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1、CorrosionScience53(2011)3299–3308ContentslistsavailableatScienceDirectCorrosionSciencejournalhomepage:www.elsevier.com/locate/corsciCorrosionofheattreatedmagnesiumalloyZE41a,⇑b,cbccW.C.Neil,M.Forsyth,P.C.Howlett,C.R.Hutchinson,B.R.W.HintonaDefenceScienceandTechnologyOr
2、ganisation,Melbourne,AustraliabInstituteforTechnologyResearch&Innovation,DeakinUniversity,WaurnPonds,AustraliacDepartmentofMaterialsEngineering,MonashUniversity,Clayton,AustraliaarticleinfoabstractArticlehistory:Thispaperinvestigatestheeffectofheattreatmentuponthecorro
3、sionmorphologyandmechanismofReceived4February2011ZE41alloy.Theresultsofopticalandscanningelectronmicroscopy(SEM)togetherwithpotentiodynamicAccepted6June2011polarisationrevealtheimportanceofthemicrostructureintheinitiationandpropagationofcorrosioninAvailableonline7July2
4、011anaqueousenvironment.Thecorrosionoftheheat-treatedalloyissignificantlyalteredduetochangesinthemicrostructure,specificallytheZr-richregionsandthegrainboundaryT-phase.Keywords:CrownCopyrightÓ2011PublishedbyElsevierLtd.Allrightsreserved.A.MagnesiumA.ZirconiumB.Polarisati
5、onB.SEMC.Pittingcorrosion1.Introductionalloys.InMg–Y–RE–Zralloysforexample,thepresenceofZr-richregionswithinthecentreofthegrainsresultedinagreatercorro-Magnesiumalloyshaveattractedmuchinterestmainlyduetosionresistanceoftheseregionsascomparedwiththeremainderoftheirexcel
6、lentstrength-to-weightratio–itisthelightestengi-thegrain[21–23].SongandStJohn[24]alsoreportedsimilarneeringmetal,withaspecificdensity2/3thatofaluminiumandcorrosionresistanceatZr-richregionsinaMg–RE–Zn–Zralloy.A1/4thatofsteel.However,Mgalloyshaveaninherentlyhighsus-finedi
7、stributionofZrparticlesinthealloywasthoughttoproduceceptibilitytocorrosion,whichseverelylimitstheirusage.Assuch,amorerobustoxidefilm,leadingtoincreasedcorrosionprotectionimprovedmethodsforsurfaceprotectionareconstantlybeing[22].Zrwasalsothoughttobebeneficialforcorrosionr
8、esistanceassoughtandtheseincludechemicalpassivation[1–7],anodisationitmaycombinewithimpurityelements,namelyironandnic
