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1、西北工业大学硕士学位论文ABSTRACTAbstractNdFeBalloy,thethirderapermanentmagnet,iswidelyusedinelectromotorindustryandapparatusindustry,etc.Ithastheadvantageofdistinguishedmagneticproperties,beingmachinedeasilyandcomparativelylowprice.Butitispronetobeoxidatedincommonatmosphere,especiallybeheavilyele
2、ctrochemicalerodedathumidityenvironment.CorrosionbecomestheobstructiontobroadenapplicationsofNdFeBInthisthesis,anti-corrosiontechnologyofNdFeBwasinvestigated.BasedonthethoroughcomprehensionofthecharacterofsinteredNdFeBalloy,surfacetreatmenttechnologywasadoptedtoprotectitagainstcorrosi
3、on,includingelecrolessnickelplatingandlaserprecipitatedsolidification.Byceaselessaimedexperiments,theparametersofelecrolessnickelplatingwereoptimized,whichledtonon-crystalNi-PcoatingonNdFeBbeingobtained.Furthermore,theefectofheattreatmentofnon-crystalNi-PcoatingwasstudiedWiththeincrea
4、seofheattemperature,thenon-crystalNi-Pcoatingbegantocrystal,anditwillentirelytransformintomicrocrystalcoatingatapropertemperatureFinally,highqualityanti-corrosionNi-PcoatingwasobtainedonNdFeB'ssurface,whoseaveragegrainsizewasat10-9maswell.What'smore,particularlaserprecipitatedsolidifi
5、cationprocessingwasappliedtoquickmeltNdFeBathighheatrate.Accordingtorapidone-dimensionconductofheatbymatrix,themeltedsurfaceofNdFeBquenchtoadirectionalsolidificationcystiformstructure.Soananti-corrosioncoatingcorrelatedwithmatrixtightlywasmadeonNdFeBinsuchaway.Therelationshipbetweenpa
6、rametersoflaserandthemicrostructureoflaserprecipitatedsolidificationcoatingwasdiscussedeither.ComparedbetweenNi-Pcoatingandcoatingoflaserprecipitatedsolidificationbycorrosiontests,theresultsshowNi-Pcoatinghasexcellentcorrosionresistancesthanthelaterinvariousaspects.Thekeyreasoncausing
7、thediferencebetweenthosetwocoatingissomemicrocrevicesoccurredonNdFeBwhenutilizinglasersurfacetreatment.Inshort,elecrolessnickelplatingisthebeterchoicetopreventNdFeBfromcorrosion.Keywords:NdFeBalloyElecrolessnickelplatingLaserprecipitatedsolidificationDirectionalsolidificationMicrocrys
8、talCo
