Designation:B137−95(Reapproved2014)EndorsedbyAmericanElectroplaters’SocietyEndorsedbyNationalAssociationofMetalFinishersStandardTestMethodforMeasurementofCoatingMassPerUnitAreaonAnodicallyCoatedAluminum1ThisstandardisissuedunderthefixeddesignationB137;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversdeterminationofthemassperunitareaofcoatingonanodicallycoatedaluminumanditsalloys.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SignificanceandUse3.1Thistestmethodisadestructivetestproceduresuitableforqualitycontrolwithinmanufacturingoperationsforcoatingmassonanodicallycoatedaluminumandaluminumalloys.Themassofthecoatingisanapproximationofitsthicknessprovidedtheconditionsunderwhichthecoatingwasapplied,orthedensityofthecoating,areknown.Ananodiccoating’sprotectivevalueandamenabilitytocoloringbydyingorelectrolyticmethodsarerelatedtomassofcoatingperunitarea.4.Reagents4.1Thetestsolutionshallhavethefollowingmakeup:Chromicacidanhydride(CrO3)20±0.5gOrthophosphoricacidof85mass%,density1.6935±0.5mLDistilledordeionizedwaterconformingwithTypeIIIReagentWaterofSpecificationD1193,tomakeupto1000mLNOTE1—Thissolutioniscommonlyreferredtoasanondestructive“strippingsolution”foranodiccoatings.Thissolutiondissolvestheanodiccoatingwithnosignificantattackofthesubstratemetal.5.TestSpecimen5.1Prepareatestspecimenofknownsurfacearea,prefer-ablyapieceabout75mmsquare.Iftheanodiccoatingiscontaminatedorimpregnatedwithoil,grea...
