【英文标准名称】:StandardPracticeforCleaning,Descaling,andPassivationofStainlessSteelParts,Equipment,andSystems
【原文标准名称】:不锈钢零件、设备及系统的清洗和除垢的标准操作规程
【标准号】:ASTMA380-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:A01.14
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:清洁处理;除垢;薄板材;钢产品;钢;带钢;金属线
【英文主题词】:austeniticstainlesssteels;cleaning;corrosion;corrosiveserviceapplications;descaling;ferriticstainlesssteels;martensiticstainlesssteels;pickling;stainlesssteels
【摘要】:1.1Thispracticecoversrecommendationsandprecautionsforcleaning,descaling,andpassivatingofnewstainlesssteelparts,assemblies,equipment,andinstalledsystems.Theserecommendationsarepresentedasproceduresforguidancewhenitisrecognizedthatforaparticularserviceitisdesiredtoremovesurfacecontaminantsthatmayimpairthenormalcorrosionresistance,orresultinthelatercontaminationoftheparticularstainlesssteelgrade,orcauseproductcontamination.Forcertainexceptionalapplications,additionalrequirementswhicharenotcoveredbythispracticemaybespecifieduponagreementbetweenthemanufacturerandthepurchaser.Althoughtheyapplyprimarilytomaterialsinthecompositionrangesoftheaustenitic,ferritic,andmartensiticstainlesssteels,thepracticesdescribedmayalsobeusefulforcleaningothermetalsifdueconsiderationisgiventocorrosionandpossiblemetallurgicaleffects.1.1.1Thetermpassivationiscommonlyappliedtoseveraldistinctlydifferentoperationsorprocessesrelatingtostainlesssteels.Inordertoavoidambiguityinthesettingofrequirements,itmaybenecessaryforthepurchasertodefinepreciselytheintendedmeaningofpassivation.Someofthevariousmeaningsassociatedwiththetermpassivationthatareincommonusageincludethefollowing:Passivationistheprocessbywhichastainlesssteelwillspontaneouslyformachemicallyinactivesurfacewhenexposedtoairorotheroxygen-containingenvironments.Itwasatonetimeconsideredthatanoxidizingtreatmentwasnecessarytoestablishthispassivefilm,butitisnowacceptedthatthisfilmwillformspontaneouslyinanoxygen-containingenvironmentprovidingthatthesurfacehasbeenthoroughlycleanedordescaled.Passivationisremovalofexogenousironorironcompoundsfromthesurfaceofastainlesssteelbymeansofachemicaldissolution,mosttypicallybyatreatmentwithanacidsolutionthatwillremovethesurfacecontaminationbutwillnotsignificantlyaffectthestainleessteelitself.ThisprocessisdescribedinageneralwayinanddefinedpreciselyinwithfurtherreferencetotherequirementsofandPartIIofthetableonacidcleaningofsteel.Unlessotherwisespecified,itisthisdefinitionofpassivationthatistakenasthemeaningofaspecifiedrequirementforpassivation.Passivationisthechemicaltreatmentofastainlesssteelwithamildoxidant,suchasanitricacidsolution,forthepurposeofenhancingthespontaneousformationoftheprotectivepassivefilm.Suchchemicaltreatmentisgenerallynotnecessaryfortheformationofthepassivefilm.PassivationdoesnotindicatetheseparateprocessofdescalingasdescribedinSection,althoughdescalingmaybenecessarybeforepassivationcanbeeffective.1.2Thispracticedoesnotcoverdecontaminationorcleaningofequipmentorsystemsthathavebeeninservice,nordoesitcoverdescalingandcleaningofmaterialsatthemill.Ontheotherhand,someofthepracticesmaybeapplicableforthesepurposes.Whilethepracticeprovidesrecommendationsandinformationconcerningtheuseofacidsandothercleaninganddescalingagents,itcannotencompassdetailedcleaningproceduresforspecifictypesofequipmentorinstallations.Itthereforeinnowayprecludesthenecessityforcarefulplanningandjudgmentintheselectionandimplementationofsuchprocedures.1.3Thesepracticesmaybeappliedwhenfreeiron,oxidescale,rust,grease,oil,carbonaceousorotherresidualchemicalfilms,soil,particles,metalchips,dirt,orothernonvolatiledepositsmightadverselyaffectthemetallurgicalorsanitaryconditionorstabilityofasurface,themechanicaloperationofapart,component,orsystem,orcontaminateaprocessfluid.Thedegreeofcleannessrequiredonasurfacedependsontheapplication.Insomecases,nomoretha......
【中国标准分类号】:H40
【国际标准分类号】:77_140_20
【页数】:13P.;A4
【正文语种】: