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两种AZ镁合金表面钼酸盐转化膜的研究 Title:AStudyofTwoTypesofMolybdateConversionCoatingsonAZMagnesiumAlloys'Surfaces Introduction: AZmagnesiumalloysarewidelyusedinvariousindustriesduetotheirlowdensity,highspecificstrength,andexcellentcastability.However,theirpoorcorrosionresistancelimitstheirapplications.Surfacetreatments,suchasconversioncoatings,arecommonlyusedtoimprovethecorrosionresistanceofmagnesiumalloys.Amongvariousconversioncoatings,molybdateconversioncoatingshaveshownpromisingresults.ThisstudyaimstoinvestigateandcomparetheperformanceoftwotypesofmolybdateconversioncoatingsonthesurfaceofAZmagnesiumalloys. Methodology: 1.SamplePreparation: -AZmagnesiumalloyspecimensarecleanedusingacetone,followedbyrinsingwithdistilledwater. -Thesamplesarethendriedandweighedtoensureconsistentmass. 2.MolybdateConversionCoatingPreparation: -Twotypesofmolybdateconversioncoatingsareprepared. -Type1:MolybdatesolutionAispreparedbydissolvingsodiummolybdateindistilledwater.Type1coatingisobtainedbyimmersingthecleanedAZalloysamplesinmolybdatesolutionAforaspecifiedduration. -Type2:MolybdatesolutionBispreparedbyaddingacomplexingagenttosodiummolybdatesolutionA.Type2coatingisobtainedbyrepeatingtheimmersionprocessofAZalloysamplesinmolybdatesolutionB. 3.CoatingCharacterization: -Thecoatedsamplesarevisuallyinspectedforcolor,morphology,anduniformity. -Thesurfacemorphologyisexaminedusingscanningelectronmicroscopy(SEM)andatomicforcemicroscopy(AFM). -X-raydiffraction(XRD)analysisisperformedtoidentifythecrystallinestructuresofthecoatings. -Electrochemicalimpedancespectroscopy(EIS)isconductedtoevaluatethecorrosionresistanceofthecoatedsamplesinacorrosiveenvironment. ResultsandDiscussion: 1.VisualInspection: -Type1coatingexhibitsauniformappearancewithalightyellowcolor,whileType2coatingappearsslightlydarkerwithsomevariationsincolorintensity. 2.SurfaceMorphologyAnalysis: -SEMandAFManalysisrevealthatbothcoatingsformadenseanduniformlayeronthesurfaceofAZmagnesiumalloys. -Type2coatingshowsasmoothersurfacecomparedtoType1coating