ISO 4521-2008

REFERENCENUMBERISO45212008EISO2008INTERNATIONALSTANDARDISO4521SECONDEDITION20080901METALLICANDOTHERINORGANICCOATINGSELECTRODEPOSITEDSILVERANDSILVERALLOYCOATINGSFORENGINEERINGPURPOSESSPECIFICATIONANDTESTMETHODSREVTEMENTSMTALLIQUESETAUTRESREVTEMENTSINORGANIQUESDPTSLECTROLYTIQUESDARGENTETDALLIAGESDARGENTPOURAPPLICATIONSINDUSTRIELLESSPCIFICATIONSETMTHODESDESSAISISMULTIUSERLICENCEABBTECHNOLOGYLTD6/12/2009ISO45212008EPDFDISCLAIMERTHISPDFFILEMAYCONTAINEMBEDDEDTYPEFACESINACCORDANCEWITHADOBESLICENSINGPOLICY,THISFILEMAYBEPRINTEDORVIEWEDBUTSHALNOTBEEDITEDUNLESSTHETYPEFACESWHICHAREEMBEDDEDARELICENSEDTOANDINSTALEDONTHECOMPUTERPERFORMINGTHEEDITINGINDOWNLOADINGTHISFILE,PARTIESACCEPTTHEREINTHERESPONSIBILITYOFNOTINFRINGINGADOBESLICENSINGPOLICYTHEISOCENTRALSECRETARIATACCEPTSNOLIABILITYINTHISAREAADOBEISATRADEMARKOFADOBESYSTEMSINCORPORATEDDETAILSOFTHESOFTWAREPRODUCTSUSEDTOCREATETHISPDFFILECANBEFOUNDINTHEGENERALINFORELATIVETOTHEFILETHEPDFCREATIONPARAMETERSWEREOPTIMIZEDFORPRINTINGEVERYCAREHASBEENTAKENTOENSURETHATTHEFILEISSUITABLEFORUSEBYISOMEMBERBODIESINTHEUNLIKELYEVENTTHATAPROBLEMRELATINGTOITISFOUND,PLEASEINFORMTHECENTRALSECRETARIATATTHEADDRESSGIVENBELOWCOPYRIGHTPROTECTEDDOCUMENTISO2008ALRIGHTSRESERVEDUNLESSOTHERWISESPECIFIED,NOPARTOFTHISPUBLICATIONMAYBEREPRODUCEDORUTILIZEDINANYFORMORBYANYMEANS,ELECTRONICORMECHANICAL,INCLUDINGPHOTOCOPYINGANDMICROFILM,WITHOUTPERMISSIONINWRITINGFROMEITHERISOATTHEADDRESSBELOWORISOSMEMBERBODYINTHECOUNTRYOFTHEREQUESTERISOCOPYRIGHTOFFICECASEPOSTALE56CH1211GENEVA20TEL41227490111FAX41227490947EMAILCOPYRIGHTISOORGWEBWWWISOORGPUBLISHEDINSWITZERLANDIISO2008ALRIGHTSRESERVEDSISMULTIUSERLICENCEABBTECHNOLOGYLTD6/12/2009ISO45212008EISO2008ALRIGHTSRESERVEDIICONTENTSPAGEFOREWORDIVINTRODUCTIONV1SCOPE12NORMATIVEREFERENCES13TERMSANDDEFINITIONS24INFORMATIONTOBESUPPLIEDBYTHEPURCHASERTOTHEELECTROPLATER241ESSENTIALINFORMATION242ADDITIONALINFORMATION35DESIGNATION351GENERAL352DESIGNATIONSPECIFICATIONS453DESIGNATIONOFTHEBASISMATERIAL454DESIGNATIONOFHEATTREATMENTREQUIREMENTS455EXAMPLESOFDESIGNATIONS56REQUIREMENTS561GENERAL562APPEARANCE563THICKNESS664POROSITY665ACCELERATEDCORROSIONTESTING666COMPOSITION667STRESSRELIEFHEATTREATMENTPRIORTOELECTROPLATING668HYDROGENEMBRITTLEMENTRELIEFHEATTREATMENTAFTERELECTROPLATING669ADHESION7610ELECTRICALPROPERTIES7611MICROHARDNESS7612SOLDERABILITY7613WEARRESISTANCE7614DUCTILITY7615UNDERCOATS7616FREEDOMFROMCONTAMINATION8617ANTITARNISHTREATMENTS87SAMPLING8ANNEXANORMATIVEREQUIREMENTSFORUNDERCOATS9ANNEXBNORMATIVEMETHODSOFMEASURINGTHETHICKNESSOFELECTROPLATEDSILVERANDSILVERALLOYCOATINGS11ANNEXCNORMATIVEADHESIONTESTS15ANNEXDNORMATIVEDETERMINATIONOFTHEPRESENCEOFRESIDUALSALTS17BIBLIOGRAPHY19SISMULTIUSERLICENCEABBTECHNOLOGYLTD6/12/2009ISO45212008EIVISO2008ALRIGHTSRESERVEDFOREWORDISOTHEINTERNATIONALORGANIZATIONFORSTANDARDIZATIONISAWORLDWIDEFEDERATIONOFNATIONALSTANDARDSBODIESISOMEMBERBODIESTHEWORKOFPREPARINGINTERNATIONALSTANDARDSISNORMALYCARRIEDOUTTHROUGHISOTECHNICALCOMMITTEESEACHMEMBERBODYINTERESTEDINASUBJECTFORWHICHATECHNICALCOMMITTEEHASBEENESTABLISHEDHASTHERIGHTTOBEREPRESENTEDONTHATCOMMITTEEINTERNATIONALORGANIZATIONS,GOVERNMENTALANDNONGOVERNMENTAL,INLIAISONWITHISO,ALSOTAKEPARTINTHEWORKISOCOLABORATESCLOSELYWITHTHEINTERNATIONALELECTROTECHNICALCOMMISSIONIECONALMATTERSOFELECTROTECHNICALSTANDARDIZATIONINTERNATIONALSTANDARDSAREDRAFTEDINACCORDANCEWITHTHERULESGIVENINTHEISO/IECDIRECTIVES,PART2THEMAINTASKOFTECHNICALCOMMITTEESISTOPREPAREINTERNATIONALSTANDARDSDRAFTINTERNATIONALSTANDARDSADOPTEDBYTHETECHNICALCOMMITTEESARECIRCULATEDTOTHEMEMBERBODIESFORVOTINGPUBLICATIONASANINTERNATIONALSTANDARDREQUIRESAPPROVALBYATLEAST75OFTHEMEMBERBODIESCASTINGAVOTEATTENTIONISDRAWNTOTHEPOSSIBILITYTHATSOMEOFTHEELEMENTSOFTHISDOCUMENTMAYBETHESUBJECTOFPATENTRIGHTSISOSHALNOTBEHELDRESPONSIBLEFORIDENTIFYINGANYORALSUCHPATENTRIGHTSISO4521WASPREPAREDBYTECHNICALCOMMITTEEISO/TC107,METALLICANDOTHERINORGANICCOATINGS,SUBCOMMITTEESC3,ELECTRODEPOSITEDCOATINGSANDRELATEDFINISHESTHISSECONDEDITIONCANCELSANDREPLACESTHEFIRSTEDITIONISO45211985,ANDALSOISO452211985,ISO452221985ANDISO452231988,WHICHHAVEBEENTECHNICALYREVISEDSISMULTIUSERLICENCEABBTECHNOLOGYLTD6/12/2009ISO45212008EISO2008ALRIGHTSRESERVEDVINTRODUCTIONELECTRODEPOSITEDSILVERANDSILVERALOYCOATINGSAREOFTENSPECIFIEDFORTHEIREXTREMELYGOODELECTRICALCONDUCTIVITY,BUTCORROSIONPROTECTIONISOFTENANADDITIONALREQUIREMENTFORELECTRICAL,ELECTRONICANDOTHERAPPLICATIONSINMANYCONDITIONSOFSERVICE,SULFIDEFILMSMAYFORMONTHECOATINGS,INCREASINGTHECONTACTRESISTANCEATTHESILVERELECTROPLATEDMATINGSURFACEANDMAKINGTHEMUNSUITABLEFORUSEINLOWVOLTAGEELECTRONICCIRCUITSSULFIDEFILMSARENOTESPECIALYDETRIMENTALTOOTHERELECTRONICAPPLICATIONSWHEREHIGHERVOLTAGEANDHIGHERCONTACTPRESSURESAREUSED,BECAUSETHEFILMSARENOTCOMPLETELYINSULATINGBECAUSETHEAPPEARANCEANDSERVICEABILITYOFELECTROPLATEDSILVERCOATINGSDEPENDONTHECONDITIONOFTHEBASISMATERIAL,AGREEMENTSHOULDBEREACHEDBETWEENINTERESTEDPARTIESTHATTHESURFACEFINISHANDROUGHNESSOFTHEBASISMATERIALARESATISFACTORYFORELECTROPLATINGELECTROPLATEDSILVERCOATINGSHAVEBEENUSEDASBEARINGSURFACESFORMANYDECADESANDAREPARTICUL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