IEC TR 61191-9-2023.docx

IECIECTR61191-9Edition1.02023-06TECHNICA1.REPORTco1.ourinsidePrintedboardassemb1.ies-Part9:E1.ectrochemica1.re1.iabi1.ityandioniccontaminationonprintedcircuitboardassemb1.iesforuseinautomotiveapp1.ications-BestpracticesTHISPUB1.ICATIONISCOPYRIGHTPROTECTEDCoPyright©2023IEC1Geneva,Switzer1.andAJ1.rightsreserved.UnteesO1.herWigespecified,nopartofthisPUb1.iCabonmaybereproducedoruti1.izedinanyformOfAanymeans,e1.ectronicormeca11<ca1.,inc1.udingpoxx>opyigandmcro1.m,WAhOSpermissioninwntngfromeitherIECofIECmemberNationa1.Committeeinthecountryoftherequester.IfycuhaveanyquestionsaboutIECcopyrighthaveanenquiryaboutOb1.aningancona1.rightStothsPUbtCagn.pte-ascontacttheaddressM11oryour1.oca1.IECmc11crNatKXI霖COmn1.inC«f<xfurtheri11formatkx.IECSeaeiariaiTd.:412291902113.ruedeVarembe,M<*cchCH-1211Geneva20*ww.iec.chSWtZedBndAbouttheIECTheInternabona1.tectrotech11>ca1.Commtsskxi(IEC)isth©1.eadinggot>a1.organizationthatpreparesandpunishes1.n½f11abona1.Standards1.ota1.1.e1.ectricai.Gectronicandre1.atedIechnoksgies.AboutIECpub1.icationsThetechnica1.contortdIECpub1.ications»$keptunderconstantreviewbyIbCIECP1.cascmakesurothatyouhavethe1.atestedition,a<xrendumoranamendmentfnhthavebeenpuUed.IECpub1.icationssearchwcbstorc.icc.chadvscarchformTheadvancedsearchenab1.estofindIECpub1.icationst>yaIafteCyotcriteria(referencenumber,texttechnica1.oommitt<jo.1.Kateogivesinformabo11onprojects,rep1.acedarriw!hdrav,npub1.ications.IECJustPub1.ished-webstore.iec.ch,Justpub1.tshedStayuptodaU?onoi1.nowIECPUbhaItiOns.JUStPuMshodde1.atea1.1.newpub1.>cat3reteased.Avai1.ab1.eon1.ineandCnCeamonthbyemai1.IECCustomerServiceCentre-webstore.1.ec.chescIfyouwhtogrveuyourfeedbackonthispub1.icationorneedfurtherasstsia11,p1.easecontacttheCustomerServiceCnure.sates©»ec.ch.IECProducts&ServicesPor1.a1.products.icc.chDiscoverourPCWCrfU1.soarcengineandrc<×Jfree1.ya1.1.mCPuWkcatkxispreviews.WithaSuOecnpt1.onyouMIatwa>shaveaccessiouptoda1.eco11W11ttai1.oredtoyourneeds.EIaetrOPed3www.Hectropedia.orgTheVVOfIcfsIeadngon1.inedictionaryondectrotechno1.ogy,nia11ingmorethan22300trm11otogica<entriesinEng1.shandFrench,withequcvaie!termsin19additiona1.1.anguages.A1.soKnOWnasteInternationa1.Etectfotechnica1.Vocabu1.ary(IEV)oi11o.IECIECTR61191-9Edtion1.02023-06TECHNICA1.REPORTco1.ourinsidePrintedboardassemb1.ies-Part9:E1.ectrochemica1.re1.iabi1.ityandioniccontaminationonprintedcircuitboardassemb1.iesforuseinautomotiveapp1.ications-BestpracticesINTERNATIONA1.E1.ECTROTECHNICA1.COMMISSIONCS31.180;3i.i90ISBN9782-32270288Warning!Makesurethatyouobtainedthispub1.icationfromanauthorizeddistributor.®ftVgvrtrMTJ>>nw*C1.Mw<n,1.>rfHdF吐cECnr加8CONTENTSFOREWORD5INTRODUCTION71 Scope82 Normativereferences83 Terms.M1.irUIiOnSandabbreviatedterms83.1 Termsanddefinitionsre1.atedtomanagement93.2 Technica1.termsanddefinitions93.3 3Abbreviatedterms104 Fai1.uremodee1.ectrochemica1.migration101 .1Backgroundofe1.ectrochemica1.migration104 2C(xnp4e×1.yofe1.ectrochemica1.migration125 3Conductiveanodicfi1.ament(CAF>andanodicmigrationphenomena(AMP)136 .4Creepcorrosion145 E1.ectrochemocaJmigrationandre1.evanceofionic11tamination155.1 Genera1.aspects155.2 Backgroundofioniccontaminationmeasurement155.3 Restrictionsand1.imitationsofIonccontaminationmeasurementf<xno-cteaassemb1.ies175.4 4Restrictionsand1.imitationsofk>iccontaminationmeasurementtorc1.eanedproducts285.5 Howtodo-Guidancetousecases375.6 Examp1.estorgoodpractice406 Surfaceirsutaonre1.iance(SIR)4361SIR-Abinationsandfau1.typrocessing436.1 Fundamenta1.parametersofinf1.uenceonSIR436.2 3HarmonizationofSIRtestconditionsforcharacterizationofmateria1.sforautomotiveappfccations516.3 DifferentstepsofSIRtesting517 ComprehensiveSIRtesting-B52-approach557.1 Genera1.aspects5572ThemainB52testboard567.3 Thetestpatterns577.4 ProcessingofB52boards597.5 Samp1.eSaeforSIRtestingotB52testcoupons597.6 6PreparationforSIRtesting597.7 SequenceofSIRtesting6078Eva1.uation628 Eam*etorgoodpractice628.1 1Methodo1.ogyformateria1.andprocessquaMication.processcontro1.6282Step1-Materia1.qua1.ification628.3 Step2-ProductdesignverificationandprocessVHidatiOn48.4 Step3-Definitionofprocesscontro1.1.imits65AnnexA(informative)S1.RmeasurementforSMTso1.derpaste-Representativeexamp1.e.67A_1Purpose87A2Equipment67A.3ExampJeofaninstructionhowtoperformthetest67Bib1.iography70Figure 1 -PrindPB1.reactionmechanismofECM11Figure 2 -Uncertaintyin1.oca1.nditionsdeterminesECMfai1.ures11Figure 3 -OccurrenceofECMfai1.uresduringhumiditytests12Figure 4 -VENNdiagramshowingthefactorsinf1.uencingECM13Figure 5 -OccurrenceofCAFandAMP14Figure 6 -Creepcorrosioncausedbycorrosivegases15Figure 7 -k>iccontaminationmeasurement16FigWe8-PdnC<