BS 7371-3-2009 金属紧固件镀层.电镀锌规范

raisingstandardsworldwide™NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBSIBritishStandardsCoatingsonmetalfasteners–Part3:SpecificationsforelectroplatedzinccoatingsBS7371-3:2009BS7371-3:2009BRITISHSTANDARDPublishingandcopyrightinformationTheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.©BSI2009ISBN9780580553837ICS21.060.01,25.220.40ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceFME/9Draftforcomment08/30133820PublicationhistoryFirstpublishedSeptember1993SecondeditionAugust2009AmendmentsissuedsincepublicationDateTextaffectedBRITISHSTANDARD©BSI2009•iBS7371-3:2009ContentsForewordiiiIntroduction11Scope22Normativereferences23Termsanddefinitions34Applicationandtypeofcoating35Coating36Chromatetreatmentortopcoat67Suitabilityofcoatingsforcomponentswithparallelthreads68Informationtobedocumentedandsuppliedtothecoater79Identification7AnnexesAnnexA(normative)Coatingthicknessforthreadedparts8AnnexB(normative)Measurementofcoatingthickness9AnnexC(informative)Guidanceonproceduresthatmaybeadoptedtoaccommodatethickcoatings11Bibliography12ListoffiguresFigureB.1–Measuringareaforlocalcoatingthicknessmeasurementonfasteners9ListoftablesTable1–Nominalcoatingthicknesses4Table2–Coatingdesignationandcorrosionresistance5Table3–Designationofchromatetreatments6Table4–Designationoftri-valentbasedtreatments6TableA.1–Upperlimitsofnominalcoatingthickness8TableC.1–Minimumfundamentaldeviationrequiredtoaccommodatecoatingstoothicktobeappliedtostandardthreads,metricthreads11SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesitoiv,pages1to12,aninsidebackcoverandabackcover.BS7371-3:2009ii•©BSI2009BRITISHSTANDARDThispagedeliberatelyleftblankBRITISHSTANDARD©BSI2009•iiiBS7371-3:2009ForewordPublishinginformationThispartofBS7371ispublishedbyBSIandcameintoeffecton31August2009.ItwaspreparedbySubcommitteeFME/9/1,Mechanicalpropertiesoffasteners,undertheauthorityofTechnicalCommitteeFME/9,Fasteners.Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitssecretary.SupersessionThispartofBS7371supersedesBS7371-3:1993,whichiswithdrawn.RelationshipwithotherpublicationsOtherpublishedPartsofBS7371areasfollows:•BS7371-1,Coatingsonmetalfasteners–Specificationforgeneralrequirementsandselectionguidelines•BS7371-2,Coatingsonmetalfasteners–Part2:Specificationfortorque/clampingforcerelationship•BS7371-4,Coatingonmetalfasteners–Part4:Specificationforelectroplatednickel,nickel/chromiumandcopper/nickel/chromiumcoatings•BS7371-6,Coatingsonmetalfasteners–Part6:Specificationforhotdippedgalvanizedcoatings•BS7371-7,Coatingsonmetalfasteners–Part7:Specificationformechanicallyappliedzincandzincbasedcoatings•BS7371-8,Coatingsonmetalfasteners–Part8:Specificationforsherardizedcoatings•BS7371-9,Coatingsonmetalfasteners–Part9:Specificationforphosphateorphosphateandoilcoatings•BS7371-10,Coatingsonmetalfastenings–Part10:Specificationforphosphateorphosphateandoilcoatings.•BS7371-11,Coatingsonmetalfasteners–Part11:Specificationforzincflakenon-electrolyticallyappliedcuredcoatings1)•BS7371-12,Coatingsonmetalfasteners–Part12:RequirementsforimperialfastenersInformationaboutthisdocumentThisisafullrevisionofthestandard,andintroducesthefollowingprincipalchanges:•theoptionofspecifyingnon-hexavalentchromiumcontainingconversioncoatings;•detailsconcerningcadmiumhavebeendeletedfromthisBritishStandardduetotherestrictionsbelow.Assessedcapability.UsersofthisBritishStandardareadvisedtoconsiderthedesirabilityofqualitysystemassessmentandregistrationagainsttheappropriatestandardintheBSENISO9000seriesbyanaccreditedthird-partycertificationbody.1)Obsolete,replacedbyBSENISO10683butremainscurrent.BS7371-3:2009iv•©BSI2009BRITISHSTANDARDHazardwarningsWARNING.ThisBritishStandardcallsfortheuseofsubstancesand/orproceduresthatcanbeinjurioustohealthifadequateprecautionsarenottaken.Itrefersonlytotechnicalsuitabilityanddoesnotabsolvetheuserfromlegalobligationsrelatingtohealthandsafetyatanystage.PresentationalconventionsTheprovisionsofthisstandardarepresentedinroman(i.e.upright)type.Itsrequirementsareexpressedinsentencesinwhichtheprincipalauxiliaryverbis“shall”.Commentary,explanationandgeneralinformativematerialispresentedinsmalleritalictype,anddoesnotconstituteanormativeelement.ContractualandlegalconsiderationsThispublicationdoesnotpurporttoincludeallthenecessaryprovisionsofacontract.Usersareresponsibleforitscorrectapplication.CompliancewithaBritishStandardcannotconferimmunityfromlegalobligations.TheattentionoftheuserofthisPartofBS7371isdrawntotherestrictionsplacedonthemarketinganduseofcadmiumanditscompoundscontainedintheEnvironmentalProtection(ControlsonInjuriousSubstances)(No4)Regulations1992[1].CadmiumisexcludedfromthisStandard.TheattentionoftheuserofthisPartofBS7371isdrawntotherestrictionsplacedontheuseandsupplyofhexavalentchromiumcontainingsubstancesbyECCDirective2000/53/EConEndofLifeVehicles[2]andamendmentofAnnexIIbyCommissionDecisionJune2002[DocumentNo.C(2002)2238][3],andnon-useonMotorVehiclesmarketedafterJuly2