氧化石墨烯对纳米金属陶瓷复合镀层组织性能影响  

Effect of Graphene Oxide on Microstructure and Properties of Nano-cermet Composite Coatings

作　　者：李智[1] 刘崇宇 葛毓立[1] 宋万彤 胡德枫 LI Zhi;LIU Chong-yu;GE Yu-li;SONG Wan-tong;HU De-feng(College of Mechanical Engineering,Dalian University,Liaoning Dalian 116622,China;College of Physical Science and Technology,Dalian University,Liaoning Dalian 116622,China)

机构地区：[1]大连大学机械工程学院,辽宁大连116622 [2]大连大学物理科学与技术学院,辽宁大连116622

出　　处：《表面技术》2023年第10期394-402,421,共10页Surface Technology

基　　金：国防科技重点实验室基金项目(6142005180302)。

摘　　要：目的 提高纳米金属陶瓷复合镀层硬度、耐磨性,以及耐蚀性。方法 在镀液中添加了氧化石墨烯(GO),在合金的基体上制备了Ni-TiN-GO的复合镀层,并对镀层组织结构、成分、显微硬度、耐磨性和耐蚀性进行表征及分析,探究GO的添加量对其组织性能的影响,确定最适宜的GO添加量。结果 最适宜GO含量为0.3 g/L,所得镀层表面平整致密,与基体结合良好,厚度为8.64μm。晶面表现为双择优取向,晶粒尺寸最小,显微硬度最大,分别为22.8 nm和1 529.1HV。摩擦磨损测试表明摩擦因数为0.8,主要以磨粒磨损为主,具有良好耐磨性能。Ni-TiN-0.3g/LGO复合镀层自腐蚀电流密度较基体和Ni-TiN镀层下降1个数量级,在经过96 h的盐雾试验后,镀层未见开裂,只附着少量腐蚀产物,表现出良好的耐蚀性。结论 当GO的添加量为0.3 g/L时镀层表面最为致密,缺陷减少,并且通过其较大的比表面积可阻碍腐蚀离子通过,进而提高镀层耐蚀性。GO通过在镀液中与Ni^(2+)结合形成复合物共沉积到孔隙缺陷处,同时GO弥散分布于镀层,提供了大量的形核位点,镀层晶粒尺寸下降,因此镀层硬度提高,并且由于GO具有一定自润滑能力,镀层的耐磨性提高。The work aims to improve the hardness,wear resistance and corrosion resistance of the nano metal-ceramic composite coatings.The method was to prepare Ni-TiN-GO composite layers by adding different contents of graphene oxide(GO) to the plating solution and using nanoelectrodeposition on the surface of alloy steel,and characterize and analyze the structure,composition,microhardness,wear resistance and corrosion resistance of the plated layer,to investigate the effect of GO content on its tissue properties and determine the most suitable GO content.The result showed that the most suitable GO content was 0.3 g/L,and the surface of the resulting plating was flat and dense,with good bonding with the substrate,and the thickness was 8.64 μm;The crystalline surface exhibited double selective orientation with the smallest grain size and the largest micro hardness at 22.8 nm and 1 529.1HV respectively,312.6% increase in hardness compared with the substrate;GO was diffusely distributed in the plating layer,providing numerous nucleation sites and decreasing the grain size of the plating layer.GO could be diffusely distributed in the plating layer to refine the grains.Due to its excellent conductive properties,the deposition rate was increased,resulting in fewer defects,dense plating,and a friction coefficient of 0.8,which significantly enhanced the wear resistance of the plating layer.Mainly based on abrasive wear,with good wear resistance,GO was dispersed as a solid lubricant on the surface of the plating,which prevented direct contact between the friction subsets and made the wear marks significantly weaker.Due to the small size of GO,it could fill in the plating pores,effectively reduce defects,and achieve dense plating.In addition,its larger specific surface area could effectively prevent corrosion ions from entering.The Ni-TiN-0.3g/LGO composite plating self-corrosion current density decreased by an order of magnitude compared with the base and Ni-TiN plating,the corrosion potential of the composite coating was the most

关 键 词：氧化石墨烯 纳米电沉积 金属陶瓷复合层 组织性能 

分 类 号：TQ153[化学工程—电化学工业]