【astm標準】d 7396 - 14

1、Designation:D7396?14StardGuidefPreparationofNewContinuousZincCoated(Galvanized)SteelSurfacesfPainting1ThisstardisissuedunderthefixeddesignationD7396thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladopt

2、ioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisguidecoverssurfacecleaningvariousmethod

3、sftreatingnewcontinuouszinccoated(galvanized)steelsurfacesproducedbyeitherthehotdipmethodbyelectroplating.Thisguideisapplicabletoonlysurfacepreparationfapplicationofliquidpaintcoatingproductsnotfpowdercoatingapplications

4、.Thisguidecoverssurfacesthathavenotbeentreatedpreviouslyatthemilltoprovidetemparyprotectionagainststainingbymoistureotherthanbyeasilyremovedprotectiveoils(seeAppendixX1).Fpreparingsurfacesofnewweathereditemsofzinccoateds

5、teelproducedbybatchprocessingrefertoPracticeD6386.1.2ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.3Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwi

6、thitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2A780PracticefRepairofDamagedUncoated

7、AreasofHotDipGalvanizedCoatingsD4285TestMethodfIndicatingOilWaterinCompressedAirD6386PracticefPreparationofZinc(HotDipGalvanized)CoatedIronSteelProductHardwareSurfacesfPaintingD6492PracticefDetectionofHexavalentChromiumO

8、nZincZincAluminumAlloyCoatedSteel2.2SSPC—TheSocietyfProtectiveCoatingsStards:3SurfacePreparationSpecificationNo.1SolventCleaningSurfacePreparationSpecificationNo.2HToolCleaningSurfacePreparationSpecificationNo.3PowerTool

9、CleaningSurfacePreparationSpecificationNo.16BrushOffBlastCleaningofCoatedUncoatedGalvanizedSteelStainlessSteelNonFerrousMetalsPaintSpecificationNo.27BasicZincChromateVinylButyralWashPrimer3.SummaryofGuide3.1Thisguidedesc

10、ribessurfacecleaningtreatmentmethodsthatprovidegalvanizedsurfacessuitablefpaintingspecificallysothatanappliedcoatingsystemcandeveloptheadhesionnecessaryfsatisfactyservicelife.3.2Eightmethodsoftreatment(Note1Note2)arecove

11、redasfollows:3.2.1MethodA—ZincPhosphateTreatment.3.2.2MethodB—ChromateTreatment.3.2.3MethodC—AqueousChromicganicTreatment.3.2.4MethodD—AcidCuringResinousTreatment.3.2.5MethodE—AnnealingHeatTreatments.3.2.6MethodF—Amphous

12、ComplexOxideTreatment.3.2.7MethodG—AbrasiveBlastCleaning.3.2.8MethodH—FluroTitanicZirconicPolymerTreatment.NOTE1—Materialsemployedinthesemethodsoftreatmentareavailablefromanumberofsourcesasproprietarycompoundsmethods.ion

13、maybemadefromavailablesources.NOTE2—Theuseofsolventscontainingvolatileganiccompoundstopreparetreatthesurfaceofmetalcomponentscontributestoairpollutioninthesamemannerastheuseofsolventcontainingpaintscoatings.Theuserofthis

14、guidemustdeterminetheapplicabilityofappropriateregulationsgoverningthevolatileganiccompoundcontentofthematerialsusedinashopapplication(MiscellaneousMetalParts)fieldpainting(Architectural)specificprocessindustry.3.3Variat

15、ionsinsurfacepreparationproduceendconditionsthatdifferhencedonotnecessarilyyieldidenticalresultswhenpaintsaresubsequentlyapplied.Serviceconditionswill1ThisguideisunderthejurisdictionofASTMCommitteeD01onPaintRelatedCoatin

16、gsMaterialsApplicationsisthedirectresponsibilityofSubcommitteeD01.46onIndustrialProtectiveCoatings.CurrenteditionapprovedDec.12014.PublishedJanuary2015.iginallyapprovedin2007.Lastpreviouseditionapprovedin2008asD7396–08.D

17、OI:10.1520D739614.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3AvailablefromSocietyfProtectiv

18、eCoatings(SSPC)4024thSt.6thFloPittsburghPA152224656:www.sspc.g.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1coatings.Thefi

19、lmhasgoodadhesiontothemetalsubstratepromotesgoodadhesionofmostsubsequentganiccoatingstoitself.Twotypesofthistreatmentareavailable:(1)twopackagematerialtobeusedthedayitismixed(2)onepackagematerialthathaspackagestabilitydo

20、esnotrequiredailypreparation.NOTE4—Itmaybedifficulttocontrolthedryfilmthicknesswithintheparametersofthisspecificationwhenappliedbybrushrollerdipcoater.5.5MethodEAnnealingHeatTreatments—Underthecontrolledconditionsobtaina

