ISO4042-2018-8 EN

©ISO2018Fasteners—ElectroplatedcoatingsystemsFixations—SystèmesderevêtementsélectrolytiquesINTERNATIONALSTANDARDISO4042Thirdedition2018-08ReferencenumberISO4042:2018(E)B55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)ii©ISO2018–AllrightsreservedCOPYRIGHTPROTECTEDDOCUMENT©ISO2018Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO’smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401•Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Fax:+41227490947Email:copyright@iso.orgWebsite:www.iso.orgPublishedinSwitzerlandB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)Foreword..........................................................................................................................................................................................................................................vIntroduction..............................................................................................................................................................................................................................vii1Scope.................................................................................................................................................................................................................................12Normativereferences......................................................................................................................................................................................13 Terms and definitions.....................................................................................................................................................................................24Generalcharacteristicsofthecoating............................................................................................................................................34.1Coatingmetalsoralloysandmainpurposes................................................................................................................34.2Build-upofbasicelectroplatedcoatingsystems.......................................................................................................34.3Coatingsystemsandcoatingprocesses.............................................................................................................................44.4Internalhydrogenembrittlement...........................................................................................................................................44.4.1General......................................................................................................................................................................................44.4.2Fastenerswithhardnessbelow360HV......................................................................................................54.4.3Fastenerswithhardnessequaltoandabove360HVandupto390HV.........................54.4.4Fastenerswithhardnessabove390HV.......................................................................................................54.4.5FastenersinaccordancewithISO898-1,ISO898-2andISO898-3...................................64.4.6Bakingandtestrequirementsforcase-hardenedandtemperedscrews.......................74.4.7Work-hardenedfasteners.........................................................................................................................................84.4.8Fastenerswithbainiticstructure......................................................................................................................84.5Baking.............................................................................................................................................................................................................85Corrosionprotectionandtesting........................................................................................................................................................85.1General...........................................................................................................................................................................................................85.2Neutralsaltspraytest(NSS)forzincbasedcoatingsystems.........................................................................95.3Sulfurdioxidetest(Kesternichtest).................................................................................................................................105.4Bulkhandling,automaticprocessessuchasfeedingand/orsorting,storageandtransport....................................................................................................................................................................................................116Dimensionalrequirementsandtesting.....................................................................................................................................116.1General........................................................................................................................................................................................................116.2FastenerswithISOmetricthread........................................................................................................................................116.2.1Coatingthickness.........................................................................................................................................................116.2.2Gaugeabilityandassemblability.....................................................................................................................126.3Otherfasteners....................................................................................................................................................................................126.4Testmethodsforthicknessdetermination..................................................................................................................137Mechanicalandphysicalpropertiesandtesting..............................................................................................................157.1General........................................................................................................................................................................................................157.2Appearance.............................................................................................................................................................................................157.3Corrosionresistancerelatedtotemperature............................................................................................................157.4Torque/clampforcerelationship.........................................................................................................................................157.5Determinationofhexavalentchromium........................................................................................................................158Applicabilityoftests......................................................................................................................................................................................158.1General........................................................................................................................................................................................................158.2Testsmandatoryforeachlot...................................................................................................................................................158.3Testsforin-processcontrol.......................................................................................................................................................168.4Teststobeperformedwhenspecifiedbythepurchaser.................................................................................169Designationsystem.........................................................................................................................................................................................169.1General........................................................................................................