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《GM 4345M-2005 Corrosion Protective Coatings, Zinc Plating》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、ENGINEERINGMaterialSpecificationGM4345MSTANDARDSMetalsGM4344MCorrosionProtectiveCoatings,ZincPlatingDon’tUseonNewDesigns.finisheswithintheframeworkofthisspecification1Scopeasfollows:SpecificationGM4345Mdescribesthebasicre-1.thefirstoneortwodigitsdepictthepla
2、tedquirementsofelectroplatedzinccoatingsonironmetalthicknessinmicrometers,--`,,,```-`-`,,`,,`,`,,`---andsteelsubstrateswithprovisionforplating2.thenextcharacterindicatesuncoatedzincorthickness,passivationtreatment,colorandsaltsupplementarytreatmentasshowninT
3、ablesprayrequirements.Theplatingtothisspecifica-1;tionshallbechromatewithoutanydippingsolu-3.theremainingdigitsindicatecorrosionre-tion,sealer,lubricantoranyotherchemicalap-quirementstobasemetalcorrosionandzincpliedontopofchromate.corrosionproductsasspecifie
4、dinTable1.Fortheoptionaluseofelectroplatingormechani-Whencolorisspecified,thedesiredcolorisap-cal(peen)platingGM4344Misalsoincludedaspendedtothesuffix.partofthisspecification.ProvisionisalsomadeExample:GM4345M9D120/48(bright-yellow)tospecifymechanicalplating
5、only.indicatesazincplatedfinish,colordyedbrightNote1:DrawingswithGM4342Mdesignationyellow,9μmminimumthickness,passivatedorwithcustomaryunitsuffixesmaybeencountered.conversioncoatedtowithstand120hneutralsaltContactmaterialsengineertodeterminethespraywithoutev
6、idenceofbasemetalcorrosionequivalentmetricunitsuffixes(GM4345M).and48hneutralsaltspraytozinccorrosionprod-1.1MaterialDescription.Thecurrentzincplat-ucts.ingwithpassivation(K,D,BandEinTable1)con-1.4Useofthisfinishonthreadedsurfaceand/ortainshexavalentchromate
7、.Thesewillbediscon-bearingsurfaceofjointscouldaffectthetorque-tinuedeffectiveDecember2005orModelYeartensionrelationship.Itisrecommendedthata2006partswhicheverisearlier.Table2showstorque-tensionstudyofthefastenerjointbeper-thesubstitutefinishesforGMNA.formedb
8、eforereleasingthisfinishonanewap-Note2:Thesurfacelubricityofthesubstitutefin-plication.ishGMW3044withsuffix“N”issimilartothatofGM4345M.Thesurfacelubricityandotherre-2ReferencesquirementsofGMW420
