Designation:B253−11(Reapproved2017)StandardGuideforPreparationofAluminumAlloysforElectroplating1ThisstandardisissuedunderthefixeddesignationB253;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisguidecoverscleaningandconditioningtreatmentsusedbeforemetaldeposition(Section5),andimmersiondeposit/strikeprocedures(Section6)thatenhancetheadhesionofmetalsthataresubsequentlyappliedtoaluminumproductsbyelectrodepositionorbyautocatalyticchemicalreduction.1.2Thefollowingimmersiondeposit/strikeproceduresarecovered:1.2.1Zincimmersionwithoptionalcopperstrike(6.3).1.2.2Zincimmersionwithneutralnickelstrike(6.4).1.2.3Zincimmersionwithacetate-buffered,nickelglyco-latestrike(6.5).1.2.4Zincimmersionwithacidoralkalineelectrolessnickelstrike.1.2.5Tinimmersionwithbronzestrike(6.6).1.3Fromtheprocessingpointofview,theseproceduresareexpectedtogivedepositsonaluminumalloysthatareapproxi-matelyequivalentwithrespecttoadherence.Corrosionperfor-manceisaffectedbymanyfactors,however,includingtheprocedureusedtopreparethealuminumalloyforelectroplat-ing.1.4Thisguideisintendedtoaidelectroplatersinpreparingaluminumanditsalloysforelectroplating.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.ForspecificprecautionarystatementsseeSection7andAppendixX1.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternatio...
