外文翻译--高耐腐蚀涂层的纳米镍AZ91D镁合金 英文版.pdf外文翻译--高耐腐蚀涂层的纳米镍AZ91D镁合金 英文版.pdf

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YSTALLINEMATERIALS,130025,15PAPERTHESURFACEMORPHOLOGIESOFTHECOATINGSWERESTUDIEDBYSEM1INTRODUCTIONRESISTANCE,SOLDERABILITY,ELECTRICALCONDUCTIVITYORDECORATIVEAPPEARANCETHISCANBEACCOMPLISHEDBYCOATINGTHEPARTSWITHAMETALTHATHASTHEDESIREDPROPERTIESNECESSARYFORTHEELECTROLESSNICKELPLATINGANDZINCIMMERSION2ITCANBENOTEDTHATINMANYPREVIOUSREPORTSONTHEELECTROLESSPLATINGONMAGNESIUMALLOYS3–6,THENICKELIONSWERETHEPLATINGBATHSURFACECOATINGSTECHNOLOGY200MAGNESIUMISBECOMINGINCREASINGLYSIGNIFICANTASALIGHTWEIGHTMETALSTRUCTURALMATERIALWITHADENSITYOF174G/CM3INMANYINDUSTRIESAIRCRAFTCONSTRUCTION,SPACETECHNOLOGY,OPTICS,ANDAUTOMOBILEMANUFACTURING,FOREXAMPLEHOWEVER,MAGNESIUMISINTRINSICALLYHIGHLYREACTIVEANDITSALLOYSUSUALLYHAVERELATIVELYPOORCORROSIONRESISTANCE,WHICHRESTRICTSTHEAPPLICATIONOFMAGNESIUMALLOYSINPRACTICALENVIRONMENTSSO,ITISOFTENDESIRABLETOALTERTHESURFACEPROPERTIESOFAMAGNESIUMORMAGNESIUMALLOYWORKPIECEINORDERTOIMPROVEITSCORROSIONANDWEARSPECIFICAPPLICATION1SINCEMAGNESIUMISONEOFTHEMOSTELECTROCHEMICALLYACTIVEMETALS,ANYCOATINGSONMAGNESIUMALLOYSSHOULDBEASUNIFORM,ADHEREDANDPOREFREEASPOSSIBLEONEOFTHEMOSTCOSTEFFECTIVEANDSIMPLETECHNIQUESFORINTRODUCINGAMETALLICCOATINGTOASUBSTRATEISTHEPLATINGTECHNIQUES,INCLUDINGELECTROLESSPLATINGANDELECTROPLATINGFURTHERMORE,MAGNESIUMISCLASSIFIEDASADIFFICULTSUBSTRATETOPLATEMETALDUETOITSHIGHREACTIVITYASFORELECTROPLATINGONTHEMAGNESIUMALLOY,THEREARECURRENTLYTWOPROCESSESUSEDFORPLATINGONMAGNESIUMANDMAGNESIUMALLOYSDIRECTANDFESEMTHENCNICOATINGHADANAVERAGEGRAINSIZEOFABOUT40NMANDANEVIDENT{200}PREFERREDTEXTUREREVEALEDBYXRDTHEHARDNESSOFTHENCNICOATINGWASABOUT580VHN,WHICHWASFARHIGHERTHANTHATABOUT100VHNOFTHEAZ91DMAGNESIUMALLOYSUBSTRATETHEELECTROCHEMICALMEASUREMENTSSHOWEDTHATTHENCNICOATINGONTHEMAGNESIUMALLOYHADTHELOWESTCORROSIONCURRENTDENSITYANDMOSTPOSITIVECORROSIONPOTENTIALAMONGTHESTUDIEDCOATINGSONTHEMAGNESIUMALLOYFURTHERMORE,THENCNICOATINGONTHEAZ91DMAGNESIUMALLOYEXHIBITEDVERYHIGHCORROSIONRESISTANCEINTHERAPIDCORROSIONTESTILLUSTRATEDINTHEPAPERTHEREASONSFORANINCREASEINTHECORROSIONRESISTANCEOFTHENCNICOATINGONTHEMAGNESIUMALLOYSHOULDBEATTRIBUTABLETOITSFINEGRAINSTRUCTUREANDTHELOWPOROSITYINTHECOATINGD2005ELSEVIERBVALLRIGHTSRESERVEDKEYWORDSNANOCRYSTALLINENICKEL;MAGNESIUMALLOY;ELECTROPLATING;ELECTROLESSNICKEL;CORROSIONMAGNESIUMALLOYWITHDIFFERENTTHICKNESSWEREALSOPRESENTEDINTHEABSTRACTNANOCRYSTALLINENCNICOATINGWASDIRECTCURRENTELECTRODEPOSITEDONTHEAZ91DMAGNESIUMALLOYSUBSTRATEAIMEDTOIMPROVEITSCORROSIONRESISTANCEUSINGADIRECTELECTROLESSPLATINGOFNICKELASTHEPROTECTIVELAYERASCOMPARISON,TWOELECTROLESSNICOATINGSONTHEHIGHCORROSIONRESISTANCENANOCRMAGNESIUMCHANGDONGGU,JIANSHELIAN,JINGUOKEYLABOFAUTOMOBILEMATERIALS,MINISTRYOFEDUCATION,COLLEGEOFCHANGCHUNRECEIVED22MARCH2005;ACCEPTEDAVAILABLEONLINE02578972/SEEFRONTMATTERD2005ELSEVIERBVALLRIGHTSRESERVEDDOI101016/JSURFCOAT200507001CORRESPONDINGAUTHORFAX864315095876EMAILADDRESSLIANJSJLUEDUCNJLIANNICOATINGONAZ91DALLOYHE,ZHONGHAOJIANG,QINGJIANGSCIENCEANDENGINEERING,JILINUNIVERSITY,NANLINGCAMPUS,CHINAINREVISEDFORM4JULY2005AUGUST200520065413–5418WWWELSEVIERCOM/LOCATE/SURFCOATPROVIDEDBYBASICNICKELCARBONATEINDIFFERENTFROMTHEMETHODSMENTIONEDABOVE,DIRECTELECTROLESSNICKELPLATINGONTHEAZ91DMAGNESIUMALLOYWASQUICKLYASPOSSIBLEBETWEENANYTWOSTEPSOFTHETREATMENTSTHEDIRECTELECTROLESSNICKELPLATINGWITHTHEHARDNESSTESTERWITHVICKERSINDENTER,ATALOADOF100GANDDURATIONOF15SELECTROCHEMICALMEASUREMENTSWEREPERFORMEDONANELECTROCHEMICALANALYZERCHI800,SHANGHAI,CHINA,WHICHWASCONTROLLEDBYACOMPUTERANDSUPPORTEDBYSOFTWARELINEARSWEEPVOLTAMMETRYEXPERIMENTSWERECARRIEDOUTINA3WTNACLAQUEOUSSOLUTIONUSINGACLASSICTHREEELECTRODECELLWITHAPLATINUMPLATEPTASCOUNTERELECTRODEANDANAG/AGCLELECTRODE207MVVSSHEASREFERENCEELECTRODEBEFORETESTING,THEWORKINGELECTRODEWASCLEANEDINACETONEAGITATEDULTRASONICALLYFOR10MINTHEEXPOSEDAREAFORTESTINGWASOBTAINEDBYDOUBLYCOATINGWITHEPOXYRESINEP651LEAVINGANUNCOVEREDAREAOFAPPROXIMATELY1CM2THEREFERENCEANDPLATINUMELECTRODESWEREFIXEDNEARTOTHEWORKINGELECTRODEABOUT05MM,WHICHCOULDMINIMIZETHEERRORSDUETOIRDROPINTHEELECTROLYTESDURINGTHEPOTENTIODYNAMICSWEEPEXPERIMENTS,THESAMPLESWEREFIRSTIMMERSEDINTO3WTNACLSOLUTIONFORABOUT20MINTOSTABILIZETHEOPENCIRCUITPOTENTIALPOTENTIODYNAMICCURVESWERERECORDEDBYSWEEPINGTHEELECTRODEPOTENTIALFROMAVALUEOFABOUT300–400MVLOWERTOAVALUEOF500–600MVUPPERTHANTHECORROSIONPOTENTIAL,RESPECTIVELY,ATASWEEPINGRATEOF5MV/STHELOGI–ECURVESWERETIME30MINABOUT15MFIG1THETECHNICALFLOWCHARTOFTHEELECTROPLATINGNCNIONTHEAZ91DMAGNESIUMALLOYTECHNOLOGYTHICKNESSOFABOUT10AMONAZ91DMAGNESIUMALLOY7WASUSEDASTHEPROTECTIVELAYERFORFURTHERPLATINGONTHEMAGNESIUMALLOYTHEELECTROPLATINGNCNICOATINGONTHEMAGNESIUMALLOYWASDIRECTCURRENTELECTROPLATEDFROMABATHCONTAININGNICKELSULFATE,NICKELCHLORIDE,BORICACIDANDSACCHARINATAPHOF50ANDATEMPERATUREOF50CDURINGTHEELECTRODEPOSITIONPROCESS,THEANODEWASUSEDANELECTROLYTICNICKELPLATETHEOPERATIONOFELECTROPLATINGNCNICOATINGWASUNDERTAKENFORABOUT30MINWHICHWOULDGIVETHECOATINGWITHTHETHICKNESSOFABOUT15AMASCANNINGELECTRONMICROSCOPESEM,JEOLJSM5310,JAPANANDAFIELDEMISSIONSCANNINGELECTRONMICROSCOPEFESEM,JEOLJSM6700F,JAPANWEREEMPLOYEDFORTHE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
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