Designation:D7803−12StandardPracticeforPreparationofZinc(Hot-DipGalvanized)CoatedIronandSteelProductandHardwareSurfacesforPowderCoating1ThisstandardisissuedunderthefixeddesignationD7803;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesmethodsofpreparingsurfacesofhot-dipgalvanizedironandsteelforpowdercoatingandtheapplicationofpowdercoatingmaterials.1.1.1Powdercoatingisadryfinishingprocesswhichusesfinelygroundparticlesofpigmentandresin,electrostaticallycharged,andsprayedontoaparttobecoated.Thepartsareelectricallygroundedsothatthechargedparticlesprojectedatthemadheretothesurfaceandareheldthereuntilmeltedandfusedintoasmoothcoatinginthecuringoven.1.1.2Hot-dipgalvanizedironorsteelisproducedbytheimmersionoffabricatedorun-fabricatedproductsinabathofmoltenzinc,asspecifiedinSpecificationA123/A123MorA153/A153M.Thispracticecoverssurfacepreparationandthermalpretreatmentofironandsteelproductsandhardwarewhichhavenotbeenpaintedorpowdercoatedpreviously(PracticeD6386).Galvanizedsurfacesmayhavebeentreatedwithprotectivecoatingstopreventtheoccurrenceofwetstoragestain.Thispracticeneitherappliestosheetgalvanizedsteelproductsnortothecoilcoatingorcontinuousrollercoatingprocesses.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A123/A123MSpecificationforZinc(Hot-DipGalvanized)CoatingsonIronandSteelProductsA153/A153MSpecificationforZincCoating(Hot-Dip)onIronandSteelHardwareA780PracticeforRepairofDamagedandUncoatedAreasofHot...
