Designation:B679−98(Reapproved2015)StandardSpecificationforElectrodepositedCoatingsofPalladiumforEngineeringUse1ThisstandardisissuedunderthefixeddesignationB679;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversrequirementsforelectrodepos-itedpalladiumcoatingscontainingatleast99.7mass%ofpalladiummetal.Compositecoatingsconsistingofpalladiumwithathingoldoverplateforapplicationsinvolvingelectricalcontactsarealsocovered.1.2Properties—Palladiumisthelightestandleastnobleoftheplatinumgroupmetals.Ithasaspecificgravityof12.0,whichissubstantiallylessthangold(19.3)andplatinum(21.5).Thisyieldsagreatervolumeorthicknessofcoatingand,consequently,somesavingofmetalweightaccompaniedbyasmallsacrificeincorrosionresistanceandreflectivity.Thefollowingtablecomparesthehardnessrangeofelectrodepos-itedpalladiumwithotherelectrodepositednoblemetalsandalloys(1,2).2ApproximateHardness(HK25)Gold50–250Palladium75–600Platinum150–550Palladium-Nickel300–650Rhodium750–1100Ruthenium600–13001.3ThevaluesstatedinSIunitsarethepreferredvalues.Valuesprovidedinparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1Thefollowingstandardsformapartofthisspecificationtotheextentreferencedherein:2.2ASTMStandards:3B183PracticeforPreparationofLow-CarbonSteelforElectroplatingB242GuideforPreparationofHigh-CarbonSteelforElec-troplatingB254PracticeforPreparationofandElectroplatingonStainlessSteelB281PracticeforPreparationofCopperandCopper-BaseAlloysforElectroplatingandConversionCoatingsB322GuideforCleaningMetalsPriortoElectroplatingB34...
