TIN涂层影响牙科合金耐蚀性能的基础研究

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1、上海交通大学硕士学位论文TiN涂层影响牙科合金耐蚀性能的基础研究姓名：陈洁申请学位级别：硕士专业：口腔临床医学指导教师：胡滨20080501上海交通大学硕士学位论文摘要结论：1．本课题运用物理气相沉积技术建立在Ni-Cr合金、Co-Cr合金表面进行TiN涂层的方法，TiN涂层色泽金黄，表面光洁，无起皮、鼓泡。2．TiN涂层后试件的自腐蚀电位升高，合金不易被腐蚀；自腐蚀电流密度降低，腐蚀速度降低；钝化区间变长，破钝电位变大，腐蚀起始减慢；阴极极化曲线低平，析氢现象减弱；阳极极化曲线平坦，维钝电流降低，合金不易被腐蚀。因此，TiN涂层可提高Ni-Cr合金、Co-Cr合

2、金耐蚀性能。3．TiN涂层后试件几乎无滞后面积，因此，TiN涂层可提高Ni-Cr合金、Co-Cr合金耐点蚀性能。关键词氮化钛涂层，物理气相沉积，镍铬合金，钴铬合金，极化曲线，耐蚀性能II上海交通大学硕士学位论文ABSTRACTSTUDYONCORROSIONRESISTANCEOFDENTALALLOYSBEFOREANDAFTERCOATINGTINABSTRACTPurpose:Thisstudywastoestablishphysicalvapordepositiontocoattitaniumnitride(TiN)onthesurfacesoftheNi

3、-CralloyandtheCo-Cralloy,analysethepolarizationcurvesofthesealloysbeforeandaftercoatingTiN,investigatetheeffectofTiNcoatingoncorrosionresistanceofdentalalloys,andtoprovideexperimentaldatafortheclinicalapplicationofdentalmaterials.MaterialsandMethods:Twocommonlyuseddentalcastingalloys,

4、theNi-CralloyforporcelaincrownsandthesoftCo-Cralloyformetalcrowns,werepresentedforthisstudy.Thespecimensofeachalloywereselectedrandomlyandcoatedwithathicknessof2.5µmTiNonthesurfacesbyphysicalvapordeposition.Thepolarizationcurvesofeachspecimenwereanalysedbyelectrochemicalexperiment.III

5、上海交通大学硕士学位论文ABSTRACTResults:1.FromtheTafelpolarizationcurves,thespecimensaftercoatingTiNgainedhighernaturalcorrosionpotentials,lowernaturalcorrosioncurrentdensities,andhigherrupturepotentialsthanthespecimensbeforecoatingTiN.2.FromtheTafelpolarizationcurves,thespecimensaftercoatingTiNs

6、howedthatbothanodicpolarizationcurvesandcathodalpolarizationcurveswereflat,naturalcorrosionpotentialsmovedtothepositiveway,passivationintervalsgotlonger.3.Fromtheannularanodicpolarizationcurves,thespecimensaftercoatingTiNhadalmostnodelay-area.Conclusions:1.Thisstudywasdesignedtodeposi

7、tTiNcoatingonthesurfacesoftheNi-CralloyandtheCo-Cralloybyphysicalvapordeposition.TiNcoatingsweregoldenandslippery.Therewasnogofferandvesicle.2.Highnaturalcorrosionpotentialmeantthatthealloywasdifficulttogetcorrosion.Lownaturalcorrosioncurrentdensitymeantlowcorrosionrate.Longpassivatio

8、ninte