1、mainbinrevised2613/electrolessplatingsolutionsandlittleapplications/Inaddition/thebasicnickelcarbonateornickelacetateofareharmfultotheSurface&CoatingsTechnology2001/IntroductionTheuseofmagnesiumalloysinavarietyofapplications/particularlyinaerospace/automobiles/andmechanicalandelectroniccomponents/ha
2、sincreasedsteadilyinrecentyearsasmagnesiumalloysexhibitanattractivecombinationoflowdensity/highstrength-to-weightratio/excellentcast-ability/andgoodmechanicalanddampingcharacteristics/However/magnesiumisintrinsicallyhighlyreactiveanditsalloysusuallyhaverelativelypoorcorrosionresistance/whichisactual
3、lyoneofthemainobstaclestotheapplicationofmagnesiumalloysinpracticalenvironmentsHence/theapplicationofasurfaceengineeringtechniqueisthemostappropriatemethodtofurtherenhancethecorrosionresistance/Amongthevarioussurfaceengineeringtechniquesthatareavailableforthispurpose/coatingbyelectrolessnickelisofsp
4、ecialinterestespeciallyintheelectronicindustry/duetothepossessionofacombinationofproperties/suchasgoodcorrosionandwearresistance/deposituniformity/electricalandthermalconductivity/andsolderabilityetc/Asfarasmagnesiumalloysareconcerned/themainsaltsofelectrolessplatingsolutionsmostlyfocusattentionsonb
5、asicnickelcarbonateornickelacetate49/whichresultinhigh-cost/low-efficiency/instabilityofAbstractInthispaper/theelectrolessnickel-platingonmagnesiumalloywasstudied/usingNiSO4d6H2Oasthemainsaltintheelectrolessplatingalkalinesolutions/Theeffectsofthebufferagentandplatingparametersonthepropertiesandstru
6、cturesoftheplatingcoatingsonmagnesiumalloywereinvestigatedbymeansofscanningelectronmicroscopy(SEM)/energydispersiveX-rayspectroscopy(EDS)andX-raydiffraction(XRD)/Inaddition/theweightloss/gainofthespecimensimmersedinthetestsolutionandplatingbathwasmeasuredbyusingtheelectro-balance/toevaluatetheerosio
7、nofthealloyintheplatingsolutions/Theadhesionbetweentheelectrolessplatingcoatingsandthesubstrateswasalsoevaluated/Thecompositionsofthenon-fluorideandenvironmentallyfriendlyplatingbathwereoptimizedthroughLatinorthogonalexperiment/Thebufferagent(Na2CO3)addedtotheplatingbathwasfoundtobeusefulinincreasin
8、gthegrowthrateoftheplatingcoating/adjustingtheadhesionbetweentheelectrolessplatingcoatingsandthesubstrates/andmaintainingthepHvaluewithintherangeof8/511/5/whichisrequiredforthesuccessfulelectrolessnickel-platingonmagnesiumalloywithNiSO4d6H2Oasthemainsalt/Trisodiumcitratedihydratewasfoundtobeanessent
9、ialcomponentoftheplatingbathtoplatemagnesiumalloy/withanoptimumconcentrationof30gLC01/Theobtainedplatingcoatingsarecrystallinewithpreferentialorientationof(111)/havingadvantagessuchaslow-phosphoruscontent/highdensity/low-porosity/goodcorrosionresistanceandstrengthenedadhesion/D2004ElsevierB/V/Allrig
10、htsreserved/Keywords/Magnesiumalloy；Electrolessplating；Buffer；Corrosionresistance；AdhesionTheelectrolessnickel-platingonmagnesiumastheJianzhongLia/*/ZhongcaiShaoaSchoolofmaterialsandmetallurgy/NortheastebFacultyofEnvironmentandChemicalEngineering/ShenyangReceived23July2004；acceptedAvailableonline025
11、7-8972/$-seefrontmatterD2004ElsevierB/V/Allrightsreserved/doi/10/1016/j/surfcoat/2004/12/009*Correspondingauthor/Tel//+862483687731；fax/+862423981731/E-mailaddress/(J/Li)/alloyusingNiSO4d6H2Osalt/XinZhanga/YanwenTianarnUniversity/Shenyang110004/ChinaInstituteofTechnology/Shenyang110168/Chinaform19December2004January2005(2006)
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