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1、Designation:B735?06(Reapproved2011)StardTestMethodfPosityinGoldCoatingsonMetalSubstratesbyNitricAcidVap1ThisstardisissuedunderthefixeddesignationB735thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladop

2、tioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodcoversequipmentproceduresfus

3、ingnitricacidvapfdeterminingposityingoldcoatingsgreaterthan0.6m(25in.)inthicknessparticularlyelectrodepositscladmetalsusedonelectricalcontacts.1.2Thistestmethodisdesignedtoshowwhetherthepositylevelislessgreaterthansomeva

4、luethatbyexperienceisconsideredbytheusertobeacceptableftheintendedapplication.1.3AvarietyofotherpositytestingmethodsaredescribedinGuideB765intheliterature.23OtherpositytestmethodsareTestMethodsB741B798B799B809.1.4Thevalu

5、esstatedinSIunitsaretoberegardedasstard.Thevaluesgiveninparenthesesarefinfmationonly.1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtobecomefamil

6、iarwithallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheet(MSDS)fthisproductmaterialasprovidedbythemanufacturertoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitatio

7、nspritouse.SpecificprecautionsaregiveninSection89.4.2.ReferencedDocuments2.1ASTMStards:4B374TerminologyRelatingtoElectroplatingB542TerminologyRelatingtoElectricalContactsTheirUseB741TestMethodfPosityInGoldCoatingsOnMetal

8、SubstratesByPaperElectrography(Withdrawn2005)5B765GuidefionofPosityGrossDefectTestsfElectrodepositsRelatedMetallicCoatingsB798TestMethodfPosityinGoldPalladiumCoatingsonMetalSubstratesbyGelBulkElectrographyB799TestMethodf

9、PosityinGoldPalladiumCoatingsbySulfurousAcidSulfurDioxideVapB809TestMethodfPosityinMetallicCoatingsbyHuSulfurVap(“FlowersofSulfur”)3.Terminology3.1Definitions—ManytermsusedinthistestmethodaredefinedinTerminologyB542terms

10、relatingtometalliccoatingsaredefinedinTerminologyB374.3.2DefinitionsofTermsSpecifictoThisStard:3.2.1crosionproductsn—thosereactionproductsemanatingfromthepesthatprotrudefromareotherwiseattachedtothecoatingsurfaceafterava

11、ptestexposure.3.2.2measurementarea(“significantsurface”)n—thesurfacethatisexaminedfthepresenceofposity.Thesignificantsurfacesmeasurementareasoftheparttobetestedshallbeindicatedonthedrawingofthepartbyprovisionofsuitablyma

12、rkedsamples.3.2.2.1Discussion—Fspecificationpurposesthesignificantsurfacesmeasurementareasareoftendefinedasthoseptionsofthesurfacethatareessentialtotheserviceabilityfunctionofthepartsuchasitscontactpropertieswhichcanbeth

13、esourceofcrosionproductstarnishfilmsthatinterferewiththefunctionofthepart.3.2.3metalliccoatingsn—includeplatingscladdingsothermetalliclayersappliedtothesubstrate.Thecoatingcancompriseasinglemetalliclayeracombinationofmet

14、alliclayers.3.2.4posityn—thepresenceofanydiscontinuitycrackholeinthecoatingthatexposesadifferentunderlyingmetal.1ThistestmethodisunderthejurisdictionofASTMCommitteeB02onNonferrousMetalsAlloysisthedirectresponsibilityofSu

15、bcommitteeB02.11onElectricalContactTestMethods.CurrenteditionapprovedOct.12011.PublishedOctober2011.iginallyapprovedin1984.Lastpreviouseditionapprovedin2006asB735–06.DOI:10.1520B073506R11.2Fexamplesee:NobelF.J.OstrowB.D.

16、ThompsonD.W.“PosityTestingofGoldDeposits”PlatingVol521965p.1001.3KrumbeinS.J.PosityTestingofContactPlatingsProceedingsConnectsInterconnectionTechnologySymposiumOct.1987p.47.4FreferencedASTMstardsvisittheASTMwebsitewww.as

17、tm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.5Thelastapprovedversionofthishisticalstardisreferencedonwww.astm.g.Copyright?ASTMInternational10

18、0BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates18.SafetyHazards8.1Carryoutthistestmethodinachemicalfumehoodsincethegasesthatarereleasedmainlywhenthereactionvesselisopenedattheendofeachtestareverycrosive.8

19、.2Usecautionhowevertoensurethatdraftsthatareoftenfoundinfumehoodsdonotcausesignificantcoolingofthechamberwallsthatcouldleadtoariseintherelativehuityaccelerationofthetest(see9.3).Itisoftenconvenienttoenclosethereactionves

20、selinaboxwithaloosefittingcover.8.3Observenmalprecautionsinhlingcrosiveacids.Inparticularweargogglescompletelyenclosingtheeyeswhenhlingnitricacidmakeeyewashfacilitiesreadilyavailable.9.Procedure9.1Hlespecimensaslittleasp

21、ossibleonlywithtweezersmicroscopelenstissuecleansoftcottongloves.Pritothetestinspectthesamplesunder10magnificationfevidenceofparticulatematter.Ifpresentsuchparticlesshallberemovedbyblowingthemoffwithcleanoilfreeair.Ifthi

