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1、ElectrochimicaActa52(2007)49945001TheuseoflocalelectrochemicalprobesandsurfaceanalysismethodstostudytheelectrochemicalbehaviourandpittingcorrosionofstainlesssteelsV.Vignala,∗,H.Krawieca,b,O.Heintza,R.OltraaaICB,InstitutCarnotdeBourgogne,UMR5209CNRS-Universit´edeBourgogne,BP47870,21078DijonCedex,F
2、rancebAGH,UniversityofScienceandTechnology,DepartmentofFoundry,ul.Reymonta23,30-059Krakow,PolandReceived6September2006;receivedinrevisedform11January2007;accepted24January2007Availableonline13February2007AbstractInthispaper,theelectrochemicalmicrocelltechniqueiscombinedwithexsitu(SIMSandXPS)andin
3、situ(SVET)techniquestostudytheelectrochemicalbehaviourandpittingcorrosionofinclusion-contaningstainlesssteels.Dissolutionofmetallurgicalheterogeneities,depassivationandpittingmechanismsarefirstdiscussedin1MNaClO4,pH3,and1MNaCl,pH3,byconsideringthechemicalcompositionandmorphologyofinclusions.Theinfl
4、uenceofthechemicalcompositionofpassivefilmsontheelectrochemicalreactionsandthemicrogalvaniccouplingprocessesoccurringatthecorrosionpotentialisalsoinvestigatedonthesamespecimenmicrostructure.©2007ElsevierLtd.Allrightsreserved.Keywords:Stainlesssteel;Inclusions;Pitting;Microcapillary;XPS;SIMS;SVET1.
5、IntroductionweredetectedusingtheSECMwithI−/I3−asaredoxmedi-ator[15].TheenhancementinSECMtipcurrentmeasuredMetallicalloyshavecomplexmicrostructurewhichcouldbeat300mV/Ag/AgClin0.1MNaClaboveanactiveinclusioncomposedofdifferentmetallicphases,non-metallicinclusions,wasattributedtodissolvedS2O32−result
6、ingfromanelectro-intermetallicparticlesandsecond-phaseprecipitates.Micro-chemicaldissolutionprocessordissolvedHS−resultingfromelectrochemicalmethodswhichhavebeendevelopedovertheachemicaldissolutionprocess.Performedexperiments,usingpastyearsappearaspowerfultechniquestoselectandstudysin-UVspectroph
7、otometry,confirmedthatS2O32−ionsareformedglemetallurgicalsites(microcapillary-basedtechniques[14])duringelectrochemicaldissolution[16,17].andtomapoxydo-reductionreactions(scanningvibratingOnlyafewresearchgroupshaveattem
