Designation:B136−84(Reapproved2013)EndorsedbyAmericanElectroplaters’SocietyEndorsedbyNationalAssociationofMetalFinishersStandardMethodforMeasurementofStainResistanceofAnodicCoatingsonAluminum1ThisstandardisissuedunderthefixeddesignationB136;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thismethodisintendedtodeterminewhetheranodicoxidecoatingsonaluminumanditsalloys,thathaveunder-goneasealingtreatmentandcontactwithanacidsolution,arestainproofornonadsorptivewithrespecttodyes.1.2Coatingsthathavebeenproperlysealedshouldbeproofagainstadsorptionofcoloringmaterialsand,hence,“nonstain-ing”inmanytypesofservice.1.3Thismethodisapplicabletoanodiccoatingsintendedforapplicationswheretheyareexposedtotheweather,orforprotectivepurposesincorrosivemedia,andwhereresistancetostainingisimportant.NOTE1—Performanceinthistestispredictiveonlyofsusceptibilitytostainbydyes.Itisnotintendedtobepredictiveofotherfactorsinserviceperformancesuchaspittingorgeneralcorrosion.NOTE2—ForAluminumAssociationClassIandIIarchitecturalanodiccoatingsthataresealedinsolutionscontaininglessthan15ppmsilicatesor3ppmphosphates,theacidpretreatmentmaybeomitted.1.4Inthecaseofcoatingscoloredindeepshades,whereestimationoftheintensityofanyresidualdyestainisdifficult,interpretationofthetestisbasedonwhetherornottheoriginalcolorhasbeenaffectedbytheactionofthetest.1.5Thismethodisnotapplicableto:1.5.1Chromicacidtypeanodiccoatings.1.5.2Anodiccoatingsonaluminumalloyscontainingmorethan2mass%Cuor4.5mass%Si.1.5.3Anodiccoatingsthathavebeensealedonlyindichro-matesolutions.1.5.4Anodiccoatingsthathaveundergoneatreatmenttorenderthemhydrophobic.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstanda...
