氧化石墨烯浓度对镍基/石墨烯复合材料摩擦性能、耐蚀性能及显微硬度的影响

Effect of Graphene Oxide Concentration in Nickel Electrolyte on Mechanical and Corrosion Performance of Nickel-Graphene Composite Coatings

将氧化石墨烯置于镀镍液中,采用直流电沉积技术制备了镍基/石墨烯复合材料,并用拉曼光谱、X射线衍射分析了其结构。结果表明,电沉积过程中氧化石墨烯已经被还原为石墨烯,添加石墨烯后复合材料的择优生长取向从(200)变为了(111)。当氧化石墨烯的浓度在0.02~0.04 g/L范围时,复合材料的显微硬度随着浓度增加显著提高。石墨烯的引入可提高镍基/石墨烯复合材料的耐磨性;随着氧化石墨烯浓度的提高,镍基/石墨烯复合材料的耐磨性提高。当电流密度为1.8 A/dm2时,镍基/石墨烯复合材料表现出了最好的耐蚀性。

Graphene/nickel composite coatings on copper were prepared by direct current electrodeposition in a nickel sulfate solution with graphene oxide（GO）. Raman spectra demonstrated that the graphene oxide had been reduced to graphene during the electrodeposition process. X-ray diffraction patterns showed that the preferred orientation of the deposited nickel changed from（200） for the deposited simple Ni to（111） for that coupled with graphene; the hardness of the composites was significant enhanced due to the incorporation of graphene, and the hardness reached a maximum when the nickel electrolyte with graphene oxide in a range of 0.02-0.04 g/L. It was also demonstrated that the presence of graphene could enhance the wear resistance of the deposited composites. Besides, the composite deposited by a current density 1.8 A/dm2 showed the best corrosion resistance.