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1、电镀光亮镍钛合金工艺的研究摘要:本文介绍了一种在含有主、辅配位剂的水溶液中电镀光亮NiTi合金的工艺。运用HullCell,小槽电镀,电化学测试,以及扫描电子显微镜和X-射线衍射等方法,研究了Ni2+、Ti2+在溶液中的电沉积时的行为和合金沉积层的结构。结果表明,在含有特殊的配位剂的水溶液中,Ti借助于Ni的“诱导”作用,可以以合金的形式在阴极上电沉积出来;所得的NiTi合金层光亮,均匀,含Ti在10%~35%之间,其为层状的均匀的晶态结构。而且,合金层中的含Ti量与溶液中Ti盐的浓度成正比,与阴极电流密度成反
2、比。在5%NaCl溶液中的实验还表明,NiTi合金层比Ni层耐蚀能力高于40%。其可作为Ni,Cr或Ni+Cr的替代镀层。此外,研究的镀液使用的pH、温度、电流密度范围宽;阴极电流效率在50%~70%,且随pH、温度的上升而增加,随电流密度的上升而下降。推荐的电镀光亮Ni-Ti合金溶液组成及操作条件是:NiSO4.6H2O,50~60g/L,NiCl2.6H2O0~15g/L,Ti盐液50~125ml/L,H3BO335~40g/L,Na3C6H5O7˙2H2O50~60g/L,JC-An10~15g/L,光亮
3、剂2~4ml/L,辅助剂8~10ml/L,pH:3.5~5,温度:40~60℃,阴极电流密度:1.0~5.0A•dm-2,阳极:镍板,或不锈钢板,或钌钛合金阳极.关键词:电镀;电镀镍钛合金;配位剂;光亮剂;电化学行为测试ResearchonBrightNickel-TitaniumAlloyElectroplatingProcessHUZhe1,ZUOZhengzhong2*,YANGJuan1,LIYuliang1,SONGWenchao1(1,WuhanJadechemChemicals(J&C)Co.Lt
4、d.,Wuhan,Hubei430023,2,CollegeofChem.&Molecularsiences,WuhanUniv.,Wuhan,Hubei430072,)Abstract:ThispaperintroducedanovelprocessforNickel-Titaniumalloyelectroplating,whichwascarriedinaqueoussolutioncontainingbothmajor/auxiliarycomplexingagent.Hullcell,smallcel
5、l,electrochemistrytest,ScanningElectronMicroscopy(SEM)andX-rayDiffraction(XRD)etc.methodswereconducted,toinvestigatetheelectro-depositionbehaviorsofNi2+、Ti2+insolution9andthestructureofalloydeposits.TheresultsindicatedthatTicanbeelectro-depositedoncathodeint
6、heformofNi-Tialloysinspecialcomplexingagentscontainingaqueoussolution,withtheaidof“inductioneffects”byNi;theresultingNi-Tialloylayerwasbright,smooth,with10%~35%ofTiinmass,displayinghomogenouslaminatedcrystalstructure.ThepercentageofTiinalloyplatinglayerwaspr
7、oportionaltotheconcentrationofTi-salt,andwasinverselyproportionaltocurrentdensityincathode.Experimentsin5%NaClsolutionsuggestedthatNi-Tialloyplatinglayerwas40%moreresistanttocorrosionthanNi-layer,soitcanbeusedtoreplaceNiorCrorNi/Crdoubleplatinglayer.Furtherm
8、ore,theplatingsolutionhadawiderrangeinpH,temperatureandcurrentdensity;cathodecurrentefficiencywasin50%~70%,increasingwiththerisingofpHvalueandtemperature,decreasingwithincrementofcurrentdensity.