Designation:B319−91(Reapproved2014)EndorsedbyAmericanElectroplaters’SocietyEndorsedbyNationalAssociationofMetalFinishersStandardGuideforPreparationofLeadandLeadAlloysforElectroplating1ThisstandardisissuedunderthefixeddesignationB319;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideprovidesmethodsforpreparingleadorleadalloyproductsfortheapplicationofelectroplatedorautocata-lyticcoatings.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B281PracticeforPreparationofCopperandCopper-BaseAlloysforElectroplatingandConversionCoatings3.SignificanceandUse3.1Thepreparationofleadandlead-alloysurfacesforelectroplatingisoftencriticaltothesuccessfulperformanceofelectrodepositedandautocatalyticmetalliccoatings.3.2Thisstandardoutlinestheprocessoperationproceduresandprocessingsolutionsrequired,thatleadtosatisfactoryelectrodepositedmetalliccoatings(includingundercoating)onsurfacesofleadandlead-alloys.4.NatureofLead4.1Thetensilestrengthofleadandleadalloysrangesfrom15to35MPa(2000to5000psi),therefore,themeasuredadhesionofelectroplatedcoatingscannotbegreaterthanthesevalues.4.2Difficultiesinapplyinghigh-qualityelectroplatedcoat-ingstoleadareduetothefollowingpropertiesoflead:4.2.1Theveryactivechemicalnatureoflead,leadingtotheformationofoxidefilmsinair,4.2.2Thefactthattheleadsurfacewillformfilmsofinsolubleleadsaltswithmostacidsusedinpickling,4.2.3Theeasewithwhichleaddiffusesincontactwithnonferrousmetals,and4.2.4Thepoorresistancetoplasticdeformationduringpolishing.5.ProcessPrecautions5.1Thefollowingprocessprecautionsshouldbeobserved:5.1.1...
