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1、MaterialsandDesign55(2014)551–559ContentslistsavailableatScienceDirectMaterialsandDesignjournalhomepage:www.elsevier.com/locate/matdesInfluenceofagingtemperatureoncorrosionbehaviorofAl–Zn–Mg–Sc–Zralloya,⇑a,baaaChenLi,QinglinPan,YunjiaShi,YingWang,BoLiaSchoolofMaterialsS
2、cienceandEngineering,CentralSouthUniversity,Changsha410083,ChinabTheKeyLaboratoryofNonferrousMaterialsScienceandEngineeringofMinistryofEducation,CentralSouthUniversity,Changsha410083,ChinaarticleinfoabstractArticlehistory:Al–Zn–Mg–Sc–Zralloysheetswerepreparedusingwater
3、chillingcoppermouldingotmetallurgypro-Received24June2013cessingwhichwasprotectedbyactiveflux.Theeffectofagingtemperatureonthecorrosioncharacter-Accepted6October2013isticsofAl–Zn–Mg–Sc–Zralloywasinvestigatedbymeansofexfoliationcorrosiontesting,Availableonline17October201
4、3potentiodynamicpolarizationandelectrochemicalimpedancespectroscopy(EIS)combinedwithtrans-missionelectronmicroscopy,scanningelectronmicroscopyandopticalmicroscopyobservation.ItisKeywords:foundthatwithincreasingtheagingtemperaturethesusceptibilitytoexfoliationcorrosiond
5、ecreases.Non-ferrosmetalsandalloysElectrochemicalmeasurementsrevealthatatearlystageofimmersionintestingsolution,EISplotsofHeattreatmentsthesamplesarecomposedofacapacitivearcandaninductiveloop.InductiveloopdisappearswithMicrostructureCorrosiontheincreasingofimmersiontim
6、eandtwotimeconstantsinimpedancediagramsappear.Moreover,thetrendsofcorrosionresistancearefurtherconfirmedbypolarizationcurveandEIStest.Inaddition,transmissionelectronmicroscopyobservationsshowthattheimprovedcorrosionresistancefromincreasingagingtemperatureisduotothecoars
7、eningofmatrixandseparatedprecipitatesatthegrainboundary,andtheincreasedspacingofgrainboundaryprecipitates.Ó2013ElsevierLtd.Allrightsreserved.1.IntroductionOverthelastfewdecades,over-agedorretrogressionandre-agingtempersandhigh-temperaturepre-precipitationheattreat-Thea
8、gehardenableAl–Zn–Mgalloyshavebeenattractinggreatmenthavebeendevelopedtochangethecontinuousanodicgrainresearchinteres
