Corrosion properties and corrosion evolution of as-cast AZ91 alloy with rare earth yttrium.pdf

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1、MaterialsandDesign32(2011)5043–5048ContentslistsavailableatScienceDirectMaterialsandDesignjournalhomepage:www.elsevier.com/locate/matdesShortCommunicationCorrosionpropertiesandcorrosionevolutionofas-castAZ91alloywithrareearthyttriumT.J.Luo,Y.S.Yang⇑InstituteofMetalResearch,ChineseAcad

2、emyofSciences,Shenyang110016,ChinaarticleinfoabstractArticlehistory:Thecorrosionresistancepropertyandthecorrosionevolutionofas-castAZ91alloywithrareearthYaddi-Received28March2011tionareinvestigatedbyusingimmersiontests,electrochemicalimpedancespectroscopy(EIS),andX-rayAccepted22May201

3、1photoelectronspectroscopy(XPS).TheresultsshowthattheproperamountofYinthealloyscanimproveAvailableonline2June2011thecorrosionresistanceofAZ91alloyseffectively.WiththeincrementofY,thecorrosionrateofthemod-ifiedAZ91alloysbyYadditionwasmarkedlylessthanthatofAZ91alloy.ThecorrosionrateofAZ9

4、1alloywith0.3wt.%Ywastheslightest,butfurtheradditionofYcontentover0.3wt.%makethecorrosionhea-vier.TheXPSanalysissuggeststhatthecompoundfilmofAZ91alloywith0.3wt.%YismainlycomposedofMg(OH)2andMgCO3withoutanyAl(OH)3andAl2O3,inaddition,Y2O3phaseisfoundinthecompoundfilmofAZ91alloywith0.3wt.%

5、Y,whichbenefitstostabilizethesurfacefilm.Ó2011ElsevierLtd.Allrightsreserved.1.Introduction(XPS)analysisandcorrosionbehaviorbyusingelectrochemicalimpedancespectroscopy(EIS).ItishopedthatanefficientwayMagnesiumanditsalloyshavebeenusedforawidevarietyofcanbedevelopedtoimprovethecorrosionresi

6、stanceofAZ91alloy,structuralandnonstructuralapplications,includingautomotive,andthesignificantpreliminaryresultscanpromotetheirwide-industrial,aerospace,communicationsandcomputerequipmentsspreaduseinmorefields.inreasonoftheirexcellentphysicalandmechanicalproperties,suchaslowdensity,high

7、specific-strength,highspecific-stiffness,2.Experimentalgoodcasting-ability,gooddimensionalstability,gooddampingcapacity,andwonderfulelectromagneticshieldingcharacteristicPuremagnesium(99.99wt.%),purealuminum(99.95wt.%)[1–3].Inspiteoftheattractivephysicalandmechanicalproperties,andpurezi

8、nc(99