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1、上海大学硕士学位论文ABSTRACTPartOneAnticorrosionMechanismofZn-MgAlloyCoatingonSteelSheasandFeasibilityStudyofElectroplatingZn-MgAlloyCoatinginAqueousSolutionInmodemsociety,steelsheetshavebeenwidelyusedinautomobiles，householddectdcappliances，architecturesandSOOILButconventio

2、nalsteelsheetstendtobecomerustyundernormaluse．Toavoidthisproblem，platedsteelsheetsarefindingwidespreaduse．Typically,Znplatedsteelsheetsaregenerallyemployedascorrosionresistancemefll娼forasteelsheet．Withthedevelopmentofscienceandtechnology,ademandforimprovingcorrosi

3、onresistanceofsteelsheetshasincreasinglybeenontheupwardmove．Therefore,variousZn-basedalloycoatingsuchasZn-Ni，Zn-Co，Zn-Fe,Zn-Cr,Zn-Sn,Zn-A1-Si，Zn-A1-Mg,Zn-A1-Snetc．havebeendevelopedandusedtocopewiththedemandforenhancementofanti-restperformanceofsteelsheets．Nowadays

4、Zn-Mgalloycoatinghasbeenidentifiedasaverypromisingcoatingsystembecauseofit'soutstandingcorrosionresistanceMgisakindofactivemetalandit’Snormalelectrodepotentialis-2．37v．Generallyspeaking,itisnotakindofmOalthathasexcellentanticorrosionability．However,alotofresearchw

5、orksreportedinliteratureshaveshowedthatZn-MgaUoycoatinghasanexcellentanticorrosionp,矾ormance．Inourstudy,X-raydiffractionanalysis唧)，Scanningelectronmicroscopy(SEM)andElectrochemicalmethodswereemployedtoanalysistheZn-Mgalloycoatingonsteelsheetsanditscorrosionproduct

6、s，comparedwithconventionalgalvanizedsteelsheets．TheZn-MgalloycoatingswereproducedbydepositingthePVD(physicalvapordeposition)coatingonalreadyelectrogalvalisedsteelsheets．TheformationofMgT_a2isthemainreasonofsohighanticorrosionperfommce,andtheanalysisresultsofcorros

7、ionproductsofZn-Mgalloycoatingandconventionalzinccoatingshows,compactandinsulativesirnonkolleiteZnCh‘4Z,n(OI-t)2’H20andstablezincVII上海大学硕上学位论文carbonatesZn4C03(OI-I)6·H20arcthedominantcorrosionproductsofZn-Mgalloycoating，andamorphousZnOthathassemi-conductingnaturei

8、sthedominantcorrosionproductofconventionalgalvanizedsteelsheets．WealsocanobtaintheresultfromXRDthatZn-MgaU0ycoatingconsistesofintdmctallicphasesMgZn2and