znal伪合金涂层的制备及耐海洋腐蚀性能研究

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1、PreparationofZn-AIPseudoAlloyCoatingsandTheirCorrosionResistanceinMarineEnvironmentLiChunling(MaterialsScienceandEngineering)DirectedbyAssociateProf．LuYuxiangAbstractZn·AIcoatingsarereplacingthetraditionalpureZnandA1coatingsinthefieldoflonglifeanti-corrosionforlargesteelconst

2、ructions．Therefore，itisveryimportanttostudythepreparationandcorrosionresistanceofZn—AIcoatingstocreatehighperformancecoatings．Inthispaper，arcsprayingtechnologywasusedtoprepareZn—A1pseudoalloycoatingswithdifferentcontentsofAI．TheparameterswereoptimizedthroughtheBPartificialneu

3、ralnetworktechnique．Themicrostructuresofcoatingswerecharacterizedbyopticalmicroscopy,scanningelectronmicroscopy,energyspectrumanalysisandX-raydiffraction．Thecoupontestswereconductedtoevaluatethecorrosionresistanceofcoatingsinthreek．indsofsimulatedmarineenvironments，includingn

4、eutralsalt—spraytest，splashtestandimmersiontest．Atthesametime，thecorrosionmechanismsofcoatingsindifferentenvironmentswerediscussed．TheresearchresultsshowedthatmodelpredictionsobtainedthroughtheBPartificialneuralnetworktechniqueandexperimentaldataagreedreasonablywell，whichindi

5、catedthemodelWasreliableandavailable．ThreekindsofZn—AIpseudoalloycoatingswithdifferentcontentsofA1andZn·15A1alloycoatingwerepreparedundertheoptimumparameters．Theappearancesandmicrostructuresofcoatingswereobserved，whichshowedthatthequalityofcoatingssatisfiedrelevantnationalsta

6、ndard．ThecoatingsurfacesofZn-14AIandZn一46A1wererougherthanthoseofZn-15AIandZn一27A1．TheresultsofXRDshowedthatallthepseudoalloycoatingswerecomposedoftheZnphaseandtheA1phase．TheresultsofEDSshowedthattherewereZnenrichmentzonesandAIenrichmentzonesintheZn-AIpseudoalloycoatings，howe

7、ver，thechemicalcompositionWasuniformintheZn一15A1coating．Theresultsoftheelectrochemicalmeasurementsshowedthattheopen·circuitpotentialofthesecoatingsshiftedpositivelywithincreasingthecontentofAIinthesolutionof3．5llwt％NaCI．However,theopen—circuitpotentialsofthesecoatingsdidnotdi

8、ffermuch．Inaddition，passivationwasobservedfromthepolarizationcurveso