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1、Designation:A780A780M?09(Reapproved2015)StardPracticefRepairofDamagedUncoatedAreasofHotDipGalvanizedCoatings1ThisstardisissuedunderthefixeddesignationA780A780Mthenumberimmediatelyfollowingthedesignationindicatestheyearof

2、iginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.Thisstardhasbeenapprovedfusebyagenciesofth

3、eU.S.DepartmentofDefense.1.Scope1.1Thispracticedescribesmethodsthatmaybeusedtorepairdamagedhotdipgalvanizedcoatingsonhardwarestructuralshapesotherproductsfabricatedpritohotdipgalvanizinguncoatedareasremainingafterinitial

4、hotdipgalvanizing.Thedamagemaybetheresultofweldingcutting(flame)inwhichcasethecoatingwillbedamagedpredominantlybyburning.Thispracticecanalsobeusedtorepairhotdipgalvanizedcoatingsdamagedbyexcessivelyroughhlingduringshippi

5、ngerection.Requirementsconcerningtherenovationofuncoatedareasremainingafterinitialhotdipgalvanizingarecontainedwithintheapplicablematerialspecification.1.2Thispracticedescribestheuseoflowmeltingpointzincalloyrepairrodspo

6、wdersmadespecificallyfthispurposetheuseofpaintscontainingzincdusttheuseofsprayedzinc(metallizing).1.3Theextentofrepairshallbelimitedtoanareamutuallyagreeabletothecontractingparties.Similarlycontractingpartiesshallagreeto

7、therepairmethodtobeused.1.4Thisspecificationisapplicabletodersineitherinchpoundunits(asA780)inSIunits(asA780M).InchpoundunitsSIunitsarenotnecessarilyexactequivalents.WithinthetextofthisspecificationwhereappropriateSIunit

8、sareshowninbrackets.Eachsystemshallbeusedindependentlyoftheotherwithoutcombiningvaluesinanyway.1.5Thisstarddoesnotpurpttoaddressthesafetyproblemsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestabl

9、ishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2A902TerminologyRelatingtoMetallicCoatedSteelProductsD520SpecificationfZincDustPigment2.2Societ

10、yfProtectiveCoatings(SSPC)Documents:3SSPCPA2MeasurementofDryPaintThicknesswithMagicGagesSSPCSP2HToolCleaningSSPCSP5NACENo.1WhiteMetalBlastCleaningSSPCSP10NACENo.2NearWhiteBlastCleaningSSPCSP11PowerToolCleaningtoBareMetal

11、3.Terminology3.1Definitions—FdefinitionsoftermsusedinthispracticerefertoTerminologyA902.4.Materials4.1Properties—Thematerialusedfrepairsshallhavethefollowingacteristics:4.1.1Oneapplicationofthematerialshallprovideacoatin

12、gthicknessofatleast2.0mils(50.8m).4.1.2Theappliedcoatingshallprovidebarrierprotectionshallpreferablybeanodictosteel.4.1.3Applicationofthecoatingmaterialshallbepossibleundershopfieldconditions.4.2Types—Therearethreetypeso

13、fmaterialthatpossesstherequiredpropertiesmaybeusedtorepairdamagedgalvanizedcoatingsasfollows:4.2.1ZincBasedSolders—Zincalloysoldersaretobeusedfrepairs.Themostcommontypesofsoldersarezinccadmiumzinctinleadzinctincopperallo

14、ys.Zinccadmiumzinctinleadalloyshaveliquidustemperaturesintherangesfrom518to527F(270to275C)446to500F1ThispracticeisunderthejurisdictionofASTMCommitteeA05onMetallicCoatedIronSteelProductsisthedirectresponsibilityofSubcommi

15、tteeA05.13onStructuralShapesHardwareSpecifications.CurrenteditionapprovedMay12015.PublishedMay2015.iginallyapprovedin1980.Lastpreviouseditionapprovedin2009asA780–09.DOI:10.1520A0780_A0780M09R15.2FreferencedASTMstardsvisi

16、ttheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3AvailablefromSocietyfProtectiveCoatings(SSPC)4024thSt.6thFloPittsburghPA15

17、2224656:www.sspc.g.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1exposureconditionscleanthesurfacetobaremetalinaccdancewithSSPCSP11asaminimum.Wherecircumstancesdonotallowbla

18、stpowertoolcleaningitispermissibletohtoolareascleaninaccdancewithSSPCSP2.Toensurethatasmoothreconditionedcoatingcanbeeffectedsurfacepreparationshallextendintotheundamagedgalvanizedcoating.Themethodextentofsurfacepreparat

19、ionshallbemutuallyagreeabletothecontractingparties.A2.1.3Iftheareatobereconditionedincludesweldsfirstremoveallweldfluxresidueweldspatter(ofasizethatcannotberemovedbywirebrushingblastcleaning)bymechanicalmeanssuchaschippi

20、nggrindingpowerscalingetc.A2.1.4Spraybrushapplythepaintscontainingzincdusttothepreparedarea.Applythepaintasinaccdancewiththemanufacturer’sprintedinstructionsinasingleapplicationemployingmultiplepassestoachieveadryfilmthi

21、cknesstobeagreeduponbetweenthecontractingparties.Allowadequatecuringtimebefesubjectingrepaireditemstoserviceconditionsinaccdancewiththemanufacturer’sprintedinstructions.A2.1.5Takethicknessmeasurementswitheitheramagicelec

22、tromagiceddycurrentgagetoensurethattheappliedcoatingisasspecifiedinaccdancewithSSPCPA2.A3.REPAIRUSINGSPRAYEDZINC(METALLIZING)A3.1Surfacestobereconditionedbyzincmetallizingshallbecleandryfreeofoilgreasecrosionproducts.A3.

23、2Iftheareatobereconditionedincludesweldsfirstremoveallfluxresidueweldspatterofasizetypethatcannotberemovedbyblastcleaningbymechanicalmeansthatischippingetc.A3.3BlastcleanthesurfacetobereconditionedinaccdancewithSSPCSP5NA

24、CENo.1whitemetal.A3.4Toensurethatasmoothreconditionedcoatingcanbeeffectedsurfacepreparationshallbeextendedintothesurroundingundamagedgalvanizedcoating.A3.5Applythecoatingtothecleandrysurfacebymeansofmetalsprayingpistolsf

25、edwitheitherzincwirezincpowder.Applythesprayedcoatingassoonaspossibleaftersurfacepreparationbefevisibledeteriationofthesurfacehasoccurred.A3.6Thesurfaceofthesprayedcoatingshallbeofunifmtexturefreeoflumpscoarseareasloosel

26、yadherentparticles.A3.7Thenominalthicknessofthesprayedzinccoatingshallbepreviouslyagreeduponbetweenthecontractingparties.A3.8Takethicknessmeasurementswitheitheramagicelectromagiceddycurrentgagetoensurethattheappliedcoati

27、ngisasspecified.REFERENCES(1)VanEijnsbergenJ.F.H.etal“ReconditioningDamagedGalvanizedSurfaces’’6thInternationalConferenceonHotDipGalvanizingInterlakenJune1961pp.128–141.(2)“RecommendedPracticesfFusedThermalSprayedDeposit

28、s’’AmericanWeldingSocietyInc.550N.W.LeJeuneRd.MiamiFL331351975.(3)SSPCPaint20“ZincRichCoatingsTypeIInganicTypeIIganic’’SteelStructuresPaintingCouncil4400FifthAve.PittsburghPA152131979.(4)MILP21035(Ships)MilitarySpecifica

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