21、bleinamillhotdipgalvanizedsurfacesmaybeconvertedalloyedwiththebasemetaltochangethesurfaceacterofthezinccoatingmakeitmereceptivetopaint.ThissurfacecanbefurtherimprovedbytreatinginaccdancewithMethodsABCD.5.6MethodFAmphousC

22、omplexOxideTreatment—Thissurfacetreatmentmethodconsistsofreactingthezincsurfaceinanalkalinesolutioncontainingheavymetalionsfaperiodof5to30sat45to70C(115to160F).Thesurfaceofthezincisconvertedtoanonmetallicamphouscomplexox

23、idecoatingthatinhibitscrosionincreasestheadhesiondurabilityofpaintfinishes.Thetreatmentcanbecarriedoutbyimmersionsprayapplication.5.7MethodGAbrasiveBlastTreatment—Abrasivesweepbrushblastinginaccdancewithproceduresdescrib

24、edinSSPCSP16fthesurfacepreparationmethodsonlyusesarapidnozzlemovementrougheningthegalvanizedsurfaceprofile.Theabrasivematerialmustbechosencarefullytoprovideastrippingactionthatremovestheoxidereactionproductswithoutexcess

25、iveremovalofthezinc.Oneofthematerialssuccessfullyusedisaluminummagnesiumsilicate.Particlesizeshouldbeintherangeof200to500micrometers(8to20mils).OthermaterialsthatcanbeusedaresoftmineralsswithaMohshardnessof5lessganicmedi

26、asuchascncobswalnutshellscundumlimestone.Freactivesteelwithallalloycoatingswhichmayhavecompromisedadhesioneventherelativelylowpressureblastof0.15to0.25MPa(20to40psi)canbetoogreatcausingadhesionproblems.Caremustbetakentol

27、eavezinclayersintact.Oilcontaminationofthecompressedairwilldegradeadhesiontosweepblastedhotdipgalvanizedsurfaces(TestMethodD4285).Careisneededinavertingthistypeofcontamination.Thepurposeofsweepblastingistodefmnotremoveth

28、egalvanizedmetal.AnyareafallingbelowtherequiredzincthicknessbefeaftersweepblastingshallberepairedinaccdancewithPracticeA780.Sweepblastingofzincshallbenotlessthan110m2h(1200ft2h)usingtheseabrasivematerials.Thesubstratesha

29、llbemaintainedatatemperatureofatleast3C(5F)abovethedewpointtemperature.5.8MethodHFluroTitanicZirconicPolymerTreatment—ThistreatmentmethodisachromiumfreeanalogofthesolutionscommonlyemployedunderMethodC.Itconsistsofacombin

30、ationofpoly(acrylicacid)withcopolymerresins0.01to0.1MH2TiF6H2ZrF6.Thesolutioncanbeappliedtothegalvanizedsteelsurfacebyspraydipsqueegeerollercoating.Theexcesssolutionisspunoffotherwiseremovedfromthemetalsurfaceresultingin

31、adryinplacesurfacetreatment.Thefinishedsurfaceconsistsofacomplexoxidepolymermatrixboundtothezincmetal.5.9CoatingApplicationTimeFrame—Blowdownpreparedsurfacewithcleancompressedairfollowingsurfacepreparation.Insomeatmosphe

32、ricconditionssuchashighhuityhightemperatureboththefmationofzincoxideonthefreshlypreparedsurfaceswillbeginveryquickly.Zincoxidefmationisnotvisibletotheunaidedeyetherefeinanyatmospherepaintingshouldbestartedwithinanhouraft

33、ersurfacepreparation.6.Keywds6.1acidcuringresinoustreatmentamphouscomplexoxidetreatmentannealingheattreatmentchromatechromatetestchromicganictreatmentgalvanizephosphatepretreatmentsurfacetreatmentzincAPPENDIX(NonmatyInfm

34、ation)X1.IDENTIFYINGTHEPRESENCEOFREMOVINGCHROMATETREATMENTSUSEDASWETSTAGE(ALSOCALLEDHUSTAGE)STAININHIBITSX1.1Oneoftheinhibitsusedbyproducersofzinccoatedsteelisahexavalentchromiumsolution.Thistreatmentpreventssomeofthetre

35、atmentmethodsfromwkingproperly.X1.2Ifzinccoatedsteeltobepaintedisgalvanizedtoderthedershouldprohibittheuseofhexavalentchromiumhustagestaintreatments.X1.3Hexavalentchromiumtreatmentcanberemovedfromgalvanizedsurfacesbyoneo

36、fthefollowingthreemethods:X1.3.1Weatheringthesurfacesfsixmonths.X1.3.2Abradingthesurfacesbylightsing.X1.3.3Brushoffabrasiveblastcleaning.X1.4Thepresenceofhexavalentchromiumongalvanizedsurfacescanbedeterminedbyspottesting