NdFeB磁性材料化學鍍Ni-Cu-P及其耐腐蝕性能研究.pdf

1、寧夏大學碩士學位論文NdFeB磁性材料化學鍍NiCuP及其耐腐蝕性能研究姓名：王憨鷹申請學位級別：碩士專業(yè)：凝聚態(tài)物理指導教師：陳煥銘劉紅飛20080501AbstractInthispaperNiCuPternaryalloycorrosionproofcoatingsplatedonthesurfaceofNdFeBpermanentmagnetwasfabricateddirectlybyelectrolessplatingmet

2、hodSixternaryNi—CuPcoatings謝mdifferentCuandPcontentWCl“eobtainedbysixdifferentelectrolessNiCuPplatingbathThemorphologyofcoatingsanditscompositionwereobservedandanalyzedusingscanningelectronmicroscope(SEM)andenergydispers

3、edspectrum(EDS)attachedontheSEMThecrystals仇lctureofNiCuPcoatingswithdifferentCuandPcontentandtherelationshipbetweentheamorphousstructureofNiCuPcoatingsandtheheattreatmenttemperature((200“C、300℃、350℃、380“12、400℃、500℃)Were

4、analyzedbyusingXraydiffraction(XRD)necorrosionpotentialandcorrosioncurrentdensityofNiCuPcoatingsweredeterminedbyelectropolarizationgurve，anditsweightlossexperimentinHN03solutionsWasalsoconductedforthecorrosionperformance

5、testFurthermore，basedontheinvestigationofdeposi婦gprocess稍Ⅱldifferenttimeseries(20s、lmin、2min、3rain、5min、7rain、10rain、20rain、40rain、60rain)thedepositionmodelofNiCu—PamorphouscoatingsduringnucleationandgrowthWasputforwardT

6、hechemicalreactionmechanismofdepositsformationwasalsoanalyzedabstractlyTheobservationandanalysisofthecoatingsmicroscopyindicatedthatthesamplesmorphologyappearedcloselynodulesstrIlctl肛’eandtheNi、Cu、Pelementsdistributedint

7、hecoatingshomogeneouslyTheXraydiffractionanalysisandthehardnessmeasurementsuggestedthatwiththechangesofCuandPcontentthecoatingss觚lcmreswerecrystalline、mixedcrystalline、andamorphousrespectivelyAndthecoatingshardnessalsoin

8、creasedwhileitsstructurechangedfromamorphousintomixedcrystallineorfrommixedcrystallineintocrystallineTheinvestigationofheattreatmentfortheamorphouscoatingsshowedthatthetransformationtemperaturewasabout350℃to380℃neresults

9、ofweightlossexperimentinHN03solutionsandelectropolarizationcurvemeasurementsindicatedthattheanticorrosionpropertyofNiCuPcoatingsincreased、ⅣimthePcontentincreasingAmongthesixcoatingspreparedbyeletrolessplating，theamorphou

10、scoatingspossessedthebestanticorrosionpropertyinwhichthePcontentreachedabout12％，andthecrystallinecoatingshadaloweranticorrosionpropertyinwhichthePcontentreached17％scarcelyTheinvestigationonmorphologyands伽lct眥eoftheamorph

11、ousalloycoatingspreparedwithdifferenttimeseriessuggestedthatintheearlystages，NiandCuatomclustersdepositedonthosesurfacesitesatwhichhavinghigherenergypreferentiallythenthenucleiwcreformedandgrownupalongthematrixsu_rtacewi

12、thirregularshape，asaresults，thecrystallinecoatingsformedandcoveredallthematrixsurfaceDuringthelateststages，coatingsmorphologychangedfromirregularshapeintegularnodulesshapegraduallywiththePcontentincreasing，resultingintot

13、hemirrorlikeamorphousalloycoatingsformedTheformationmechanismofamorphouscoatingspreparedbyelectrolessplatingcouldbeseemedascontiIluoustransitionofs饑lctllrechangingfromcrystallinetomixedcrystallineandthenamorphousKeywords