoughthetestingconditionsarenominallysimilarandwithintherangesspeci-fiedinthispractice.4.Apparatus4.1Theapparatusrequiredforsaltspray(fog)exposureconsistsofafogchamber,asaltsolutionreservoir,asupplyofsuitablyconditionedcompressedair,oneormoreatomizingnozzles,specimensupports,provisionforheatingthechamber,andnecessarymeansofcontrol.Thesizeanddetailedcon-structionoftheapparatusareoptional,providedtheconditionsobtainedmeettherequirementsofthispractice.4.2Dropsofsolutionwhichaccumulateontheceilingorcoverofthechambershallnotbepermittedtofallonthespecimensbeingexposed.4.3Dropsofsolutionwhichfallfromthespecimensshallnotbereturnedtothesolutionreservoirforrespraying.4.4Materialofconstructionshallbesuchthatitwillnotaffectthecorrosivenessofthefog.1ThispracticeisunderthejurisdictionofASTMCommitteeG01onCorrosionofMetalsandisthedirectresponsibilityofSubcommitteeG01.05onLaboratoryCorrosionTests.CurrenteditionapprovedMarch15,2016.PublishedApril2016.Originallyapprovedin1939.Lastpreviouseditionapprovedin2011asB117–11.DOI:10.1520/B0117-16.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates1CopyrightASTMInternationalProvidedbyIHSunderlicensewithASTMNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,`,,,`,,,`,`````,``,`,,`,``-`-`,,`,,`,`,,`---4.5AllwaterusedforthispracticeshallconformtoTypeIVwaterinSpecificationD1193(exceptthatforthispracticelimitsforchloridesandsodiummaybeignored).Thisdoesnotapplytorunningtapwater.Allotherwaterwillbereferredtoasreagentgrade.NOTE1—Waterusedwithaconductivity≤1.0µS/cm(orresistivity≥1.0MΩ·cm)maycausedamagetosomeequipmentduetothereactivenatureofthewater.Inaddition,itmaycauseissueswithstabilizingpHmeasurements.5.TestSpecimens5.1Thetypeandnumberoftestspecimenstobeused,aswellasthecriteriafortheevaluationofthetestresults,shallbedefinedinthespecificationscoveringthematerialorproductbeingexposedorshallbemutuallyagreeduponbetweenthepurchaserandtheseller.6.PreparationofTestSpecimens6.1Specimensshallbesuitablycleaned.Thecleaningmethodshallbeoptionaldependingonthenatureofthesurfaceandthecontaminants.Careshallbetakenthatspecimensarenotrecontaminatedaftercleaningbyexcessiveorcarelesshandling.6.2Specimensfortheevaluati