超声辅助激光表面熔凝处理 Mg97Zn1Y2 合金耐腐蚀性研究
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中图分类号：TG178 文献标识码：A DOI：10.7535/hbkd.2025yx06009
Abstract： In order to address the problem：of poor surface corrosion resistance of Mg97Zn1Y2 alloy，a laser surface modification methodthathademerged inrecentyearswasadopted，andultrasonicasistance wasappliedonthebasisof laser surfacemodificationtreatment.Theefectsand mechanismsofultrasonic-assistedlasersurfacemelting（LSM）onthesurface corrosion resistance of Mg-Zn-Y alloy were studied by observing the surface microstructure，elemental distribution，and corrosion behaviorof sampleswithandwithout ultrasonic asistance.Theresults show that，although electrochemical test result indicatesthatultrasonicasistance during LSMdoes notsignificantlyimprovethesample'scorosionresistancedueto surfaceroughnessefects，theimmersioncorosiontestreveals that when thecorosion timeexceds8hours，thecorrosion ratesof the S160-15，S160-20，andS160-25groupsamples are apparentlylowerthanthatoftheS160-0group；The thickneses of the moltenlayers inultrasonic-asisted laser-meltedsamplesarepositivelycorelated withultrasonicamplitude，andallof themarehigherthan thoseof theexperimental samples without ultrasonic-asisted laser melting；Electron backscatter difractionanalysisoftheS16o-2Ogroupsamples（withthebestcorrosionresistance）showsadelaminationphenomenoninthe molten layer，with 24.bμm forthe upper layer and 59.3μm forthe underlying layer. The corrosion behavior of the upper moltenlayerinthe S16o-2O groupsamplesisconsistent with thatinthe S16O-Ogroupsamples.However，grainrefinement occurs in the lower molten layerof the S16o-2O group samples，andthe galvaniccorosionrate formed by these refined grains andlong-period stacked ordered（LPSO）phases is lower than that formed bythe matrix grains andLPSO phases.Thus，the increased thicknessof themoltenlayerinducedbyultrasonicasistanceis moreconducivetoimproving thelong-termcorrosion resistance of Mg-Zn-Y alloy.
KeyWords：non-ferrousmetals andtheirallys；magnesium alloy；laser modification；ultrasonic assistance; corrosion resistance
随着工业的快速发展，材料结构的轻量化、高质量和高强度等性能是航空航天、武器装备和轨道交通等领域所需的发展方向。（剩余13360字）
