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热处理温度和时间对镍-磷合金镀层硬度的影响毕业论文.doc

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热处理温度和时间对镍-磷合金镀层硬度的影响毕业论文.doc

本科毕业论文(设计)论文题目热处理温度和时间对镍磷合金镀层硬度的影响1学生姓名所在院系机电学院所学专业机电技术教育导师姓名完成时间摘要本文论述了NiP合金化学镀的反应机理,采用酸性溶液化学镀镍磷合金,研究了热处理温度和时间对镀层显微硬度的影响。通过在镀液中采用络合剂、稳定剂、促进剂等成分,得到了不同磷含量非晶态NiP镀层。运用显微硬度计、扫描电镜等现代分析工具,系统地测试和分析了NiP镀层的成分、组织结构及不同磷含量、不同热处理状态的化学镀NiP合金表面镀层,在50g载荷下的显微硬度。并通过均匀设计法对所测硬度进行优化。优化结果表明在446℃下热处理4.5h,显微硬度高达1066HV。关键词化学镀镍,磷含量,热处理,显微硬度InfluenceofTemperatureandTimeontheMicrohardnessofelectrolessplatingNiPCoating(1)AbstractInthispaper,thereactionmechanismsofNiPalloyelectrolessplatinghavebeenexpounded,wasplatedbyprocessofacidicsolution.Temperatureandtimeinfluenceofheattreatmentonmicrohardnessofthecoatingwasstudied.Intheelectrolesssolution,thecompositecomplexingagent,stabilizerandaccelerantareapplied,andtheconcentrationofphosphorusamorphousNiPcoatingisgained.Thecomposition,microstructure,microhardnesspropertyofNiPelectrolessplatinghavebeenstudiedwiththehelpofmodernanalyticalinstrument,suchasthescanelectronmicroscope,thephotoelectronspectroscopy,andsoon.TheelectrolessNiPcoatingshardnesswasmeasuredbyhardnesstesterwithamax,loadingcapacityof50g,andthecoatingswithvariousthicknesshadbeentreatedbydifferentheattreatments.Itisindicatedfromtheexperimentthatmicrohardnessareobviouslyimprovedafterheatedat446℃for4.5h,aswellasthemicrohardnessis1066HV.KeywordselectrolessplatingNi,concentrationofphosphorus,heat–treatment,microhardness目录1绪论............................................................................................................................11.1化学镀镍技术概况..............................................................................................21.2化学镀镍的特点..................................................................................................21.3化学镀NIP合金机理........................................................................................22实验材料和研究方法................................................................................................32.1试验材料和实验装置..........................................................................................32.2基本工艺流程......................................................................................................32.3试样前处理..........................................................................................................32.3.1预磨试样.......................................................................................................32.3.2清洗...............................................................................................................42.3.3除油...............................................................................................................42.3.4除锈...............................................................................................................42.4镀液成分及配制方法..........................................................................................42.5施镀......................................................................................................................62.6镀件后处理..........................................................................................................62.7镀层性能测试方法..............................................................................................72.7.1镀层显微硬度测试.......................................................................................72.7.2镀层的热处理测试.......................................................................................73试验结果及分析........................................................................................................73.1化学工艺因素的影响..........................................................................................73.1.1温度的影响...................................................................................................73.1.2pH值的影响...............................................................................................73.1.3其他因素的影响...........................................................................................83.2磷含量对镀层显微硬度的影响..........................................................................83.3热处理对镀层显微硬度的影响........................................................................113.3.1热处理温度对镀层显微硬度的影响.........................................................113.3.2热处理时间对镀层显微硬度的影响.........................................................134结论..........................................................................................................................19谢辞..............................................................................................................................19参考文献......................................................................................................................20

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