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外文翻译--镁合金化学镀镍的空隙率研究 英文版.pdf

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外文翻译--镁合金化学镀镍的空隙率研究 英文版.pdf

ELECTROLESSA,UNIVERSITYFORM23RESISTANCEAPPLIEDSURFACESCIENCE25220061INTRODUCTIONMAGNESIUMISTHELIGHTESTOFALLMETALSUSEDASTHEBASEFORCONSTRUCTIONALALLOYSTHEREQUIREMENTTOREDUCETHEWEIGHTOFCARCOMPONENTSHASTRIGGEREDRENEWEDINTERESTINMAGNESIUMINADDITION,THEUSEOFMAGNESIUMALLOYSINOTHERFIELDS,SUCHASAEROSPACE,ELECTRONICANDTELECOMMUNICATIONCOMPONENTS,HASALSOINCREASEDSTEADILYINRECENTYEARSTHEGROWTHRATEOVERTHENEXT10YEARSHASBEENESTIMATEDTOBE7PERANNUMHOWEVER,MAGNESIUMISINTRINSICALLYHIGHLYREACTIVEANDITSALLOYSUSUALLYHAVERELATIVELYPOORCORROSIONRESISTANCE,WHICHISACTUALLYONEOFTHEMAINOBSTACLESTOTHEAPPLICATIONOFMAGNESIUMALLOYS1–3ELECTROLESSNICKEL–PHOSPHORUSCOATINGONMAGNESIUMALLOYSISGENERALLYBETTERTHANTHEELECTROPLATEDDEPOSITSBECAUSEOFTHEIRENHANCEDCORROSIONRESISTANCEANDTHEIRUNIFORMITYACHIEVABLEONCOMPLEXOBJECTSELECTROLESSNICKEL–PHOSPHORUSCOATINGONMAGNESIUMALLOYSISONEOFTHEMOSTAPPROPRIATEMETHODSTOFURTHERENHANCETHECORROSIONRESISTANCECORRESPONDINGAUTHORTEL862483687731;FAX862423981731EMAILADDRESSMENGSUO66163COMJLI01694332/–SEEFRONTMATTER2005ELSEVIERBVALLRIGHTSRESERVEDDOI101016/JAPSUSC200504028KEYWORDSMAGNESIUMALLOY;ELECTROLESSNICKELPLATING;POROSITY;CORROSIONABSTRACTINTHEPRESENTPAPER,THEPOROSITYOFTHEPLATINGCOATINGWASEVALUATEDBYTHECOMBINATIONOFCORRODKOTEANDFILTERPAPER,THEEFFECTSOFTHEPLATINGSOLUTIONONTHEPOROSITYWEREINVESTIGATED,ANDTHEPROPERTIESOFTHEPOROUSCOATINGSWERESTUDIEDTHROUGHSCANNINGELECTRONMICROSCOPYSEMANDELECTROCHEMICALPOTENTIODYNAMICPOLARIZATIONTHERESULTSSHOWTHATTHEERIOTHROMEBLACKTINDICATORUSEDASANINDICATOROFTHECOATINGPOROSITYFORCOATINGSONMAGNESIUMALLOYISMOREEFFECTIVETHANMAGNESONINDICATORANDSODIUMALIZARINESULFONATEINDICATORTHEPOROSITYINELECTROLESSNICKELDEPOSITSONMAGNESIUMALLOYWASWELLEVALUATEDBYTHECOMBINATIONOFCORRODKOTEANDFILTERPAPERITISREVEALEDTHATTHEPORESEXISTONBOTHGRAINSURFACEANDGRAINBOUNDARIESANAFFECTINGTRENDOFTHEPLATINGBATHPARAMETERSONTHECOATINGPOROSITYWASOBTAINED2005ELSEVIERBVALLRIGHTSRESERVEDSTUDIESOFTHEPOROSITYINONMAGNESIUMJIANZHONGLIA,,YANWENTIANASCHOOLOFMATERIALSANDMETALLURGY,NORTHEASTBDEPARTMENTOFCHEMISTRY,SIMONFRASERRECEIVED2DECEMBER2004;RECEIVEDINREVISEDAVAILABLEONLINENICKELDEPOSITSALLOYZHENQIHUANGA,XINZHANGBERNUNIVERSITY,SHENYANG110004,CHINA,BURNABY,BC,CANADAV5A1S623APRIL2005;ACCEPTED23APRIL2005MAY2005WWWELSEVIERCOM/LOCATE/APSUSC2839–2846EACHSYSTEMHASITSADVANTAGESANDDISADVANTAGESINTHEELECTROLESSPLATINGPROCESS,ALARGEAMOUNTOFH2GASBUBBLESANDIMPURITYPARTICLESAREPRODUCED,ANDTHATMAYLEADTOTHEPOREFORMATION4–8HOWEVER,THENICKELMAGNESIUMSYSTEMISACLASSICALEXAMPLEOFCATHODICCOATINGONANANODICSUBSTRATEHENCE,COATINGPOROSITYMIGHTINFLUENCETHECORROSIONBEHAVIORANDSERVICELIFETIMEOFTHEELECTROLESSNICKELPLATEDMAGNESIUMTHEPROTECTIVEABILITYOFELECTROLESSNICKELONMANYENGINEERINGMATERIALSISLIMITEDBYTHECOATINGPOROSITYINADDITION,THEDENSITYANDTOUGHNESSOFCOATINGISINTENSIVELYINFLUENCEDBYTHECOATINGPOROSITYITISOFACTUALSIGNIFICANCETOINVESTIGATETHEPOROSITYOFTHEELECTROLESSPLATINGCOATINGONMAGNECORROSIONRESISTANCEOFNI–PCOATINGBROKENGRADUALLY13–15ACCORDINGTOACOLORREACTIONBETWEENTHEELEMENTOFTHESUBSTRATEANDTHECORROSIONSOLUTIONPASSINGTHROUGHTHEOPENINGHOLES,THECOATINGPOROSITYWASEVALUATEDBYTHECOMBINATIONOFCORRODKOTEANDFILTERPAPERINTHISRESEARCHTHEEFFECTOFTHEPLATINGPARAMETERSONTHECOATINGPOROSITYWASSTUDIEDINDETAIL2EXPERIMENTAL21ELECTROLESSPLATINGONMAGNESIUMALLOYTHESUBSTRATEMATERIALUSEDINTHERESEARCHWASAZ91DCASTINGMAGNESIUMALLOYTHECHEMICALCOMPOSITIONOFTHEALLOYISGIVENINTABLE1THESAMPLESWITHASIZEOF50MMC240MMC220MMWEREUSEDINTHEEXPERIMENTTHESUBSTRATESWEREMECHANICALLYPOLISHEDWITHEMERYPAPERSUPTO1000GRITTOENSURESIMILARSURFACEROUGHNESSTHEPOLISHEDSAMPLESWERETHOROUGHLYWASHEDWITHJLIETAL/APPLIEDSURFACESCIENCE25220062839–28462840DISTILLEDWATERRINSINGSIUMALLOYSINDETAILSOFAR,THEREAREFEWREPORTSONHOWTOEVALUATETHEPOROSITYOFTHEELECTROLESSPLATINGCOATINGONMAGNESIUMALLOYSANDWHATEFFECTOFTHEBATHPARAMETERSONTHECOATINGPOROSITY9–15THESTRUCTUREOFTHECOATINGPOROSITYCANBEEXPRESSEDASSHOWNINFIG1THESEARETWOKINDSOFPOREONEISTHEOPENINGHOLESD,E,THEOTHERSISTHECLOSEDONEA,B,CTHECLOSEDHOLESMOSTLYHAVEANEFFECTONTHEEFFECTIVETHICKNESSANDSTRESSOFTHECOATING,BUTTHEOPENINGHOLEWILLAFFECTTHECORROSIONRESISTANCEOFTHEPLATINGCOATINGTHEOPENINGHOLEDCANBECAUSEDBYTHEDEFICIENCYOFTHESUBSTRATETHEREASONISTHATTHEDEFICIENTSPOTOFMAGNESIUMALLOYSEASILYREACTSWITHTHEPLATINGBATH,PRODUCINGH2GASTHISWILLLEADTOTHEDISCONTINUOUSELECTROLESSPLATINGONTHEDEFICIENTSPOTOFMAGNESIUMALLOYSCONTINUOUSDEPOSITIONOFNI–PCOATINGRESULTSINTHEOVERLAPOFTHEPORESOTHATTOFORMTHEOPENINGHOLEEAPRIMARYCELLMAYBEFORMEDBETWEENTHECORROSIONSOLUTIONANDTHESUBSTRATETHROUGHTHEOPENINGHOLE,LEADINGTOTHEFIG1SHAPESTRUCTUREOFTHEPOROSITYOFTHECOATINGPICKLINGIN125GLC01CHROMICACIDAND110MLLC01NITRICACIDFOR45–60SDISTILLEDWATERRINSINGFLUORIDEACTIVATIONINHF250MLLC01,70HFSOLUTIONFOR10MINDISTILLEDWATERRINSINGTABLE1CHEMICALCOMPOSITIONOFTHEAZ91DALLOYINWTALMNNICUZNCASIKFEMG91017000100010640010010010001BALANCETABLE2THEPRECLEANINGPROCEDUREULTRASONICDEGREASINGINACETONEIMMERSIONIN10NAOHAQUEOUSSOLUTIONAT608CFOR5MINJLIETAL/APPLIEDSURFACESCIENCE25220062839–28462841DISTILLEDWATERBEFORETHEPRECLEANINGPROCEDUREASSHOWNI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