Designation:B630−88(Reapproved2017)StandardPracticeforPreparationofChromiumforElectroplatingwithChromium1ThisstandardisissuedunderthefixeddesignationB630;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeisintendedtoserveasaprocessguide(notasastandardprocedure)forproducingadherentelectrodepositsofchromiumonchromiumforengineeringuse.1.2Onlywell-known,generallypracticalmethodsusinghexavalentchromiumplatingbathshavebeenincluded.Someofthenewerproprietarychromiumplatingprocessesproducechromiumplatingforwhichthisprocessisunsuitable.Suppli-ersoftheprocessesshouldbeconsulted.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2B177GuideforEngineeringChromiumElectroplating3.SignificanceandUse3.1Electrodepositsofchromiumonchromiumareproducedincaseswhereitisdesiredtoobtainabetterperformingcoating,toreclaimplatedpartsthataredefective,orrestorewornchromiumcoatingstooriginaldimensions.4.PreparationofSurface4.1SurfaceFinishing—Thesmoothnessofthechromiumcoatingbeforeelectroplatingwithchromiumshouldcloselyapproximatetherequirementsofthefinishedpart.Itisusuallyachievedbyappropriategrindingwithadiamondwheel.4.2StrippingandBasisMetal—Withpreviouslyel...
