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1、Designation:B700?08(Reapproved2014)StardSpecificationfElectrodepositedCoatingsofSilverfEngineeringUse1ThisstardisissuedunderthefixeddesignationB700thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladopti

2、oninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisspecificationcoversrequirementsfelectrod

3、epositedcoatingsofsilverusedfengineeringpurposesthatmaybematbrightsemibrightarenotlessthan98%silverpurity.1.2Coatingsofsilvercoveredbythisspecificationareusuallyemployedfsolderablesurfaceselectricalcontactacteristicshigh

4、electricalthermalconductivitythermocompressionbondingwearresistanceofloadbearingsurfacesspectralreflectivity.1.3IntheAppendixesimptantacteristicsofelectrodepositedsilvercoatingsarebrieflydescribedwhichmustbeconsideredwhe

5、nusedinengineeringapplicationsnamelyelectricalconductivity(seeAppendixX1)silvermigration(seeAppendixX2)thickness(seeAppendixX3)hardness(seeAppendixX4)atmospherictarnish(seeAppendixX5).1.4Thefollowinghazardscaveatpertains

6、onlytothetestmethodssectionofthisspecification:Thisstarddoesnotpurpttoaddressthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheappl

7、icabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2B183PracticefPreparationofLowCarbonSteelfElectroplatingB242GuidefPreparationofHighCarbonSteelfElectroplatingB252GuidefPreparationofZincAlloyDieCa

8、stingsfElectroplatingConversionCoatingsB253GuidefPreparationofAluminumAlloysfElectroplatingB254PracticefPreparationofElectroplatingonStainlessSteelB281PracticefPreparationofCopperCopperBaseAlloysfElectroplatingConversion

9、CoatingsB322GuidefCleaningMetalsPritoElectroplatingB343PracticefPreparationofNickelfElectroplatingwithNickelB374TerminologyRelatingtoElectroplatingB481PracticefPreparationofTitaniumTitaniumAlloysfElectroplatingB482Practi

10、cefPreparationofTungstenTungstenAlloysfElectroplatingB487TestMethodfMeasurementofMetalOxideCoatingThicknessbyMicroscopicalExaminationofCrossSectionB499TestMethodfMeasurementofCoatingThicknessesbytheMagicMethod:NonmagicCo

11、atingsonMagicBasisMetalsB504TestMethodfMeasurementofThicknessofMetallicCoatingsbytheCoulometricMethodB507PracticefDesignofArticlestoBeElectroplatedonRacksB542TerminologyRelatingtoElectricalContactsTheirUseB567TestMethodf

12、MeasurementofCoatingThicknessbytheBetaBackscatterMethodB568TestMethodfMeasurementofCoatingThicknessbyXRaySpectrometryB571PracticefQualitativeAdhesionTestingofMetallicCoatingsB578TestMethodfMicrohardnessofElectroplatedCoa

13、tingsB579SpecificationfElectrodepositedCoatingsofTinLeadAlloy(SolderPlate)B602TestMethodfAttributeSamplingofMetallicInganicCoatingsB678TestMethodfSolderabilityofMetallicCoatedProductsB697GuidefionofSamplingPlansfInspecti

14、onofElectrodepositedMetallicInganicCoatingsB762TestMethodofVariablesSamplingofMetallicInganicCoatingsB849SpecificationfPreTreatmentsofIronSteelfReducingRiskofHydrogenEmbrittlement1Thisspecificationisunderthejurisdictiono

15、fASTMCommitteeB08onMetallicInganicCoatingsisthedirectresponsibilityofSubcommitteeB08.04onPreciousMetalCoatings.CurrenteditionapprovedMay12014.PublishedMay2014.iginallyapprovedin1981.Lastpreviouseditionapprovedin2008asB70

16、0–08.DOI:10.1520B070008R14.2B08FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInter

17、national100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1havenodamagingeffectsonthebasismetalresultinginpitsintergranularattackstresscrosioncrackinghydrogenembrittlement.NOTE3—Fbasismetalpreparationsthef

18、ollowingappropriateASTMstardsarerecommended:PracticesB183B254B281B343B481B482GuidesB242B252B253B322.6.3.2PreplatingOperations—Electroplatingshallbeappliedafterallbasismetalheattreatmentsmechanicaloperationssuchasfmingmac

19、hiningjoiningofthearticlehavebeencompleted.NOTE4—Silverdepositsmaybeusedtofacilitatemechanicaloperationssuchasfmingdrawing.Intheseapplicationssilverisappliedbefesuchprocesssteps.6.3.2.1StressReliefTreatment—Partsthatarem

20、adeofsteelswithultimatetensilestrengthof1000MPaover(hardnessof31HRCgreater)thathavebeenmachinedgroundcoldfmedcoldstraightenedsubsequenttoheattreatmentmayrequirestressreliefheattreatmentwhenspecifiedbythepurchaserthetensi

21、lestrengthtobesuppliedbythepurchaser.SpecificationB849maybeconsultedfalistofpretreatmentsthatareusedwidely.6.3.3Strike—Thefinalsilvercoatingshallbeprecededbyasilvergoldstrikefoptimumadhesion.6.3.4Underplating—Anickelnick

22、elalloyintermediatelayeratleast1m(39in.)thickshallbeappliedbefethesilverelectroplatewhentheproductbeingplatedismadefromcoppercopperalloy.Nickelunderplatingsarealsoappliedfotherreasons.6.3.5PostPlatingProcedures:6.3.5.1Em

