电沉积镍基%2f铜基纳米复合镀层制备、组织结构和性能的研究.pdf

电沉积镍基/铜基纳米复合镀层制备、组织结构与性能研究摘要纳米复合电沉积是一种新兴的复合表面技术,通过将纳米粒子引入金属镀液中形成的纳米复合镀层,显示出优越的机械性能、电催化性能、耐腐蚀性能等,正逐渐成为研究的热点。本文介绍了纳米复合镀层的制造技术和研究现状,并探讨了Ni—w.(si,N。/A1203)和Cu.(A1203/si02)纳米复合镀层的配方和工艺条件,考察了纳米微粒的添加量、分散剂、分散方法、PH值、电流密度、施镀条件等因素对施镀工艺和镀层外观的影响。并在此基础上,阐述了纳米颗粒与金属共沉积的机理。在实验中,测试了纳米复合镀层的硬度,研究了多种分散方法对纳米复合镀层中的纳米颗粒分散性的作用。同时用x光电子能谱分析、x射线衍射、扫描电镜和透射电镜等手段研究表征了镍基/铜基纳米复合镀层的组成与结构;并通过腐蚀失重、测定阳极极化曲线和电化学阻抗谱等方法研究了纳米复合镀层的性能。随电流密度的增大,Ni—w-si3N4纳米复合镀层中纳米si3N4的含量不断提高,当电流密度提高到20A/dm2时,%,镀层质量较好。电流密度增大,Ni—,当温度大于到75℃后,增长速度趋缓;沉积时间增加,Cu.(A1203/si02) 纳米复合镀层中微粒复合量也不断增加。结果表明:超声波分散方法可以使纳米粒子充分分散,分布较均匀而且镀层复合量高,从而使镀层表现出较好的组织及性能。%Nacl溶液中, Ni—。关键词: 电沉积纳米颗粒复合镀复合镀层组织结构耐蚀性电化学阻抗谱 Study on thePreparation,MicrostructHre and Perfornlance of Ni/Cu—based posite Coatings by Electrodeposition posite electrodeposition with nano—particles is a deVeloping surface technology. posite coating is showing more and mOre excellent performance,such as mechanical performance,catalytic performance,corrosive protective performancd a11d so ofthishasbought awide range investigation on it. In this paper, the manufhcture techn0109y and current study of posite coatings were introduced. position and technologies of posite coating Ni-’辅,-nano(Si3N4/A1203)and Cu—nano (A1203/Si02) were studied. The effects of main fhctors (adding quantity of nano—Si3N4,disperse methods,current density,dispersing agent)on thequaIity of Ni一、posite coatings and deposition velocity were ofit,codeposition mechanism Ofnano—particles with metal ions was imroduced. Many dispersjOn methods on the nanometer particle for posite coatings have been studied inthispape r'At thesame time,the microstructures ponents of posite coating Ni一、^Lnano(si3N4,A1203)and cu·nano (A1203/Si02)were characterized by EDS、XRD and SEM as well as TEM performance was studied bymeasuring microhardness,weight Joss method,anodic polarization curVe and EIS. The resuIts showed thatthewt%of then