英文翻译论文模板.docx

英文翻译论文模板.docx

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英文翻译论文模板

本科生毕业设计专业外文翻译

原文：

Magnesiumalloyelectricwheelhub

micro-arcoxidationproductionresearch

译文：

镁合金电动车轮毂微弧氧化生产研究

指导教师：

张清郁职称：

讲师

学生姓名：

陈孟丽学号：

1002130301

专业：

机械设计制造及其自动化

院（系）：

机电工程学院

2015年4月10日

Magnesiumalloyelectricwheelhubmicro-arcoxidationproductionresearch

Mostelectricvehiclesathomeandabroadisconfiguredtoaluminumalloywheelhub,itsquality,energysaving,shockabsorption,noisereductionandvehicledynamicscharacteristicsindexismuchlowerthanmagnesiumalloys.Magnesiumalloyis30%lighterthanaluminumalloy,thedampingeffectis30timesthatofaluminumalloy.Replacethealuminumalloywithmagnesiumalloywheelhub,drivingthedevelopmentofmagnesiumalloymaterialdevelopmentanddeepprocessingtechnology,toreduceelectricvehicleweightandpowerconsumption,energyconservationandenvironmentalprotection;Toreducevibrationandnoise;Improveridecomfortandelectricvehicledynamiccharacteristicssuchasobjective（transportationqualityeachreduce10%,energyconsumptionwillbereduced8%~10%）.Butitscorrosionresistanceispoor,seriouslylimitstheapplication.Commonlyusedchemicaloxidationandanodeoxidationformationofoxidefilmonmagnesiumalloyhascertainprotectiveeffect,butitscorrosionresistance,environmentalfriendliness,appearanceisnotsatisfactory,bebadlyinneedofthedevelopmentofnewsurfacetreatment.Inrecentyears,peopletryingtodevelopavarietyofnewtechnologies,suchasmicroarcoxidationtechnology,thebetter

OneMicro-arcoxidationmechanism

Micro-arcoxidationtechnologyisanewsurfacetreatmenttechnologyofgreenenvironmentalprotection,cangrowinlightmetalsurfaceinsituceramiclayerdirectly.Itstechnologicalcharacteristics,surfacetreatment,aswellastheperformanceofthesincethetechnologywasinventedbythefavourofpeople,itsmechanismistolightmetalssuchasaluminum,magnesium,titaniumanditsalloyputinelectrolyteaqueoussolutionasanode,usingthemethodofelectrochemicalsparkdischargespotsonthesurfaceofthematerial,thethermalchemistry,plasmachemistryandelectrochemistry,underthejointactionofmetaloxideceramiclayersofasurfacemodificationtechnology

Tworesearchmethodsandtechnology

Thistopicintheresearchonmagnesiumalloyelectricwheelhub,higherrequirementsonthetoughnessofthealloy,sochooseAM60B,meltandinitialtemperatureof468℃,themeltingendtemperatureis596℃,theliquidustemperaturerangeof165℃.Thechemicalcompositionasshownintable1.

Table1AM60Balloychemicalcomposition（WB/%）

Al

Zn

Mn

Si

Cu

Ni

Fe

杂质

余量

5.6～6.4

≤0.20

0.26～0.5

≤0.05

≤0.008

≤0.001

≤0.004

0.02

Mg

Becauseofthemagnesiumalloyelectricwheelhubsurfaceareaislarger,generalabove0.4m2,requiremicro-arcoxidationpowersupplyisbigger,thissubjectadoptsthelanzhouuniversityoftechnologyinstituteofmaterialsanddevelopmentofMAO-300typencmicro-arcoxidationproductiondevice（figure1）micro-arcoxidationonmagnesiumalloywheelcastingprocessing,itssimilartoordinaryanodicoxidationequipment,includingspecialhigh-voltagepowersupply,micro-arcoxidationalkalinesolutionofelectrolytictank,mixingsystem,coolingsystem,workpiecewithstainlesssteelplateforpeerelectrode.

Withmicro-arcoxidationmethodinsodiumsilicateandsodiumhydroxideelectrolytefluidsysteminthepreparationofmagnesiumalloywheelcastingoxideceramicmembrane,theconcretetechnologicalprocessfirstsetoxidationprocessparametersandthealkalinetanksodiumsilicatesolution,thecleaningaftermicro-arcoxidationofmagnesiumalloywheelcastingintocell15~20min,cleanwithclearwatertank2~4min,addhotwaterinhotwater（80℃,10~15min）,closed,thencoolinthecoldwatertank2min,hoistedoutdrainage,drying,examinethehub.Aftermicro-arcoxidationtreatmentmustbeclosedbyhotwater,formedbymicro-arcoxidationdischargeholessothedistributionofthechannelandthesurroundingalargenumberofmicrocrackswillbeclosed,preventoxygentocauseoxidation.Aftercompletionofmicro-arcoxidation,fromaftermicro-arcoxidationonmagnesiumalloywheelcastinginterceptfilmsamplewereanalyzed,andtofacilitatetestanalysis,requestsamplesmadeofcircularplate,sothesampleinterceptionlocationchoiceamongwheels,mostisshowninfigure2.Usingscanningelectronmicroscopeanalysisofoxidefilm

Figure1MAO-300typencmicro-arcoxidationpowersupply

Figure2aftermicro-arcoxidationmagnesiumalloywheelhubcastingandinterceptionofmembranelayeranalysissample

Threemicro-arcoxidationprocessparametersonthequalityofthefilm

Basedontheresearchofthesampleandanalysisofmicro-arcoxidationtechnologyis,infact,thesubstratemagnesiummagnesiumoxide.Figure3forthedimensionofsamplesbeforeandafteroxidationappearanceschematicsimulation,whichissuitableforceramicoxidefilmaoutwardgrowth,namelytheincreaseofsizepart,bisthedepthoftheinternaloxidationtothematrix,aandbinterfaceforinitialsamplesurfaceposition,hforthetotalthicknessofoxidefilm.