................................................................................................169.2Designationofelectroplatedcoatingsystemsfortheorder.........................................................................179.3Examplesofdesignationofhexavalentchromiumfreeelectroplatedcoatingsystemsforfasteners......................................................................................................................................................................189.4Designationoffastenerswithelectroplatedcoatingsystemsforlabelling.....................................1910Orderingrequirementsforelectroplating.............................................................................................................................19©ISO2018–AllrightsreservediiiContentsPageB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)11Storageconditions...........................................................................................................................................................................................20AnnexA(informative)Designaspectsandassemblyofcoatedfasteners..................................................................21AnnexB(informative)Hydrogenembrittlementconsideration..........................................................................................29AnnexC(informative)Corrosionprotectionrelatedtozinccoatingswithchromateconversioncoatings........................................................................................................................................................................................33AnnexD(informative)CoatingthicknessandthreadclearanceforISOmetricscrewthreads...........34AnnexE(informative)CoatingsystemstestedinaccordancewithISO9227,NSS—Evaluationofcabinetcorrosivityfortheneutralsaltspraytest.....................................................................42AnnexF(informative)ObsoletedesignationcodesforelectroplatedcoatingsystemsonfastenersaccordingtoISO4042:1999........................................................................................................................................51Bibliography.............................................................................................................................................................................................................................54iv©ISO2018–AllrightsreservedB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.InparticularthedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentsshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seewww.iso.org/directives).Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.DetailsofanypatentrightsidentifiedduringthedevelopmentofthedocumentwillbeintheIntroductionand/orontheISOlistofpatentdeclarationsreceived(seewww.iso.org/patents).Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationonthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT)seethefollowingURL:www.iso.org/iso/foreword.html.ThisdocumentwaspreparedbyTechnicalCommitteeISO/TC2,Fasteners,SubcommitteeSC14,Surfacecoatings.Thisthirdeditioncancelsandreplacesthesecondedition(ISO4042:1999),whichhasbeentechnicallyrevised.Themainchangescomparedtothepreviouseditionareasfollows:—applicationtoallfasteners,includingself-tappingandthreadformingscrews,washers,rivets,clips,etc.;—focusoncoatingsdesignedforcorrosionprotectionoffasteners;—applicationtoelectroplatedcoatingsystemswithorwithoutadditionallayers(conversioncoating,sealant,topcoat,lubricant);—specificationofminimumcorrosionresistance(whitecorrosionandredrust);—inclusionofup-to-dateknowledgeabouthydrogenembrittlementandpreventionmeasures;—definitionsspecifiedinISO1891-2;—concerningcorrosiontests,inclusionofsulfurdioxidetest(Kesternich)andcalibrationofneutralsaltspraytest;—inclusionofgaugeabilityandassemblabilityrequirements;—forthicknessdetermination,additionofadequatetestmethodsanddeletionofthebatchaveragethickness;—newdesignationsystemforallcoatingsystems;—specificationformechanicalandphysicalpropertiesandrelatedtestmethods;—informationaboutdesignaspectsandassemblyofcoatedfasteners;©ISO2018–AllrightsreservedvB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)—informationforcoatingthicknessandthreadclearanceforISOmetricscrewthreads;—informationaboutevaluationofcabinetcorrosivityfortheneutralsaltspraytest.vi©ISO2018–AllrightsreservedB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)IntroductionThisdocumentwascompletelyrevisedtotakeintoaccountnewdevelopmentsrelatedtohexavalentchromiumfreepassivations,applicationofsealantsandtopcoats,requirementsforfunctionalpropertiesaswellasresultsofresearchworktominimizetheriskofhydrogenembrittlement.©ISO2018–AllrightsreservedviiB55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21B55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21Fasteners—Electroplatedcoatingsystems1ScopeThisdocumentspecifiesrequirementsforelectroplatedcoatingsandcoatingsystemsonsteelfasteners.Therequirementsrelatedtodimensionalpropertiesalsoapplytofastenersmadeofcopperorcopperalloys.Italsospecifiesrequirementsandgivesrecommendationstominimizetheriskofhydrogenembrittlement;see4.4andAnnexB.Itmainlyappliestozincandzincalloycoatingsystems(zinc,zinc-nickel,zinc-iron)andcadmium,primarilyintendedforcorrosionprotectionandotherfunctionalproperties:—withorwithoutconversioncoating;—withorwithoutsealant;—withorwithouttopcoat;—withorwithoutlubricant(integrallubricantand/orsubsequentlyaddedlubricant).Specificationsforotherelectroplatedcoatingsandcoatingsystems(tin,tin-zinc,copper-tin,copper-silver,copper,silver,copper-zinc,nickel,nickel-chromium,copper-nickel,copper-nickel-chromium)areincludedinthisdocumentonlyfordimensionalrequirementsrelatedtofastenerswithISOmetricthreads.Thisdocumentappliestobolts,screws,studsandnutswithISOmetricthread,tofastenerswithnon-ISOmetricthread,andtonon-threadedfastenerssuchaswashers,pins,clipsandrivets.InformationfordesignandassemblyofcoatedfastenersisgiveninAnnexA.Thisdocumentdoesnotspecifyrequirementsforpropertiessuchasweldabilityorpaintability.NOTEOtherInternationalStandardsspecifydifferingelectroplatingprocesses.Forelectroplatingoffasteners,therequirementsofthisdocumentapply,unlessotherwiseagreed.2NormativereferencesThefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.ISO1456,Metallicandotherinorganiccoatings—Electrodepositedcoatingsofnickel,nickelpluschromium,copperplusnickelandofcopperplusnickelpluschromiumISO1463,Metallicandoxidecoatings—Measurementofcoatingthickness—MicroscopicalmethodISO1502,ISOgeneral-purposemetricscrewthreads—GaugesandgaugingISO1891-2,Fasteners—Terminology—Part2:VocabularyanddefinitionsforcoatingsISO2081,Metallicandotherinorganiccoatings—ElectroplatedcoatingsofzincwithsupplementarytreatmentsonironorsteelISO2082,Metallicandotherinorganiccoatings—ElectroplatedcoatingsofcadmiumwithsupplementarytreatmentsonironorsteelINTERNATIONALSTANDARDISO4042:2018(E)©ISO2018–Allrightsreserved1B55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB79384A749F347FEE5FB13B925D84A2690B31CC9C0FC36ED190EE19ACE32C3A744A72901E37B76E26B823E88656CF4EA1D634BE05A2E02040FBC18Normen-Download-Beuth-WABCOGmbH-KdNr.7600631-LfNr.8551402001-2018-08-3012:21ISO4042:2018(E)ISO2093,Electroplatedcoatingsoftin—SpecificationandtestmethodsISO2177,Metalliccoatings—Measurementofcoatingthickness—CoulometricmethodbyanodicdissolutionISO2178,Non-magneticcoatingsonmagneticsubstrates—Measurementofcoatingthickness—MagneticmethodISO3231,Paintsandvarnishes—DeterminationofresistancetohumidatmospherescontainingsulfurdioxideISO3497,Metalliccoatings—Measurementofcoatingthickness—X-rayspectrometricmethodsISO3613:2010,Metallicandotherinorganiccoatings—Chromateconversioncoatingsonzinc,cadmium,aluminium-zincalloysandzinc-aluminiumalloys—TestmethodsISO4521,Metallicandotherinorganiccoatings—Electrodepositedsilverandsilveralloycoatingsforengineeringpurposes—SpecificationandtestmethodsISO6988,Metallicandothernonorganiccoatings—SulfurdioxidetestwithgeneralcondensationofmoistureISO8991,DesignationsystemforfastenersISO9227,Corrosiontestsinartificialatmospheres—SaltspraytestsISO15330,Fasteners—Preloadingtestforthedetectionofhydrogenembrittlement—ParallelbearingsurfacemethodISO15726,Metallicandotherinorganiccoatings—Electrodepositedzincalloyswithnickel,cobaltorironISO16047,Fasteners