ASTM-A967-2001-不锈钢零件化学钝化处理的标准规范

Designation:A967–01e1StandardSpecificationforChemicalPassivationTreatmentsforStainlessSteelParts1ThisstandardisissuedunderthefixeddesignationA967;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.e1NOTE—Paragraph3.1.1.5wasdeletededitoriallyinApril2002.Paragraph10.2wascorrectededitoriallyinApril2002.1.Scope1.1Thisspecificationcoversseveraldifferenttypesofchemicalpassivationtreatmentsforstainlesssteelparts.Itincludesrecommendationsandprecautionsfordescaling,cleaning,andpassivationofstainlesssteelparts.Itincludesseveralalternativetests,withacceptancecriteria,forconfirma-tionofeffectivenessofsuchtreatmentsforstainlesssteelparts.1.2PracticesforthemechanicalandchemicaltreatmentsofstainlesssteelsurfacesarediscussedmorethoroughlyinPracticeA380.1.3Severalalternativechemicaltreatmentsaredefinedforpassivationofstainlesssteelparts.AppendixX1givessomenonmandatoryinformationandprovidessomegeneralguide-linesregardingtheselectionofpassivationtreatmentappropri-atetoparticulargradesofstainlesssteelbutmakesnorecommendationsregardingthesuitabilityofanygrade,treat-ment,andacceptancecriteriaforanyparticularapplicationorclassofapplications.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—FreeIronTest.1.5Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIunitsgiveninparenthesesareforinformationonly.1.6Thefollowingprecautionarycaveatpertainsonlytothetestmethodportions,Sections14through18ofthisspecifica-tion:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:A380PracticeforCleaning,Descaling,andDepassivationofStainlessSteelParts,Equipment,andSystems2B117PracticeforOperatingSaltSpray(Fog)Apparatus3B254PracticeforPreparationofandElectroplatingonStainlessSteel42.2FederalSpecification:QQ-P-35CPassivationTreatmentsforCorrosion-ResistantSteels53.Terminology3.1DefinitionofTermSpecifictoThisStandard—Itisnecessarytodefinewhichoftheseveralcommonlyuseddefinitionsofthetermpassivationwillbeusedinthisspecification.(SeeDiscussion.)3.1.1Discussion—Stainlesssteelsareautopassivatinginthesensethattheprotectivepassivefilmisformedspontaneouslyonexposuretoairormoisture.Thepresenceofexogenoussurfacecontamination,includingdirt,grease,freeironfromcontactwithsteeltooling,andsoforth,mayinterferewiththeformationofthepassivefilm.Thecleaningofthesecontami-nantsfromthestainlesssteelsurfacewillfacilitatethespon-taneouspassivationbyallowingtheoxygenuniformaccesstothesurface.Thepassivefilmmaybeaugmentedbychemicaltreatmentsthatprovideanoxidizingenvironmentforthestainlesssteelsurface.3.1.1.1Inthisspecification,passivation,unlessotherwisespecified,isdefinedasthechemicaltreatmentofastainlesssteelwithamildoxidant,suchasanitricacidsolution,forthepurposeoftheremovaloffreeironorotherforeignmatter,butwhichisgenerallynoteffectiveinremovalofheattintoroxidescaleonstainlesssteel.Inthecaseofstainlesssteelswithadditionsofsulfurforthepurposeofimprovedmachinability,1ThisspecificationisunderthejurisdictionofASTMCommitteeA01onSteel,StainlessSteel,andRelatedAlloysandisthedirectresponsibilityofSubcommitteeA01.14onMethodsofCorrosionTesting.CurrenteditionapprovedOct.10,2001.PublishedDecember2001.OriginallypublishedasA967–96.LastprevioiuseditionA967–99.2AnnualBookofASTMStandards,Vol01.03.3AnnualBookofASTMStandards,Vol03.02.4AnnualBookofASTMStandards,Vol02.05.5AvailablefromSuperintendentofDocuments,U.S.GovernmentPrintingOffice,Washington,DC20402.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.passivationmayalsoincludetheremovalofsulfidesfromthesurfaceofthemetalforthepurposeofmaximizingcorrosionresistance.3.1.1.2Theformationoftheprotectivepassivefilmonastainlesssteel,alsocalledpassivationinamoregeneralcontext,willoccurspontaneouslyinairorotheroxygen-containingenvironmentwhenthestainlesssteelsurfaceisfreeofoxidescaleandexogenousmatter.3.1.1.3Chemicaltreatments,suchassodiumdichromatesolutions,mayfacilitatethemorerapidformationofthepassivefilmonastainlesssteelsurfacealreadyfreeofscaleorforeignmatter.Suchtreatments,alsosometimescalledpassi-vationincommonusage,aredesignatedaspost-cleaningtreatmentsinthisspecificationinordertodistinguishthemfromchemicaltreatmentscapableofremovingfreeironfromstainlesssteels.3.1.1.4Thechemicaltreatmentscapableofremovingheattintoroxidescalefromstainlesssteelandcapableofdiss