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1、Availableonlineatwww．sciencedirect．com．一，，．Transactionsof·：：，ScienceDirectNonferrousMetals黌SocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)1981—1988www．tnmsc．caMicrostrucmreanddepositionalmechanismofNi_——Pcoatingswithnano-ceriaparticlesbypulseelectrodepositionZHOUXiao—wei，SHENYi．
2、fu，JINHui．ming，ZHENGYing．ying1．CollegeofMaterialsScienceandTechnology,NanjingUniversityofAeronauticsandAstronautics，Nanjing210016，China；2．CollegeofMechanicalEngineering，YangzhouUniversity,Yangzhou225127，ChinaReceived10August201I；accepted28October2011Abstract：Nano-CeO2(RE)particleswereco-
3、depositedintoNi—Pbinarycompositecoatingsbyapplyingpulsecurrent(PC)underultrasonicfU)field．Morphology,chemicalcontentandcrystalmicrostructurewerecharacterizedbyenvironmentalscanningelectronmicroscopyfE—SEM)withenergydispersiveX-rayanalysis(EDXA)，xRDdiffractometryandtransmissionelectronmic
4、roscopy(TEM)．ExperimentalresultsshowthatNi-Pcoatingreinforcedwim15egLnano—CeO2，inamorphousstateandwithcompactsnuctLlre，canbeimprovedinthemicrohardnessfromHV02580toHV02780byannealingat600。Cfor2h．ThehighestcontentofcodepositedCeanddepositionratecanreach2．3％and68run／h，respectively~Furthermo
5、re．theefectofREadsorptionandpulseoverpotentialondepositionalmechanismwasinvestigated．n．CeO2particlesorCe4+ionswithstrongadsorptioncapacityactedasthecatalyticnucleustoimprovedensificationefectively．Duringannealingat600。Cfor2h，l,／．CeO2particleswilluniformlyadsorboncrystalgraintopreferentia
6、llypadandhealupgapsofcrackingNiboundaries，promotingdispersionstrengtheningwithrefiner-grainedstmcn．Keywords：Ni-Pcoating；pulseelectrodeposition；overpotential；depositionalmechanism；CeO2theexperimentalprocedure，chemicalcontent，lIntr0ductiOnmorphologyanalysis．ormicrostructura1characterizatio
7、n．SEOeta1『81indicatedthatasignificantimprovementonCeriumoxide(CeO2)，asoneofthemostpowerfulmicrostructuralevolutionandmechanicalpropertiesofandfascinatingrareearthoxides，hasbeenwidelyNi-PcoatingsareassociatedwithprecipitatedNi3Pappliedtocatalystsystems，solidstateelectrolyt