22、sisnotsuccessfuldiscardthesample.ThencleanthesampleswithsolventssolutionsthatdonotcontainchlinatedhydrocarbonsCFC’sotherknownozonedestroyingcompounds.TheprocedureoutlinedinNote1hasbeenfoundtogivesatisfactyresultsfplating

23、swithmildtomoderatesurfacecontamination.NOTE1—Suggestedcleaningprocedure:(1)Keepindividualcontactsseparatedifthereisapossibilityofdamagetothemeasurementareasduringthevariouscleaningsteps.(2)Cleansamplesf5mininanultrasoni

24、ccleanerwhichcontainsahot(65–85C)2%aqueoussolutionofamildlyalkaline(pH7.5–10)detergent(suchasMicroSparkleen).(3)Afterultrasoniccleaningrinsesamplesunderwarmrunningtapwaterfatleast5s.(4)Rinsesamplesultrasonicallyf2mininfr

25、eshdeionizedwatertoremovethelastdetergentresidues.(5)Immerseinfreshmethanolisopropanolultrasonically“agitate”fatleast30sindertoremovethewaterfromthesamples.(6)Removedrysamplesuntilthealcoholhascompletelyevaporated.Ifanai

26、rblastisusedasanaidtodryingtheairshallbeoilfreecleandry.(7)Donottouchmeasurementareaofthesampleswithbarefingersaftercleaning.(8)Reinspectsamples(under10magnification)fparticulatematteronthesurface.Ifparticulatesarefoundr

27、epeatthecleaningsteps.Surfacecleanlinessisextremelyimptantcontaminantssuchasplatingsaltsganicfilmsmetalflakesmaygiveerroneousindicationsofdefectsareunacceptable.NOTE2—Iflargeareasofexposednonnoblemetalarepresentmaskingth

28、eseareasmaybenecessary.Howeverwhenmaskingisdonewithplater’stapetakecarenottoinhibittheflowofacidvaptothemeasurementarea.9.2Theambienttemperaturethetemperatureofthespecimenssolutionare2363Catthebeginningofthetestmaintaine

29、dthroughoutthetestperiod.9.3Therelativehuityintheimmediatevicinityofthetestchambershallbenogreaterthan60%6although55%belowispreferred.Iftherelativehuityisgreaterthan60%donotrunthistest.9.4AddfreshHNO3tothebottomoftheclea

30、ndrytestchamberimmediatelyclosethecover.After3065minloadthesamplesusingsuitablefixturesreplacethecover.Theambientrelativehuityshallbenogreaterthan60%duringboththeadditionoftheHNO3theionofthesamples.6(Warning—Donotgreaset

31、herimofthedesiccatnitscover.Ifdesiredpressaminimumofthreestripsofpressuresensitivepolytetrafluoethylenetape(adhesivesidedown)atequalintervalsaroundthedesiccatrim.)9.5Unlessotherwisespecifiedtheexposuretimetonitricacidvap

32、shallbe6065min.Anexposuretimeof7565minisalsocommonlyusedfgoldthicknessesinthe2to2.5m(75to100in.)range.Atableofconvenientexposuretimesisgivenintheappendix.NOTE3—Variationsinexposuretimewiththicknessareoftenrecommendedbeca

33、usepesinthickercoatingsaredeepertheiraveragesizesaresmallerthanthoseinthinnercoatings.Thenitricacidmediumwouldtherefetakelongertoperateanaveragepeinthickercoatingscomparedtothinnerones.Ontheotherhwhenexposuretimesaretool

34、ongthecrosionproductswilloverlapimpairpedelineation.AdetaileddiscussionoftheseeffectsisgiveninFootnote3.9.6Removethesamplesattheendofthetestdryinanovenat12565Cf3065min.Thenremovefromtheovenplacedirectlyintoadesiccatconta

35、iningactivedesiccantallowtocooltoroomtemperature.NOTE4—DiscardtheHNO3inasafelegallyacceptablemanner.9.7Leavesamplesindessicatuntilactuallyreadytostarttheexamination.Thenopendesiccatslowlysincecoolingspecimensmaycreateapa

36、rtialvacuum.9.8Theexaminationshalltakeplacewithin1.5hofremovalfromtheoven.9.9Countindividualpesat10magnificationusingcollimatedincescentilluminationatanobliqueanglebelow15.Thepesiteswillbedelineatedbythecrosionproductspr

37、otrudingfromthesesites.Thesesolidsmaybetransparentinthecaseofgoldplatednickelnickelunderplateexercisegreatcareincountingparticularlywithroughcurvedsurfaces.9.10Measurecountacrosionproductwhenatleast3?4ofthecrosionproduct

38、fallswithinthemeasurementarea.Donotcountcrosionproductsthatinitiateoutsidethemeasurementareabutfallwithinitthatareirregularinshape(seeFig.1).9.11Occasionallyblistersmayfmwithgoldplatedonnickelanickelunderplate.Thismayocc

39、uratpesitesmaybeduetoentrapmentofcrosionproductsbeneaththeplating.Counttheblistersaspes.9.12Itisalsogoodpracticetomakeduplicatereadingsofeachareathenaveragethetworeadings.9.13Definepesizebythelongestdiameterofthecrosionp

40、roduct.Crosionproductssmallerthan0.05mm(0.002in.)aregenerallynotresolvableat10.Donotcountthemaspeseveniftheyareobserved(athighermagnification).6Fexamplesee:HoldenC.A.LuikR.“CriticalNitricAcidVapTestParametersAffectingthe

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