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1、INCH-POUNDTT-C-490EJuly22,2002__SUPERSEDINGTT-C-490DMarch31,1993FEDERALSPECIFICATIONCHEMICALCONVERSIONCOATINGSANDPRETREATMENTSFORFERROUSSURFACES(BASEFORORGANICCOATINGS)ThisspecificationwasapprovedbytheAssistantAdministratorOfficeofFederalSupplyandServices,GeneralServicesAdministration,forth
2、eusebyallFederalAgencies.1.SCOPEANDCLASSIFICATION1.1Scope.Thisspecificationcoverscleaning,surfaceconditioningforcrystalrefinementandpretreatmentbychemicalconversionofferrousmetalsandzinc/zincalloycoatedmetals.Theapplicationofchemicalconversionandpretreatmentcoatingsprovidesuniformlytextured
3、substratesforreceivingandretainingpaint,lacquer,etc.Inaddition,thisspecificationcoverssuitablecleaningprocessesfornonferroussurfaces(see6.1,6.1.2).1.2Classification.Thisspecificationcoversthefollowingcleaningmethodsandsurfacepreparationprocesses:1.2.1Surfacecleaning.Surfacecleaningshouldbeb
4、yanyofthefollowingmethodsasspecified(see6.4):MethodIMechanicalorabrasivecleaning.MethodIISolventcleaningbyimmersion,sprayorvapor.MethodIIIHotalkalinecleaningbyimmersion,sprayorelectrolyticmethods.MethodIVEmulsionwithorwithoutaddedwater.MethodVAlkalinederusting.MethodVIPhosphoricacid(alcohol
5、,detergentorsolventtypewithdetergent).1.2.1.1Ozonedepletingchemicals.Thecleaningmaterialshouldnotcontainanychemical,whichisclassifiedintheCleanAirActAmendmentsof1990asaClassIorClassIIozonedepletingsubstance.1.2.2Conversioncoatingsandpretreatments.Chemicalconversionandpretreatmentcoatingssho
6、uldbeofthefollowingtypesasspecified(see6.4).22TypeIZincphosphatesprayapplication(150mg/ftmin-500mg/ftmax)22Zincphosphateimmersionordipapplication(300mg/ftmin-500mg/ftmax)Beneficialcomments(recommendations,additions,deletions)andanypertinentdatawhichmaybeofuseinimprovingthisdocumentshouldbea
7、ddressedto:Director,U.S.ArmyResearchLaboratory,WeaponsandMaterialsResearchDirectorate,ATTN:AMSRL-WM-M,AberdeenProvingGround,MD21005-5069byusingtheStandardizationDocumentImprovementProposal(DDForm1426)appearingattheendofthisdocumentorbyletter.AMSCN/AAREAM
