GMW7114保护性表面处理-有机磷酸锌类.pdf

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1、VND.GHGH7l,L’4H-ENGLI,‘798m=lLlllb377llllL3l,5l1Tll3mGENERALMOTORSENGINEERINGSTANDARDSMaterialsandProcesses-MetalsIIICORROSIONPROTECTIVECOATINGSPHOSPHATE/ZINC/ORGANICTYPEGM7114M1SCOPE.Thisspecificationcoversthebasicrequire-3.4.1ForinitialapprovalandPPAPsubmiss

2、ionspartsmustmentsforanon-oilycorrosionprotectivecoatingconsistingofbeteste4lperSAlYUSCAR-1tomeetthecorrosionresistancezincphosphatetreatment,zincrichinorganicresincoatingandrequirementswhensampledperANSVASMEB18.18.2M.aluminumrichorganictopcoat.3.4.2Fornormalp

3、roduction,processesthatareinstatistical1.lThecoatingissuitableforexternallythreadedandnon-processcontrolshallyieldpartsthatarecapableofmeetingthethreadedferrouspartswherehighlevelsofcorrosionsaltsprayrequirements.protectionandfreedomfromhydrogenembrittlementar

4、erequired.Whenappliedoversteelthatistobecoupledtoalu-3.4.3Forstatisticalprocesscontrol,aNSStestofthepartsminum,thecoatingprovidesexceptionalgalvanicprotection.beingprocessedoneachlinerunningthiscoatingshallbecon-Thiscoatingisnotrecommendedforinternallythreaded

5、partsductedperANSI/ASMEB18.18.2M,Appendix1,TableBandpartswithrecessdrives.exceptsamplesizeof3piecesminimumperlinepershift.1.2Useofthisfinishonthreadedsurfaceand/orbearingsur-faceofjointscouldaffectthetorque-tensionrelationship.Itis3.4.4Sincethiscoatingisnotinc

6、ludedinthelistoffinishesrecommendedthatatorque-tensionstudyofthefastenerjointinTableB,actualcontrolchecksshallbebasedonthechemi-beperformedbeforereleasingthisfinishonanewapplication.calmanufacturer’sinstructions.Suppliershallmaintainthetestresultsinthefiletobe

7、submittedwhenrequiredbyGM.REFERENCEDSTANDARDS.3.4.5SigniflcantsurfacesfortestevaluationincludebutareGMSOOMGM4465Pnotlimitedtofastenerhead,socketrecess,semswasherandGMSlOMGM9064Pexternalnutsurface.Sharpedgesareexcluded.ThesignificantGMlOOOMGM9071Psurfacesonthre

8、adedfastenersareexposedsurfaces,excludingGM4298PANSI/ASMEB18.18.2Mthreadswhenthefastenerisininstalledposition.GM4345MsAE/uscAR-13.4.6Significantsurfacesonpartsotherthanthreadedfast