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时间:2020-06-03
《稀土镁合金微细电火花加工变质层微观结构及性能研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第49卷第2期金属学坂、,o1.49NO.22013年2月第251—256页ACTAMETALLURGICASINICAFeb.2013PP.251——256稀土镁合金微细电火花加工变质层微观结构及性能研究术孙术发,。)狄士春)吕鹏翔)韦东波)喻杰)郭豫鹏)1)哈尔滨工业大学机电工程学院,哈尔滨1500012)东北林业大学工程技术学院,哈尔滨150040摘要利用微细电火花不同工艺加工了稀土镁合金.采用SEM和XPS分析了加工后稀土镁合金表面变质层形貌和成分,采用纳米压痕仪分析了变质层的硬度,采用动电位极化曲线评价了变质层的耐腐蚀性能.结果表
2、明,变质层表面有微裂纹,降低加工电压和电流可以减少微裂纹,增大脉宽和脉间可以有效消除微裂纹;在3种不同介质中加工得到的变质层表面均发生了氧化反应,在去离子水中加工的变质层表面还发生了显著的电化学腐蚀;变质层的硬度高于稀土镁合金基体,其最高硬度可达到1.664GPa;动电位极化曲线表明,变质层可以改善稀土镁合金的耐腐蚀性能.关键词稀土镁合金,微细电火花,变质层,硬度,腐蚀中图法分类号TQ174文献标识码A文章编号0412—1961(2013)02—0251—06MICR0STRUCTUREANDPR0PERTIESoFMETAM0R—PHIC
3、LAYERF0RMED0NMg-REALL0YINMICRo—EDMPRoCESSsUNshu1,u,1),wEIu,u1).faDIShichunLUPengxiangDongboYUJieGU0Yupen91)SchoolofMechatronicsEngineering,HarbinInstituteofTechnology,Harbin1500012)InstituteofEngineeringandTechnology~NortheastForestryUniversity,Harbin150040Correspondent:SU
4、NShufa.Teh(0451)82191248,E-mail:ssf6868~yahoo.corn.cnSupportedbyHighTechnologyResearchandDevelopmentProgramofChinaNo.2009AA044205)Manuscriptreceived2012-09-21,inrevisedform2012-10-20ABSTRACTInthiswork,theMREalloymetamorphiclayerwasformedinthemicro-EDMprocessindifierentproc
5、essparameters.ThemorphologyandcompositionofthemetamorphiclayerweredetectedbySEMandXPS.thehardnessofthemetamorphiclayerwasmeasuredbyananoinden—tor,thecorrosionresistancepropertywasinvestigatedbyusingapotentiodynamicpolarizationtest.Theresultsshowthattherearemicrocracksonthe
6、surfaceofmetamorphiclayer.themicrocrackscanbereducedbydecreasingprocessingvoltageandcurrent.anditcanbefurthereliminatedbyincreas—ingpulsewideandpulseinterva1.Theoxidationcausedonthesurfaceofmetamorphiclayersinthemicro-EDMprocessinthreedifierentdielectricsamongwhichtherewas
7、significantlyelectrochemicalcorrosiononthesurfaceindeionizedwater.ThehardnessofmetamorphiclayeriSenhancedcomparedtothesubstrateofMgREalloy,anditsmaximumvalueiSabout1.664GPa.ThepotentiodynamicpolarizationtestshowsthatthecorrosionresistanceoftheMg—REalloywasimprovedsignifica
8、ntlyduetotheexistenceofthemetamorphiclayer.KEYWoRDSMREalloy,micro—EDM,metamorphiclayer,ha
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