化学复合镀工艺研究

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1、上海交通大学硕士学位论文化学复合镀工艺研究姓名：黎黎申请学位级别：硕士专业：材料学指导教师：陈秋龙20070201耐磨性能最好，并且热处理后复合镀层硬度提高一倍，镀层的摩擦系数和耐磨性能进一步提高。采用划痕仪表征的Ni-P镀层和Ni-P-SiC复合镀层的膜基结合力表明，复合镀镀态的结合力已经远高于纯Ni-P镀层，并且分散的SiC颗粒有阻止镀层受载发生进一步变形受损的能力。对于Ni-P-PTFE复合镀层，主要通过正交试验设计，得到优化的工艺方案为：PTFE乳液：5ml/L，FC-4：0.4g/L，pH值为6，温度为86℃，间歇搅拌。关键词：化学复合镀层，

2、工艺，热处理，正交实验STUDYONELECTROLESSCOMPOSITECOATINGSABSTRACTElectrolessNickelPlating(ENP)havebeenwidelyappliedinactualproductionwithitsadvantagessuchassimpleprocessing,low-cost,uniformthickenessandlarge-areaplating.However,withthetechnologicaldevelopmentandactualproduction’sneeds,itwa

3、sgraduallydevelopedcompositecoatingswithspecificfunctions,ElectrolessNickelCompositePlating(ENCP)couldsupplementedbythecompoundcharacteristicsasmaintainingnatureoftheoriginalmetalcoating,attainstrengthenedandmodifiedcoatings;thismakesthefunctionsofcompositecoatingswithconsiderab

4、lefreedom.ThispaperdiscussedtwodifferentElectrolessnickelcompositeplatings:Ni-P-SiCcompositeplatingsandNi-P-PTFEcompositeplatings.SiCparticleswithhighhardnessareembodiedintheNi-Pcoatingsbycompositedeposition.Hardparticledispersionstrengtheninggreatlyenhancesthehardnessandwearres

5、istanceofcompositecoatings.PTFEparticleshavegoodcapabilityofself-lubricatingandaredispersedinthenickel-phosphorusmatix.Whenthesecompoundcoatingsendureabrading,PTFEparticlesexpandthroughitsownlayerrolloutandformalubricatinglayeronthesurfaceofworkpieceafterabradingforawhile.Ithelp

6、sreducethefrictioncoefficientandwearlost.ItwasstudiedtheoptimumconditionsmainlybychangingSiC(2-3µm)concentrationandagitatingmethods,andopticalmicroscopy,SEM,microhardness,Scratchfrictionandweardevicesareusedtocharacterizethecompositecoatingmicrostructureandmechanicalproperties.D

7、ifferentmechanicalpropertiesofthecoatingsunderconditionswerediscussed.TestresultsshowedthatwithincreasingSiCparticules’concentrationinthesolution,theseparticles’contentincoatingsfirstlyincreasedthendropped;Whentheconcentrationreached8g/L,SiCcontentinthecoatingmetmaximumvalue,and

8、thecompositecoatingshavehardnessandwearresistan