GM-9984120-Electrodeposition-Primer---Cathodic-ELP

ENGINEERINGSTANDARDSMaterialSpecificationPaints9984120ElectrodepositionPrimer-CathodicELPOForSmallParts©CopyrightApril2002GeneralMotorsCorporationAllRightsReservedApril2002OriginatingDepartment:NorthAmericanEngineeringStandards,RecordsandDocumentationPage1of31ScopeThisspecificationcoversthepretreatment,paintmaterialsandsomeprocessingrequirementsforawaterborne,black,cathodicelectrodepositionprimerusedonsmallparts.Paintdurabilityre-quirementsarealsoincluded.Smallpartsrequir-inglow,mediumandhighELPOpaintfilmthick-nessapplicationsareintendedtobecoveredbythisspecification.1.1MaterialDescription.Thisspecificationcov-ersfourtypesofprimersthatcontaindifferentamountsofheavymetals(chromiumandlead).TypeIprimerscontainbothchromiumandlead.TypeIIprimersdonotcontainchromium,andTypesIIIandIVprimersdonotcontainchromiumandlead.ItisdesirabletouseTypesIIIorIVprimersonpartsthatwillbewelded.Pretreatmentrequirementswilldifferdependingonprimerused(3.2.1.1,firstnote).PrimerTypewillbeidentifiedinthecommentsectionofMATSPC.Note:TypesIandII(lead-containing)aretargetedfordeletionfromMATSPCattheendofcalendaryear2001toassurethatpaintedproductwillmeetlead-freerequirementsbybeginningofModelYear2004.TypeIIIistargetedfordeletionfromMATSPCattheendofcalendaryear2002.1.1.1MaterialIdentification.Notapplicable.1.2Cross-ReferenceofReplacedSpecifica-tions.Subparagraphswerenotapplicable.1.3Symbol.Notapplicable.1.4TypicalApplication.Thisspecificationap-pliestoallnon-bodypartsandisnotintendedforexteriorZonesAandB(perGM4364M)bodypan-els.ThespecificationcoversallothersmallpartsthatareELPOcoatedoutsideofGMAssemblyPlants,includingthosepartsthatmayreceivesubsequenttopcoats.1.5Remarks.Notapplicable.2ReferencesNote:Onlythelatestapprovedstandardsareap-plicableunlessotherwisespecified.2.1Normative.None.2.2GM.GM4350MGM4364MGM9511PGM9535PGM9540PGMW3001GMW30599984006998412399843032.3Additional.None.3Requirements3.1RequirementsonDelivery.Subparagraphswerenotapplicable.3.2ProcessingRequirements.3.2.1ChemicalRequirements.3.2.1.1PretreatmentRequirements.CleanandpretreatwithapprovedproductsasshownintheGMCorporateMaterialsFileforsprayand/orim-mersionprocesses.OnlyphosphatematerialsapprovedtoGMEngineeringStandard9984123(zincphosphate)or9984006(ironphosphate)maybeused.Processingparametersshouldconformtothoserecommendedbythechemicalsuppliers.DIwaterrinsesmustbeproperlymaintainedinordertomeettheperformancerequirementsofthisspecification.Alternateprocessesmustre-ceiveengineeringdepartmentapproval.Note:Achromesealerisrequiredafterphosphat-ingwhenaTypeIIIprimeristobeapplied(1.1).Note:Onlinetreatmentsusingmorethanonechemicalsupplierareunacceptable.Anydevia-tiontothismusthaveengineeringapproval.Note:Effectivemodelyear2003,allELPOpaintedcomponents,bothnewandcarryover,mustuseaphosphatesealerapprovedto9984303.3.2.2MechanicalRequirements.Notapplicable.CopyrightGeneralMotorsNorthAmericaReproducedbyIHSunderlicensewithGMDocumentprovidedbyIHSLicensee=GatesRubberCo/5912509100,11/24/200413:33:31MSTQuestionsorcommentsaboutthismessage:pleasecalltheDocumentPolicyGroupat303-397-2295.--`,,,,``,`,`,`,``,`,``,``,,,,,-`-`,,`,,`,`,,`---GMENGINEERINGSTANDARDS9984120©CopyrightApril2002GeneralMotorsCorporationAllRightsReservedPage2of3April20023.2.3PhysicalRequirements.Notapplicable.3.2.4AdditionalRequirements.3.2.4.1RepairRequirements.DefectsintheELPOcoatingthatrequirerepairmustbemoistsandedwithP400gritsandpaper.Intheeventofacut-throughtobaremetalorothersignsofincom-pletecoating,therepairareamustbescuffsandedwithP400gritsandpaperandthenre-runthroughphosphateandELPO.Ifadefectispresentaftertherepair,thepartmustbescrapped.DoNotAttemptMoreThanOneRepair.3.3PerformanceRequirements.3.3.1ChemicalRequirements.Notapplicable.3.3.2MechanicalRequirements.3.3.2.1FinishDurability.FinishshallmeetGM4350MA168,unlessotherwisespecifiedontheEngineeringPartDrawing.3.3.2.2ThrowBox(GM9535P).Thereshallbeaminimumof150mmthrowmeasuredasthedis-tancefromtheimmersedopeningprovidinghidingcoveragetothepanelsurfaces.3.3.2.3ScabCorrosion(GM9511P).Maximumof3mmtotalcreepbackonphosphatedpanelsafter20cycles.3.3.2.4CyclicCorrosion(GM9540P).Consultwithappropriateengineeringpersonneltodeter-minelengthoftestanddesiredperformance.3.3.3PhysicalRequirements.3.3.3.1PaintedProductRequirements.Whenappliedovercleanedandphosphatedsurfacesofproductionparts,properlycuredcathodicELPOshallmeetthefollowingrequirementsonallcriticalsurfacesorasdesignatedontheapplicableEngi-neeringPartDrawing.3.3.3.1.1Appearance.Thevisualappearanceoftheprimermaybeanindicationofitsdurabilityperformance.Visualinspectionshallbeper-formedinawell-litareapriortoadditionalsurfacefinishing.3.3.3.1.2Color.Thecolormustbeblack,unlessotherwisedesignatedontheEngineeringPartDrawing.3.3.3.1.3Gloss.Ifaparticularglossisrequired,itshouldbespecifiedonthedrawing.3.3.3.1.4SurfaceQuality.ThebakedELPOshallpresentasmooth,uniformsurface.Noblisters,runouts,rinsingresiduesorothersurfacedefectsarepermitted.3.3.3.1.5FilmThickness.ELPOfilmthicknessesinthe10to15μmrangeareintendedforinteriorandlowerperform