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1、CorrosionScience63(2012)246–258ContentslistsavailableatSciVerseScienceDirectCorrosionSciencejournalhomepage:www.elsevier.com/locate/corsciCorrosionofalloysteelscontaining2%chromiuminCO2environmentsaa,⇑abaShaoqiangGuo,LiningXu,LeiZhang,WeiChang,MinxuLuaCorrosionandProtection
2、Center,KeyLaboratoryforEnvironmentalFracture(MOE),InstituteforAdvancedMaterialsandTechnology,UniversityofScienceandTechnologyBeijing,Beijing100083,PRChinabCNOOCResearchInstitute,DongChengdistrict,Beijing100027,PRChinaarticleinfoabstractArticlehistory:Scanningelectronmicrosc
3、opy(SEM),X-rayDiffraction(XRD),transmissionelectronmicroscopy(TEM)Received30November2011andX-rayphotoelectronspectroscopy(XPS)wereemployedtoanalyzethecorrosionscaleformedonAccepted10June2012APIX65,1Cr,2Crand3CrsteelsinCOcontainingenvironment.Theevolutionofscaleon2Crsteel2Av
4、ailableonline16June2012wascharacterizedwithelectrochemicalimpedancespectroscopy(EIS)andinsitupHmonitoring.TheresultsshowthatCrcontentcanalterthecrystallinestateofcorrosionscaleviachangingpHvalue.Local-Keywords:izedcorrosionoccurson2CrsteelwhenFeCOcrystalstripesformontheamor
5、phousscale.ThecriticalCr3A.Lowalloysteelcontentforgeneralcorrosionis3wt.%.B.WeightlossÓ2012ElsevierLtd.Allrightsreserved.B.XPSB.SEMC.PittingcorrosionC.Interfaces1.IntroductiontheformationofaCr-richFeCO3corrosionproduct(Croxi-hydrox-ide).Sun[11]reportedthatcorrosionscaleofX6
6、5steelcontainingCO2corrosionisfrequentlyencounteredinpetroleumindustry.3wt.%CrwasmainlycomposedofamorphousCr(OH)3andFeCO3.ThesearchfornewsourcesofoilandgashasbeenpushingtheTherateofgeneralcorrosionandsusceptibilitytolocalizedcorro-operationalactivitiestoharsherenvironmentun
7、derhighertemper-sionmainlydependontheformationoftheamorphousscaleonature/pressureconditionwhichdemandstheapplicationofnewlowCralloysteel.However,theformationmechanismoftheamor-tubingmaterials[1].ThenewlydevelopedCr-containinglowalloyphousscalehasnotbeenexplained.steel,which
8、fillsthegapbetweencarbonsteelsandcorrosionresis-ThecriticalCrcontentforlowalloystee
