Designation:B893−98(Reapproved2013)StandardSpecificationforHard-CoatAnodizingofMagnesiumforEngineeringApplications1ThisstandardisissuedunderthefixeddesignationB893;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversrequirementsforelectrolyti-callyformedoxidecoatingsonmagnesiumandmagnesiumalloypartswhereappearance,abrasionresistance,andprotec-tionagainstcorrosionareimportant.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B117PracticeforOperatingSaltSpray(Fog)ApparatusB244TestMethodforMeasurementofThicknessofAnodicCoatingsonAluminumandofOtherNonconductiveCoatingsonNonmagneticBasisMetalswithEddy-CurrentInstrumentsB322GuideforCleaningMetalsPriortoElectroplatingB374TerminologyRelatingtoElectroplatingB487TestMethodforMeasurementofMetalandOxideCoatingThicknessbyMicroscopicalExaminationofCrossSectionB537PracticeforRatingofElectroplatedPanelsSubjectedtoAtmosphericExposureB602TestMethodforAttributeSamplingofMetallicandInorganicCoatingsB697GuideforSelectionofSamplingPlansforInspectionofElectrodepositedMetallicandInorganicCoatingsB762TestMethodofVariablesSamplingofMetallicandInorganicCoatingsD3951PracticeforCommercialPackagingD4060TestMethodforAbrasionResistanceofOrganicCoatingsbytheTaberAbraser3.Terminology3.1Definitions:3.1.1Definitions—FordefinitionsoftermsrelatingtothisspecificationseeTerminologyB374.3.1.2anodizing—anelectrolyticoxidationprocessinwhichthesurfaceofametal,whenanodic,isconvertedtoacoatinghavingdesirableprotectiveorfunctionalproperties.3.1.3hardcoat—inanodizingmagnesium,ananodicoxidecoating...