23、brittlementRelief—Partsthataremadeofsteelswithultimatetensilestrengthof100MPaover(hardnessof31HRCgreater)aswellassurfacehardenedpartsmayrequirepostcoatinghydrogenembrittlementreliefbakingwhenspecifiedbythepurchasertheten

24、silestrengthtobesuppliedbythepurchaser.SpecificationB850maybeconsultedfalistofposttreatmentsthatareusedwidely.6.4SurfaceAppearance—Thecoating’ssurfacefinishshallmeettherequirementsofthespecifiedgradedefinedin4.3.6.5Suppl

25、ementaryPostTreatment—Thecoatingshallmeettherequirementsofthespecifiedclassdefinedin4.4.6.6Thickness—Thesilvercoatingthicknessonsignificantsurfacesshallbeatleastthatspecified(seeAppendixX3)whenmeasuredasdescribedin8.2.6.

26、7Appearance—Silverelectroplatedcoatedarticlesshallbecoveredcompletelyonallsurfacesasspecifiedinthemanufacturingdocumentshallhaveaunifmappearancewithnovisibledefectstotheextentthatthenatureofthebasismetalgoodcommercialpra

27、cticepermit.Therequirementfunifmcolappearanceneednotapplyfsubsequentpassivationothertreatmentsofthesilver.6.7.1Defects—Defectsinthesurfaceofthebasismetalsuchasscratchespitsnonconductinginclusionsrolldiemarksmayadverselya

28、ffecttheappearanceperfmanceofappliedcoatings.Suchdefectsthatpersistsinthefinishdespitetheobservanceofgoodmetalfinishingpracticesshallnotbecausefrejection.NOTE5—Coatedfinishesgenerallyperfmbetterinservicewhenthesubstrateo

29、verwhichtheyareappliedissmoothfreefromtnmetalinclusionspesotherdefects.Itisrecommendedthatthespecificationscoveringtheunfinishedproductprovideslimitsfthosedefects.Ametalfinisheroftencanremovedefectsbymeansofspecialtreatm

30、entssuchasgrindingpolishingabrasiveblastingchemicaltreatmentselectropolishing.Howeverthesearenotnmalfthetreatmentstepsprecedingapplicationofthefinish.Whentheyaredesiredtheyarethesubjectofspecialagreementbetweenthepurchas

31、erthesupplier.6.8Adhesion—Thesilvercoatingsshallbefreeofblisterspeeledareasindicatingpoadhesionwhentestedinaccdancewith8.3.NOTE6—Someapplicationsmayrequirenoseparationbyanymechanicalmeanssuchasmachiningmillingthroughthei

32、nterface.6.9Solderability—Thesilverplatedsurfacesshallproducesoldercoatingswhichshallbebrightsmoothunifm.Atleast95%ofthesamplesurfaceshallshowgoodwettingwhentestedasdescribedin8.5.6.10SupplementaryRequirements:6.10.1Hard

33、ness—Ifahardnessrequirementisspecifiedthehardnessofthesilvercoatingsshallconfmtothatspecifiedasmeasuredasdescribedin8.7.6.10.2SpectralReflectance—Thespectralreflectanceofthesilvercoatingsifrequiredshallconfmtothatspecifi

34、edwhenmeasuredasdescribedin8.8.6.10.3ElectricalConductivity—Theelectricalconductivityofthesilvercoatingsifrequiredshallconfmtothatspecifiedwhenmeasuredasdescribedin8.9.7.Sampling7.1AromsampleofthesizerequiredbyTestMethod

35、B602MethodB762shallbeedfromtheinspectionlot(see7.2).Thearticlesinthelotshallbeclassifiedasconfmingnonconfmingtoeachrequirementaccdingtothecriteriaofthesamplingplansinthechosenmethod.NOTE7—TestMethodB602containsfoursampli

36、ngplansthreefusewithnondestructivetestmethodsthefourthisfusewithdestructivetestmethods.Thethreemethodsfnondestructivetestsdifferinthequalityleveltheyrequireoftheproduct.TestMethodB602requiresuseoftheplanwiththeintermedia

37、tequalitylevelunlessthepurchaserspecifiesotherwise.Itisrecommendedthatthepurchasercomparetheplanswithhisneedsstatewhichplanistobeused.IftheplansinTestMethodB602donotservetheneedsadditionalonesaregiveninGuideB697whichprov

38、idesalargenumberofplansalsogivesguidanceinthechoiceofaplan.WhenGuideB697isspecifiedthebuyersellerneedtoagreeontheplantobeused.NOTE8—MethodB762isavariablessamplingplan.Suchplanscanonlybeusedwhenatestyieldsameasuredquantit

39、ysuchasthicknesswhentherequirementsarestatedasanumericalunitalsosuchasthickness.MethodB762containsseveralplansfspecialneeds.BuyersellermayagreeontheplanplanstobeusedifnotMethodB762identifiestheplantobeused.NOTE9—Whenboth

40、destructivenondestructivetestsexistfthemeasurementofaacteristicthepurchaserneedstostatewhichistobeusedsothepropersamplingplanised.Whethernotatestisdestructivemaynotalwaysbeclear.Atestmaydestroythecoatingbutinanoncritical

41、area.Thepurchaserneedstostatewhetherthetestistobeconsidereddestructivenondestructive.Thedecisionisimptantbecausetheplansfdestructivetestsaresignificantlylessabletodiscriminatebetweenacceptableunacceptablelots.Thisisbecau

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