固相鎳在液相鋅中的反應(yīng)及溶解行為研究.pdf

1、分類號UDCTGl744學(xué)校代碼密級y78693110561學(xué)號200236000201109華南理工大學(xué)碩士學(xué)位論文固相鎳在液相鋅中的反應(yīng)及溶解行為研究孟慶昌指導(dǎo)教師：莊盟堂熬援撾越型堂皇王程堂瞳申請學(xué)位級別：亟土專業(yè)名稱：撾料加』王程論文提交目學(xué)位授予單位和口期：垡直堡王太堂答辯委員會主席：鰱絲蕉巡論文評閱人一一蘭童堡二查堂堡圭蘭竺笙蘭——AbstractTechnigalvaisaneffectivemethodtosolveth

2、eproblemsofgalvanizingofreactivesteelsZnNialloythekeyalloymaterialoftechnigalvatechnique，isusedwidelyinhotdipgalvanazingInthispaper，someproblemsaboutZn。Nialloyarestudied，includingtakingNidirectlyintoZnbath，toimitatepract

3、icalgalvanizingprocess，tespondtheZn。NialloyintermetallicmicrostructureandthegrowthoftheintermetallicphaselayersMathematicsmodelaboutZnNialloylayersgrowthkineticswasestablishedtoanalysealloylayersgrowthkinetics；masstransf

4、erequationanddissolutionvelocityequationwasestablishedtoconfirmthedissolutionvelocitycontrolprocessTheobservationontheintermatellicphaselayermicrostructureofsolidnickelinliquidzincatdifferenttemperature，showsthatYphasean

5、d6phaseareformedonthesolidnickelimmersedinliquidzincat450“C，whiletwodifferentTphasewillbeformedat550℃and650℃∥’phasewasnotfoundduringthewholeprocessMathematicsmodelaboutZnNialloylayersgrowthkineticswasestablished，anditded

6、ucethatalloylayersgrowthandtimeaccordwithpowerrelationshipthatisx—Kt4Findthatat450℃～650℃，ZnNialloylayersgrowthallaccordwiththisrulephase連iscontrolledbydiffusionmechanism，thegrowthofphaseYisslow；at550。C、650。C，thegrowthofp

7、haseYisfaster，controlledbydiffusionandinterfacereactionAt450“C～6504C，diametervarietyexperimentofNidippingintoZnshowsthatthedissolutionvelocityofsolidNiinliquidZnbecomefasterandfaster，andthenbecomeslowgraduallywiththetemp

8、eraturerising，dissolutionvelocitybecomesmoreandmorefastSOinpracticalproductionprocess，enhancingtemperaturecanquickenthedissolutionvelocityBesides，solidNiincalmliquidZn，naturalvectionwilloccur，withtemperaturerising，itbeco

9、mestrongerMasstransferequationanddissolutionvelocityequationwasestablished，dissolutioncontrolstepofNidippingintoZnwasconfimed，findthatat450。C，thedissolutionprocesswasgovernedbyamixedcontrolmechasiminvolvingdiffusioninliq

10、uidzincandchemicalreactionoftheintermetalliccompoundlayersAt550。Cand650。C，therateseemstobecontrolledbydiffusionacrossaconcentrationboundarylayerinliquidzincDuringgalvanizingprocess，enhancingmeltingtemperatureandincreasin