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1、CORROSIONBEHAVIOROFNI-BASEALLOYSINSUPERCRITICALWATER*1QIANGZHANG,RUITANG,CONGLI,XINLUO,CHONGSHENGLONGandKAIJUYINNationalKeyLab.ForNuclearFuelandMaterials,NuclearPowerInstituteofChinaP.O.Box436,Chendu,PRChina6100411ChinaNuclearPowerTechnologyResearchInstitute1788WestRoad,Suzhou,PRC
2、hina215004*Correspondingauthor.E-mail:xajttr@163.comReceivedJune18,2008AcceptedforPublicationSeptember22,2008Corrosionofnickel-basealloys(HastelloyC-276,Inconel625,andInconelX-750)in500°C,25MPasupercriticalwater(with10wppboxygen)wasinvestigatedtoevaluatethesuitabilityofthesealloys
3、foruseinsupercriticalwaterreactors.Oxidescalesformedonthesampleswerecharacterizedbygravimetry,scanningelectronmicroscopy/energydispersivespectroscopy,X-raydiffraction,andX-rayphotoelectronspectroscopy.Theresultsindicatethat,duringthe1000hexposure,adensespineloxidelayer,mainlyconsi
4、stingofafineCr-richinnerlayer(NiCr2O4)underneathacoarseFe-richouterlayer(NiFe2O4),developedoneachalloy.Besidesgeneralcorrosion,nodularcorrosionoccurredonalloy625possiblyresultingfromlocalattackof”clustersinthematrix.Themassgainsforallalloysweresmall,whilealloyX-750exhibitedthehigh
5、estoxidationrate,probablyduetotheabsenceofMo.KEYWORDS:Ni-BaseAlloys,SupercriticalWater,CorrosionBehavior,OxideScale1.INTRODUCTION2.EXPERIMENTALAsoneoftheGenerationIVreactorconcepts,PlatesofHastelloyC-276,Inconel625,andInconelsupercriticalwaterreactors(SCWRs)arecharacterizedX-750we
6、reprocuredfromPanzhihuaIron&SteelCo.bysimplifieddesign,smallervolume,andhigherthermalThenominalchemicalcompositionsofthematerialsareefficiencythanthatoflightwaterreactors(LWRs).showninTable1,andmicrostructuresoftheas-receivedCorrosionofstructuralmaterialsimmersedinthealloysareshow
7、ninFig.1.AlloyC-276showsasupercriticalwater(SCW)thuscontainedisexpectedtohomogeneousmicrostructurewithannealingtwinsandbemoreseverethaninLWRs.Therefore,asystematicitsaveragegrainsizeisabout40µm(Fig.1a).Thestudyoncorrosionofcandidatematerialsisneededbeforemicrostructureofalloy625re
8、vealsanaveragegrainsizetheycanbes
