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1、CorrosionBehaviorofDuplexStainlessSteelsinAcidic-ChlorideSolutionsStudiedwithMicrometerResolutionMarcFemeniaiNobellDoctoralThesisDepartmentofMaterialsScienceandEngineeringDivisionofCorrosionScienceRoyalInstituteofTechnologySE-10044Stockholm,SwedenStockholm2003ISRN
2、KTH/MSE--03/08--SE+KORR/AVHISBN91-7283-459-5DoktorsavhandlingsommedtillståndavKungligaTekniskaHögskolaniStockholmframläggestilloffentliggranskningföravläggandeavtekniskdoktorsexamen,fredagenden28mars2003,kl.13:00iKollegiesalen,Valhallavägen79,KungligaTekniskaHögsk
3、olan.FakultetsopponentärDr.RolandOltra,LaboratoiredeRecherchessurlaRéactivitédesSolides,UMR5613,BP47870,21078DijonCedex,France.MarcFemeniaiNobell(2003)CorrosionBehaviorofDuplexStainlessSteelsinAcidic-ChlorideSolutionsStudiedwithMicrometerResolutionDepartmentofMate
4、rialsScienceandEngineering,DivisionofCorrosionScienceRoyalInstituteofTechnology,SE-10044,Stockholm,SwedenAbstractThelocalcorrosionbehaviorofduplexstainlesssteel(DSS)isaffectedbyawidevarietyoffactors.LocalizedcorrosionofDSSfrequentlystartsatmicrometerscaleinclusion
5、sorprecipitates,whichareoftensegregatedintheaustenite-ferriteboundaryregions.Moreover,duetothepartitioningofthekeyalloyingelementsofferrite(CrandMo)andaustenite(NandNi),thelocalinteractionsbetweenthephasesmustalsobeconsidered.Theaimofthisdoctoralstudywastoincrease
6、theknowledgeaboutthelocaldissolutionbehaviorofDSSinacidic-chlorideenvironments.Therecentdevelopmentsofnewlocalprobingtechniqueshaveopenedanewfrontierincorrosionscience,providingvaluablelocalinformationnotaccessibleinthepast.Thelocaltechniquesusedincludeelectrochem
7、icalscanningtunnelingmicroscopy(EC-STM),scanningprobeforcemicroscopy(SKPFM),magneticforcemicroscopy(MFM),andscanningAugerelectronSpectroscopy(SAES),allwithmicrometerorsub-micrometerresolution.WithEC-STM,itwaspossibletomonitorlocaldissolutionprocessesonDSSinsitu,an
8、dinrealtime.MFMwascapableofimagingthephasedistributioninDSSwithouttheneedofthetraditionalsurfaceetching,whileSKPFMrevealedthattheVoltapotentialdifferenc
