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1、螺丝的表面处理（Surfacetreatmentofscrews）Surfacetreatmentandbondingofgluedmaterial(1)theinfluenceofsurfacecharacteristics1,cleanliness:metalsurfaceadsorptionofalayerofcohesivestrengthoflowsurface,lowpollutionlayerandoxidefilm,whichwillreducethebondingstrength.Generally,whenthemetalsurfaceisclean,thecon
2、tactissmallorevenzero.Whenthematerialistreated,thecontactchangeswithtime,anditiseasytobepollutedbyatmosphereintheair.Thecontactangleincreases,andthecontactanglebecomesstableafterabout5H.ContactangleandbondingstrengthbeforeandaftersurfacetreatmentMetalhandlingmethod,contactangle(degree),shearstr
3、ength,MpaAluminum,untreated,skim,H2SO4/Na2Cr2O7,H2SO4/Na2Cr2O7+,hightemperaturebake676707817.2,19.3,36.3,25.5Stainlesssteel,untreated,degreasing,H2SO4/Na2Cr2O750-756710,36.6,44.3,49.7TitaniumwastreatedwithoutdegreasingH2SO4/Na2Cr2O750-75,61-7110,9.5,22.4,43.22,roughness:thesurfaceofthegluedmate
4、rialispolishedorsandblastedbygauze,androugheningofthesurfaceproperlycanimprovethebondingstrength.Rougheningremovesthepreexistingsurfacelayer.Theformationofnewsurfacelayer(purification),andsurfacepolishingsurfacethanactualbondingareaislarger,thesurfaceistooroughbutwillreducethebondingstrength,be
5、causethesurfaceistooroughtobenotgoodadhesiveinfiltration,concavesurfaceoftheadhesiveresidueleftairnegative.Adhesiveweightratio,curingcondition(oC/H)UpaSandblastingpolishingEpoxypolyamide70/3074/1658.327.860/4074/1657.734.650/50/74/165938.2Epoxy-DTA100/1060/968561.93,surfacechemicalstructure,che
6、micalcompositionandstructureonthesurfaceofthegroundishaveanimportantimpactonperformance,bondingmaterials,adhesivedurability,heatagingresistance,andtheeffectofsurfacestructureonadhesiveperformanceisoftenbychangingthesurfacelayerofthecohesivestrength,thickness,porosity,andsurfaceactivitycanbeachi
7、eved.Chromicacidetchingaluminumsurface,thealuminumsamplesweresoakedin60oCdistilledwatercleaning,easilyonthesurfaceofaluminahydrateformationisdominatedbyAL2O3.3H2O,thecohesivestrengthislow,thethicknessof>103A,thejointdamageintensit
