QQC.docx
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QQC
QQ-P-35C
October28,1988
SUPERSEDING
Fed.Spec.QQ-P-35B
April5,1973
FEDERALSPECIFICATION
PASSIVATIONTREATMENTSFORCORROSION-RESISTANTSTEEL
ThisspecificationwasapprovedbytheAssistantAdministratorOfficeofFederalSupplyandServices,GeneralServicesAdministration,fortheuseofallFederalAgencies.
1.SCOPEANDCLASSIFICATION
1.1Scope.Thisspecificationcoversthedifferenttypesofpassivationtreatmentsaswellasrecommendations,guidanceandprecautionsforcleaninganddescalingcorrosion-resistantparts,components,equipmentandsystems.
1.2Purpose.Thisspecificationcoversthemethodforcleaninganddescalingofstainlesssteelpartsandoutlinesthefinalcleaningstageorpassivationtreatmentsforuseonaustenitic,ferritic,martensiticandprecipitationhardeningcorrosionresistantsteels.Engineeringdrawingsandspecificationsshouldspecifyclassificationtype(passivationtreatment)whichshouldDeusedinaccordancewith1.2.1.
1.2.1Types.
II-Mediumtemperaturenitricacidsolutionwithsodiumdichromateadditive
VI-Lowtemperaturenitricacidsolution
VII-Mediumtemperaturenitricacidsolution
VIII-Mediumtemperaturehighconcentrationnitricacidsolution
2.APPLICABLESPECIFICATIONSANDSTANDARDS
2.1Governmentdocuments.
2.1.1Specifications,standardsandhandbooks.Thefollowingspecifications,standardsandhandbooksformapartofthisdocumenttotheextentspecifiedherein.Unlessotherwisespecified,theissuesofthesedocumentsarethoselistedintheissueoftheDepartmentofDefenseIndexofSpecificationsandStandards(DoDISS)andsupplementthereto,citedinthesolicitation.
AREAMFFP
DISTRIBUTIONSTATEMENTA.Approvedforpublicrelease;distributionunlimited.
FEDERALSPECIFICATIONS
O-N-350-NitricAcid,Technical
FEDERALSTANDARDS
FED-STD-313-MaterialSafetyDataSheets,PreparationandSubmissionof
O-S-595-SodiumDichromate,Dihydrate,Technical
(ActivitiesoutsidetheFederalGovernmentmayobtaincopiesofFederalSpecifications,Standards,andHandbooksasoutlinedunderGeneralInformationintheIndexofFederalSpecificationsandStandardsandatthepricesindicatedintheIndex.TheIndex,whichincludescumulativemonthlysupplementsasissued,isforsaleonasubscriptionbasisbytheSuperintendentofDocuments,U.S.GovernmentPrintingOffice,Washington,DC20402.
(SinglecopiesofthisspecificationandotherFederalSpecificationsrequiredbyactivitiesoutsidetheFederalGovernmentforbiddingpurposesareavailablewithoutchargefromBusinessServiceCentersattheGeneralServicesAdministrationRegionalOfficesinBoston,NewYork,Washington,DC,Atlanta,Chicago,KansasCity,MO,FortWorth,Denver,SanFrancisco,LosAngeles,andSeattle,WA.)
(FederalGovernmentactivitiesmayobtaincopiesofFederalSpecifications,Standards,andHandbooksandtheIndexofFederalSpecificationsandStandardsfromestablisheddistributionpointsintheiragencies.)
MILITARYSPECIFICATIONS
MIL-S-5002-SurfaceTreatmentsandInorganicCoatingsforMetalSurfacesofWeaponsSystems
MIL-C-13924-Coating,Oxide,BlackforFerrousMetals
MILITARYSTANDARDS
MIL-STD-105-SamplingProcedureandTablesforInspectionbyAttributes
MIL-STD-753-Corrosion-ResistantSteelParts:
Sampling,InspectionandTestingforSurfacePassivation.
(Copiesofspecifications,standards,handbooks,drawings,publications,andotherGovernmentdocumentsrequiredbycontractorsinconnectionwithspecificacquisitionfunctionsshouldbeobtainedfromthecontractingactivityorasdirectedbythecontractingactivity.)
2.2Non-Governmentpublications.Thefollowingdocumentsformapartofthisdocumenttotheextentspecifiedherein.Unlessotherwisespecified,theissuesofthedocumentswhichareDoDadoptedarethoselistedintheissueoftheDODISScitedinthesolicitation.Unlessotherwisespecified,theissuesofdocumentsnotlistedintheDODISSaretheissuesofthedocumentscitedinthesolicitation(see6.2).
AMERICANSOCIETYFORTESTINGANDMATERIALS(ASTM)
ASTMA380-CleaningandDescalingStainlessSteelParts,Equipment,andSystems
ASTMB117-SaltSpray(Fog)Testing
ASTMB254-Preparationof,andElectroplatingonStainlessSteel
(ApplicationforcopiesshouldbeaddressedtotheAmericanSocietyforTestingandMaterials(ASTM),1916RaceStreet,Philadelphia,PA19103.)
3.REQUIREMENTS
3.1Materials.Thechemicalsandreagentsusedforpassivationofcorrosion-resistantsteelpartsshallproducepassivatedsurfaceswhichmeettherequirementsofthisspecification.
3.2Pretreatment.ThepretreatmentmethodsandproceduresusedpriortothepassivationtreatmentshallbeeitherinaccordancewithASTMA380orMIL-S-5002.Thesurfaceofthepartsshallbefreeofoil,grease,rust,scaleandotherforeignmatterandshallhavenodeleteriouseffectonmaterialproperties.Particularattentionshallbegiventothepretreatmentcleaningof400seriessteelstobecertainthatallsurfaceoxidation,includingrustandheattreatscale,iscompletelyremoved.Unlessotherwisespecified,cleananddescaleinaccordancewithASTMA380.Whenelectrochemicalcleaningisrequired,itshallbeperformedinaccordancewithASTM-B254.
