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1、ENGINEERINGMaterialSpecificationGM7111MSTANDARDSMetalsCorrosionProtectiveCoatingsPhoshate/Zinc/OrganicTypeSAE/USCAR-1SAE/USCAR-51Scope2.2GMStandards/Specifications.ThisspecificationcoversthebasicrequirementsGM4298PGMW3034foracorrosionprotectivecoatingprocesscon-GM4465PGMW
2、3059sistingofzincphosphatetreatment,azincrichGMW3001epoxyresincoating,andanaluminumtintor-ganictopcoating.Thecoatingmaybeappliedby3Requirementsdippingorspraying.Partconfigurationdictatestheapplicationprocess.Internallythreadedparts3.1AppearanceandCure.Coatingshallgivea(nu
3、t)shallbecoatedinacantingcentrifuge.uniformmetallicgrayappearanceandshallbePartswithoutinternalthreadscanbecoatedbyfreefromtears,sagsandexcesscoating,whichotherprocesses.affectappearanceandperformance.ItshallnotNote:Anyadditionalapprovedsourceofthisbeoilyortackytothetouch
4、.finishshallhavecantingcentrifugeapplication3.2Thickness.Coatinginthreadsofthreadedequipmentproductsshallnothaveanadverseeffecton1.1MaterialDescription.Thecoatingsystemisnormalinstallationandremovalpractices.freeofhexavalentchromate,withnohexavalent3.3Theminimumtotalcoati
5、ngthicknessshallchromateinfinalproductperGMW3059require-be15µm.ments.GMW3034willbeusedasarefereetest.Thiscoatingprocessdoesnotgeneratehydro-3.3.1Themaximumthicknessofcoating,whichgen,however,pretreatmentprocessesi.e.acidmaybeappliedtothreadsonthreadedproducts,picklingcoul
6、dcausehydrogenabsorption.Non-islimitedbythebasicthreadsize(tolerancehorelectrolyticallyappliedzincrichcoatinghashighH).Aftercoating,partsmustgagewithappropri-permeability,whichallowseffusionofhydrogenatebasicsizeGOthreadgage.Threadsmaybeduringcuringthatmighthavebeenabsorb
7、edproducedundersize/oversize(beforecoating)toduringacidpickling.accommodatethecoatingthickness,providing--`,,,,`,-`-`,,`,,`,`,,`---thefinishedproduct(aftercoating)meetsall1.2TypicalApplication.Thecoatingissuitablespecifiedmechanicalproperties.Whereme-forbolts,clips,andoth
8、erferrouspartswherechanicalpropertiesarenotspecified,undersiz-abovenormallevelsofcorrosionprotec
