Designation:A967/A967M−17StandardSpecificationforChemicalPassivationTreatmentsforStainlessSteelParts1ThisstandardisissuedunderthefixeddesignationA967/A967M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoversseveraldifferenttypesofchemicalpassivationtreatmentsforstainlesssteelparts.Itincludesrecommendationsandprecautionsfordescaling,cleaning,andpassivationofstainlesssteelparts.Itincludesseveralalternativetests,withacceptancecriteria,forconfirma-tionofeffectivenessofsuchtreatmentsforstainlesssteelparts.1.2PracticesforthemechanicalandchemicaltreatmentsofstainlesssteelsurfacesarediscussedmorethoroughlyinPracticeA380/A380M.1.3Severalalternativechemicaltreatmentsaredefinedforpassivationofstainlesssteelparts.AppendixX1andAppendixX2givesomenonmandatoryinformationandprovidessomegeneralguidelinesregardingtheselectionofpassivationtreat-mentsappropriatetoparticulargradesofstainlesssteel.Thisspecificationmakesnorecommendationsregardingthesuit-abilityofanygrade,treatment,oracceptancecriteriaforanyparticularapplicationorclassofapplications.1.4Thetestsinthisspecificationareintendedtoconfirmtheeffectivenessofpassivation,particularlywithregardtotheremovaloffreeironandotherexogenousmatter.Thesetestsincludethefollowingpractices:1.4.1PracticeA—WaterImmersionTest,1.4.2PracticeB—HighHumidityTest,1.4.3PracticeC—SaltSprayTest,1.4.4PracticeD—CopperSulfateTest,1.4.5PracticeE—PotassiumFerricyanide-NitricAcidTest,and1.4.6PracticeF—DampClothTest,and1.4.7PracticeG—BoilingWaterImmersionTest.NOTE1—Freeirondenotesironpresentonthesurfaceoftheparts,includingbutnotlimitedtoironcontamination,iron-toolmarks,residual-ironsaltsfrompicklingsolutions,irondust,atmosphericexposure,irondeposit...
