Fabrication of high-performance nickel/graphene oxide composite coatings using ultrasonic-assisted electrodeposition.
Fabrication of high-performance nickel/graphene oxide composite coatings using ultrasonic-assisted electrodeposition.
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DOI：
10.1016/j.ultsonch.2019.104858
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发表时间：
2019-11
影响因子：
8.4
通讯作者：
Honggang Zhang;N. Zhang;F. Fang
中科院分区：
文献类型：
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作者：
Honggang Zhang;N. Zhang;F. Fang
采用超声辅助电沉积技术制备了高硬度、低摩擦系数、高耐磨性的镍/氧化石墨烯复合镀层。本文系统研究了超声功率和氧化石墨烯浓度对电沉积镍/氧化石墨烯复合镀层力学性能和摩擦学性能的影响。X射线衍射（XRD）分析表明，随着超声功率（0-50 W，40 KHz，方波）和氧化石墨烯浓度（0.1-0.4 g/L）的增加，镍的晶粒尺寸减小。通过扫描电子显微镜（SEM）观察的复合涂层的表面和横截面的形貌证实了氧化石墨烯颗粒在镍基体中的存在。显微硬度测试结果表明，当氧化石墨烯浓度为0.1 g/L时，采用50 W超声辅助电沉积，镀层硬度比纯镍镀层提高了1.8倍。当超声功率为50 W时，氧化石墨烯质量浓度为0.4 g/L时，镀层的硬度比纯镍镀层提高了4.4倍。随着超声功率和氧化石墨烯浓度的增加，摩擦系数逐渐减小，其中氧化石墨烯浓度的影响更为重要。
Ultrasonic-assisted electrodeposition was used to fabricate the nickel/graphene oxide composite coatings with high hardness, low friction coefficient, and high wear resistance. In the present study, the effects of ultrasonic power and concentration of graphene oxide on the mechanical and tribological properties of the electrodeposited nickel/graphene oxide composite coatings were systematically studied. X-ray diffraction (XRD) analyses showed that the crystallite size of the nickel decreased with an increase of ultrasonic power (0–50 W, 40 KHz, square wave) and concentration of graphene oxide (0.1–0.4 g/L). Morphologies of the surface and cross-section of the composite coatings observed by Scanning Electron Microscopy (SEM) confirmed the existence of graphene oxide particles in the nickel matrix. The results from microhardness measurement demonstrated that the hardness was increased by 1.8 times using 50 W ultrasonic-assisted electrodeposition with the fixed concentration of graphene oxide (0.1 g/L), compared to the pure nickel coating. The hardness was increased by 4.4 times for the 0.4 g/L graphene oxide with the optimized ultrasonic power of 50 W in comparison to the pure nickel coating. Meanwhile, the friction coefficient decreased gradually with an increase in ultrasonic power and concentration of graphene oxide, respectively, where the effect of the concentration of graphene oxide played a more important role.