Designation:B689−97(Reapproved2018)´1StandardSpecificationforElectroplatedEngineeringNickelCoatings1ThisstandardisissuedunderthefixeddesignationB689;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Referencelinksinsubsection6.5updatededitoriallyinAugust2018.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoverstherequirementsforelectro-platednickelcoatingsappliedtometalproductsforengineer-ingapplications,forexample,foruseasabuildupformisma-chinedorwornparts,forelectronicapplications,includingasunderplatesincontactsorinterconnections,andincertainjoiningapplications.1.2Electroplatingofnickelforengineeringapplications(Note1)requirestechnicalconsiderationssignificantlydiffer-entfromdecorativeapplicationsbecausethefollowingfunc-tionalpropertiesareimportant:1.2.1Hardness,strength,andductility,1.2.2Wearresistance,1.2.3Loadbearingcharacteristics,1.2.4Corrosionresistance,1.2.5Heatscalingresistance,1.2.6Frettingresistance,and1.2.7Fatigueresistance.NOTE1—Functionalelectroplatednickelcoatingsusuallycontainabout99%nickel,andaremostfrequentlyelectrodepositedfromaWattsnickelbathoranickelsulfamatebath.Typicalmechanicalpropertiesofnickelelectroplatedfromthesebaths,andthecombinedeffectofbathoperationandsolutioncompositionvariablesonthemechanicalpropertiesoftheelectrodepositaregiveninGuideB832.Whenelectroplatednickelisrequiredtohavehigherhardnesses,greaterwearresistance,certainresidualstressvaluesandcertainlevelingcharacteristics,sulfurandothersubstancesareincorporatedinthenickeldepositthroughtheuseofcertainadditionagentsintheelectroplatingsolution.Fortheeffectofsuchadditives,seeSection4andAnnexA3.Cobaltsaltsaresometimesaddedtotheplatingsolutiontoproducehardernickelalloydeposits.1.3Thisstandarddoesnotpurporttoaddres...
