gmw 14670-2006 organic coat finish for steel wheels

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1、GMWORLDWIDEENGINEERINGSTANDARDSGMW146701Introduction1.1Scope.Organiccoatfinisheswhichensureadequateprotectionagainstcorrosiononsurfacesofroadwheels.Note:Somesectionsreferenceboth,GMWtestmethodsandlocaltestmethods.AssoonastheGMWisavailable,itsupersedesthelocaltestmethod.1.2Mission/Theme.Thisspecifica

2、tiondescribesthepropertiesoforganiccoatfinisheswhichensureadequateprotectionagainstcorrosiononsurfacesofpaintedsteelwheels.Suitablesystemsmayincludethefollowing:1.2.1SingleCoatSystem.Electropaint(epoxyoracrylicELPO).Sparewheelsandwheelsthatarefullycovered(morethan90%)canbepaintedbyepoxyelpo.Acrylice

3、lposhouldbeforwheelsthatarenotfullycoveredandforthisreasonneedhigherUV-resistance.1.2.2Multi-coatSystems.Doubleormulticoatsystems(e.g.elpoandtopcoatorelpo,basecoatandclearcoat).Theclearcoat(powderorwetcoat)shallberesistantagainstlightfastness,weatheringandchemicals.Acrylicpaintforexampleissuitable.N

4、ote:Thecoloredpaintcoatandthetopcoat(clearcoat)ofanymulti-coatsystemwhenrequiredneedonlybeappliedtosignificantand/orvisiblesurfacesasshownontherelevantengineeringdrawinge.g.thediscouter,spokerecessandrimflange.Note:Thespecificcompositionoftheorganiccoatfinishisnotapartofthespecification,howeverpretr

5、eatment,specificcompositionandminimumfilmthicknessoftheorganiccoatfinishshallbeconfirmedbythesupplierinwritingandarepartoftheinitialsampleapproval.Therelevantsuppliersaswellastheirmaterialdesignationsoftheusedpretreatmentsandmaterialsshallbecommunicated.1.3Classification/Wheeltypes.1.3.1TypeA.Single

6、CoatSystemcathodicelpoblack(onlywheelswhicharefullycoveredorsparewheels).1.3.2TypeB.SingleCoatSystemacrylicelpo.1.3.3TypeC.DoubleCoatSystem(elpo,topcoat)1.3.4TypeD.MultiCoatSystem(e.g.elpo,basecoat,clearcoat)Note:Nothinginthespecification,however,supersedesapplicablelawsandregulationsunlessaspecific

7、exemptionhasbeenobtained.2ReferencesNote:Onlythelatestapprovedstandardsareapplicableunlessotherwisespecified.2.1ExternalStandards/Specifications.ASTMG152-05SAEJ2020ASTMG153-04J20202.2GMStandards/Speci