Tribological Properties of Multi-Walled Carbon Nanotube-Cr and Graphene Oxide-Cr Composite Coating
Tribological Properties of Multi-Walled Carbon Nanotube-Cr and Graphene Oxide-Cr Composite Coating
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DOI：
10.1115/1.4043066
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发表时间：
2019-05-01
影响因子：
2.5
通讯作者：
Yi, Wangmin
中科院分区：
文献类型：
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作者：
Chen, Bo;Liang, Shenghu;Yi, Wangmin
铬基涂层被广泛应用于各种表面以增强减摩耐磨性。在此，通过超声氧化处理获得氧化的多壁碳纳米管（MWCNT）和氧化石墨烯纳米片（GOS）的稳定的水性分散体。然后，采用直流电化学共沉积工艺，在420不锈钢基体上分别制备了MWCNT-Cr和GOS-Cr复合镀层。以纯Cr涂层为基准，对比研究了MWCNT-Cr和GOS-Cr复合涂层的形貌、结构、硬度和摩擦学性能。在最佳电流密度和温度下，MWCNT-Cr和GOSCr复合镀层的减摩性能得到改善。多壁碳纳米管和GOS在涂层中的均匀嵌入提高了涂层的硬度和润滑性，从而提高了MWCNT-Cr和GOS-Cr复合涂层的耐磨性。这项研究表明，引入氧化的多壁碳纳米管和GOS具有良好的分散性，可以提高耐磨性和摩擦减少纯铬涂层由于其优异的分散性，机械性能和润滑性能。
Chromium (Cr)-based coatings have been widely used to strengthen the friction reduction and wear resistance on various kinds of surface. Here, the stable aqueous dispersion of oxidized multi-walled carbon nanotube (MWCNT) and graphene oxide nanosheets (GOS) was obtained by ultrasonic oxidation treatment. Then, MWCNT-Cr and GOS-Cr composite coatings were prepared using the direct current electrochemical co-deposition process on 420 stainless steel in the electrolyte with the addition of MWCNT and GOS under different current density and temperature. The morphology, structure, hardness and tribological properties of MWCNT-Cr and GOS-Cr composite coating are comparatively studied using pure Cr coating as a baseline. The friction reduction performance of MWCNT-Cr and GOSCr composite coatings was improved at optimum current density and temperature. The antiwear properties of MWCNT-Cr and GOS-Cr composite coatings were enhanced by uniform embedment of MWCNT and GOS in coatings increasing the hardness and lubricity. This study suggests that the introduction of oxidized MWCNT and GOS with good dispersion could enhance the wear resistance and friction reduction of pure Cr coating due to their excellent dispersion, mechanical, and lubricant properties.