3.3Passivationtreatment.Corrosion-resistantsteelpartsshallbepassivatedbyimmersingtheminoneofthefollowingaqueoussolutions(see6.2)andmaintainingthemwithinthetemperaturerangesandtimesdescribedbelowandinTableI.Thepartsshallbecompletelyimmersedinthesolutiontoavoidsevereetchingwhichwouldotherwiseoccurabovetheliquidline.
3.3.1TypeI.TypeIwithdrawn(see6.9)
3.3.2TypeII.TypeIIsolutionshallcontain20-25percentbyvolumeofnitricacidinaccordancewith0-N-350and2.5±0.5percentbyweightofsodiumdichromateinaccordancewith0-S-595.Partsshallbeprocessedfor20minutesatatemperaturerangebetween120-130°F(49°-54°C).
3.3.2.1Forpartsmadeofhighcarbon/highchromiumgrades(440series),straightchromiumgradeswith12-14%chromium(martensitic400series),orforcorrosion-resistantsteelscontainingrelativelylargeamounts(0.15percent)ofsulfurorselenium(forexample303,3035e,347Se,416,416Se,430F,430FSeandprecipitationhardenablesteels),typeIIsolutionshallbeused(see6.2and6.3).
3.3.3TypeIII.TypeIIIwithdrawn(see6.9).
3.3.4TypeIV.TypeIVwithdrawn(see6.9).
3.3.5TypeV.TypeVwithdrawn(see6.9).
3.3.6TypeVI.TypeVIsolutionshallcontain25-45percentbyvolumeofnitricacid(HN03)inaccordancewithO-N-350.Partsshallbeprocessedfor30minutesatatemperaturerangebetween70-90°F(21-32°C).
3.3.6.1TypeVIsolutioncanbeusedtoprocessaustenitic200and300serieschromiumnickelandchromiumgradeswith17%chromiumorgreater(withexceptionofthe440series)corrosion-resistantsteels.
3.3.7TypeVIITypeVIIsolutionshallcontain20-25percentbyvolumeofnitricacid(HN03)inaccordancewithO-N-350.Partsshallbeprocessedfor20minutesatatemperaturerangebetween120-140°F(49-60°C).
3.3.7.1TypeVIIsolutioncanbeusedtoprocesspartsmadeofthefollowingcorrosion-resistantsteels:
austenitic200and300serieschromium-nickel,chromiumgradeswith17%chromiumorgreater(except440series)(seesections6.2and6.3).
3.3.8TypeVIII.TypeVIIIsolutionshallcontain45-55percentbyvolumeofnitricacidinaccordancewithO-N-350.Partsshallbeprocessedfor30minutesatatemperaturerangebetween120-130°F(49-54°C).
3.3.8.1TypeVIIIsolutioncanbeusedforpartsmadefromhighcarbonandhighchromiumgrades(400series)andprecipitation-hardeningstainlesssteels.
TABLEI.Passivationtreatments.
Type
Temperature
Time,minimum
(minutes)
(1)
%(bywt.)
SodiumDichromate
%(byvol.)
NitricAcid
I
Withdrawn
II
120-130°F
(49-54°C)
20
2-2.5
20-25
III
Withdrawn
IV
Withdrawn
V
Withdrawn
VI
70-90°F
(21-32°C)
30
none
25-45
VII
120-150°F
(49-60°C)
20
none
20-25
VIII
120-130°F
(49-54°C)
30
none
45-55
(1)Caution:
Caremustbeexercisedasexcessivetimemaydamagethepart.
3.4Waterrinse.Immediatelyafterremovalfromthepassivatingsolutionthepartsshallbethoroughlyrinsed;finalrinseiscarriedoutincleanwater(see6.4).
3.5Chromatetreatment.Whenspecifiedandwithinonehourafterthefinalwaterrinse(3.4),allferriticandmartensiticsteelpartsshallbeimmersedinanaqueoussolutioncontaining4to6percentbyweightofsodiumdichromateinaccordancewithO-S-595,atatemperatureof140°to160°F(60-71°C)foraperiodof30minutes(see6.1.1).Thisimmersionshallbefollowedbyarinseincleanwater(see6.4).Thepartsshallthenbethoroughlydried.
3.6Finish.Thepassivatedpartsshallexhibitachemicallycleansurfaceandshallshownoetching,pittingorfrostingwhenexamined.Aslightdiscolorationwillbeallowed(see4.3and6.5).
3.7Staining.
3.7.1Waterimmersionorhighhumiditytests
3.7.2Saltsprayorcoppersulfatetests.Thesaltsrpaytestorthecoppersulfatetestmaybespecifiedinadditiontoorinlieuofeitherthewaterimmersiontestorthehighhumiditytest.Whenthesaltspraytestisspecified,thepassivatedsurfaceshallbecapableofwithstandingsaltsprayexposurewithoutevidenceofrustorstaining(see4.4.2,6.11).
3.7.2.1Coppersulfatetest
3.8Workmanship.Thepassivatedpartsshallbefreeofironcontaminationandotherforeignmaterialswhichcouldadverselyaffectthesuitability,useorlifeofthepassivatedpart(see4.3,6.13).
3.9Solutionanalysis.Theprocessorshallmaintainarecordofthecontrolproceduresusedoneachoftheprocessingsolutionsusedinthesepassivationtreatments.Solutionsshallbeanalyzedto