Figure3samplesdimensionchangesbeforeandaftermicro-arcoxidationdiagram

Largerinfluenceontesthasapositivevoltage,frequency,dutycycle,currentdensityandoxidationtimeontheprocessparameters.Duetotheelectriccastingofmagnesiumalloysurfaceareaislarger,micro-arcoxidationmicro-arcdischargemustbeformedinthesurfacecanoccurafteracertainthicknessofoxidefilm,sotheformationoftheoxidefilmisneededforthevoltagedoesn'tneedmuch,thecurrentislarger,theoxidefilmformationandtheprocessofthickening,oftenaccompaniedbycurrentandvoltagemutation.Whentheoxidefilmthicknessreachesacertaindegree,theneedtoincreasethevoltageonbothendsoftheworkpiece,usuallyataround150Vinthemicroarcdischargebetweentheworkpieceandtheelectrolyte.Increasedwiththeincreaseofvoltage,current,micro-arcdensityismoreandmoreclose,moreandmorebright,andmicro-arcconstantlybeating,basically,thecurrentandvoltage,linearincreaseabout180Vvoltage,thedensityofmicro-arcbasicallymeetthetechnologicalrequirements,thecurrentgrowthslowly.Whenthethicknessofoxidefilmreachesacertainelectricity

Fromelectriccastingmagnesiumalloysisnothardtofindinthemicro-arcoxidationtestresultanalysis,micro-arcoxidationintheprocesscanbedividedintotwosteps,namelytheoxidefilmformationstageandthestageofmicro-arcoxidationfilmdischarge,theformationofoxidefilmphaseastheinitialstage,thestageofthesupplyvoltageissmall,andafterthefilmtoproducemicro-arcdischargerequireshighvoltage,formagnesiumalloyelectriccastingthelargeworkpiecewithmicro-arcoxidationprocessingsurfaceareaislarger,thefilmforalongtime,toalargeextentaffectedtheproductionefficiency.

Experimentalresultsalsofoundthatthedcpowerofoxidefilmfasterthanpulsepower,intheabsenceofmicroarcdischarge,oxidefilmlayerisnotdense,itcanbeseenfromappearance,needagainwithpulsepowersupplyformicro-arcoxidationdischarge,theoxidefilmbecomemoredense.Inordertoimprovetheproductionefficiency,tomeettheneedsofindustrialproduction,suggestearlylowvoltageadjustabledcconstantvoltagepowersupplyareavailabletosetuptheinitialoxidationfilm,formingacompleteinsulationfilminplacetoensurethatthefirstphase,andtheoxidefilminthelatedischargecanusedigitalpulsetypeadjustablepowersupply,itcanshortentheartifactsofmicro-arcoxidationtime.

Thesizeofthecurrentdensityinacertainextentreflectstheintensityofmicro-arcoxidation,stronglyaffecttheresultingperformanceofthemicroarcoxidationceramiclayer.Thedurationofoxidationalsoseriouslyaffectsthecoatingcorrosionresistance:

oxidationtimeistooshort,althoughgeneratedmainlythedenselayer,butthefilmistoothin,don'thavegoodcorrosionresistance;Afteroxidationtimeistoolong,atsometime,withtheincreaseoftime,althoughtheoverallfilmthicknessincreases,buttheincreaseisalooselayer,layerdensityandthinningtrend,doesnotfavorthecoatingcorrosionresistance,alsonoteconomic.Thedensityofmicroarcalsorelatedwiththepulsefrequency,whenthepulsefrequencyincreases,thedensityofmicroarcalsograduallyincreased.Willhavetheelectricfieldsetupsuddenly,canproducemicroarc.Inthebasicprocessparameterssuchaselectrolyteconcentration,dutyratioandpulsenumberofuncertain,thearcvoltageisconstantcommonly,sowhenthefrequencyincreases,thesustainmicro-arcvoltagefrequencyincreases,themicro-arcdensitywillincrease

Fourmicro-arcoxidefilmlayerstructurecharacteristics

Aftermicro-arcoxidationofmagnesiumalloywheelhubinterceptionbyMef3largemetallurgicalmicroscopeobservationofthesample,themicro-arcoxidefilmsurfacemorphologyasshowninfigure4.Canbeseenfromthefigureinthewheelhubsurfacelayerismadeupofmanytiny"smallvolcaniccone"（figureprotuberantpartaroundtheholes）indendriticcombination,constitutethemeshstructure."Smallvolcaniccone"centerhasasmallhole,thisistheelectrolytereactionwithmatrixmicro-arcdischargechannel,namelywhenthemicro-arcspewedmoltenoxidechannel.Inaddition,becausethecurrentmicroarealocalplasmachannelisdifferentthatdifferbythesizeofthehole,bigholearealsodistributedaroundalargenumberofmicrocracks,thegenerationofmicrocracksoftenrelatedtothestressthatex