钢板熔盐电镀alco合金的研究

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1、摘要本文研究了在熔盐中电镀铝钴合金的工艺。运用扫描电镜、x射线衍射仪、阳极极化曲线及显微硬度仪等检测手段，系统地研究了在Q235钢基体上电镀铝钴合金所用的熔盐配方、工艺参数对镀层厚度、表面形貌、相组成、耐蚀性及硬度的影响；用循环伏安法研究了铝钴合金在钢及铜电极上的沉积机理；并研究了添加剂NdCl3及CeCl3的加入对镀层组织、性能及沉积机理的影响。实验结果表明：在AICl3-NaCI．KCI．CoCl2熔盐体系中能够电镀得到均匀、致密的铝钴合金镀层；熔盐组成、电镀时间、电镀温度及阴极电流密度等工艺参数均对所得镀层的性能有影响；CoCh的加入可以改善镀层

2、微观形貌，促进铝钴金属间化合物的形成；提高了镀层耐蚀性，硬度也比纯铝提高了近1／4；铝钴合金在钢和铜电极上分别为三步沉积和两步沉积。添加剂NdCl3及CeCl3的加入可以改善镀层质量，促进合金相的生成；进一步提高了镀层的耐蚀性，使硬度分别从124MPa提高到139MPa和152M'Pa；加入NdCl3后，镀层在钢及铜电极上的沉积过程变为三步沉积和一步沉积，加入CeCh后，镀层在两种电极上都是两步沉积。关键词熔盐电镀；铝钴合金；耐蚀性；循环伏安；稀土添加剂燕山大学丁学硕士学位论文AbstractThetechnologyofelectroplatingA

3、I-Coalloyinmoltensaltwagresearchedinthispaper．T11eelectroplatingA1·Coalloyprescriptionofsaltbath,theinfluenceoftechniqueparametersonthethicknessofplatinglayer,surfacemorphology,phasecomposition,corrosionresistanceaswellashardnessinmoltensaltonQ235steelhasbeensystematicallystudie

4、dusingscanningelectronicmicroscope，X-raydiffractmeter,anodicpolarizationcurveandmicrohardnesstester；themechanismofdepositionprocessofAI—CoalloyonsteelandcopperelectrodewasresearchedbyCyclicVoltammetrycurves；theinfluenceofadditivesofNdandCechloridetOthecomposition，performanceandm

5、echanismofdepositionprocesswereinvestigatedalso．TheexperimentresultshaveshownthatAI·CoalloyCandepositfromAICl3-NaCl··KCI—COCl2moltensaltsystem；technologyparameterssuchassaltbath,durationelectroplatingtime，electroplatingtemperature，cathodecurrentdensitycouldeffecttheperformanceof

6、alloy·coming；theadditionofCochloridecouldimprovethesurfacemorphologyofalloy—coating，improvetheformationofal-cointermetallics；enhancethecorrosionresistance，thehardnessofalloy-coatingwasenhanced1／4ashighasthepureal；theprocessofal-coalloydepositonsteelandcopperbasewerethree·-stepan

7、dtwo··steprespectively．ThequalityofA1-CoalloyscoatingWasimproved、ⅣitlltheadditivesofNdandCechloride，promotetheformationofalloyphase；thecorrosionresistanceofcoatingWasenhancedfurther,andtoincreasethehardnessofthecomingfrom124MPato139MPaand152MParespectively．Afteraddingndchloride，

8、theprocessofcoatingdepositiononsteelandcopperwe