Designation:D3933−98(Reapproved2010)StandardGuideforPreparationofAluminumSurfacesforStructuralAdhesivesBonding(PhosphoricAcidAnodizing)1ThisstandardisissuedunderthefixeddesignationD3933;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidedescribestherequirementsforphosphoricacidanodizingofaluminumanditsalloysforstructuraladhesivebonding.1.2Theprocedureincludedhereinisbasedonthecommer-cialpracticeofnumerousagenciesandorganizations.Themethodmayberevisedorsupplemented,asnecessary,toincludemethodsbasedonprovenperformance.1.3Thesurfacepreparationofmetalsystemsusedforqualificationandquality-controltestingoftheadhesiveshouldbeagreeduponbetweenthemanufacturerandtheuser.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Aspecificprecau-tionisgivenin5.5.2.ReferencedDocuments2.1ASTMStandards:2D907TerminologyofAdhesivesD2651GuideforPreparationofMetalSurfacesforAdhesiveBonding2.2FederalSpecifications:0-0-670OrthophosphoricAcid,Technical33.Terminology3.1Definitions—ManytermsinthisguidearedefinedinTerminologyD907.4.SignificanceandUse4.1Durableadhesivebondsbetweenmetaltometal,metaltocompositescanbeobtainedreliablyonlythroughproperselectionandcarefulcontrolofthematerialsusedandthestepsinthebondingprocess.Thepreparationofthemetallicsubstratestoobtainsurfaceswithappropriatecharacteristicsisacriticalstep.Impropersurfacepreparationcanproduceseeminglyacceptablebondsthatcandegraderapidlywithtime.Thisguidedescribesonemethodonhowtoproperlypreparealuminumsurfacescanbeobtained....
