多羟基化改性石墨烯水基润滑添加剂的摩擦学特性  

Tribological Performance of Hydroxylated Graphene Oxide as Water-based Lubricant Additives

作　　者：项宪政 龚民[1] 张刚强[1] 徐勇 任天辉[1] XIANG Xianzheng;GONG Min;ZHANG Gangqiang;XU Yong;REN Tianhui(School of chemistry and chemical engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《润滑与密封》2018年第9期39-46,共8页Lubrication Engineering

摘　　要：氧化石墨烯(GO)边缘处的羧基为酸性基团,在摩擦过程中会造成金属摩擦副的腐蚀磨损。为减弱GO上羧基的腐蚀磨损,利用甘油与GO反应制备一种多羟基化改性氧化石墨烯(GOOH);利用原子力显微镜(AFM)与扫描电子显微镜(SEM)对改性前后GO的形貌进行观测,利用傅里叶红外光谱仪(FT-IR)对其进行结构表征,并评价其在水中的稳定性和腐蚀性;用四球摩擦磨损试验机考察GO和GOOH作为水基润滑添加剂的减摩抗磨性能,用SEM-EDS分析试球表面磨斑形貌及摩擦膜的化学成分组成。结果表明:GOOH能在水中稳定分散,且相比于GO,GOOH对钢球的腐蚀性更弱,摩擦因数及磨斑直径更小,磨斑形状更规则,犁沟更浅。EDS测试结果表明,使用GOOH添加剂的钢球磨损表面碳元素含量较GO更多,说明其能更好地吸附到摩擦副表面起到减摩抗磨的作用。The carboxyl group at the edge of graphene oxide(GO)is an acidic group,which will cause corrosive wear of the metal friction pair during the friction process.In order to reduce the corrosive wear of the carboxyl group,GO and glycerol were introduced to synthesize a type of hydroxylated graphene oxide additives(GOOH)used in water-based lubricants.Atomic force microscopy(AFM)and scanning electron microscope(SEM)were employed to observe the surface topography of GO before and after modification.Fourier Transform infrared spectroscopy(FTIR)were used to characterize the structure of synthesized additive,and the stability test and copper corrosion test of synthesized additive were also carried out.The tribological properties of GO and GOOH as additives in water-base lubricants were evaluated using a four ball tester.The morphologies of worn surfaces were investigated by scanning electron microscopy(SEM)and the element composition on the worn surface were studied by energy dispersive spectroscopy(EDS).The results indicate that the synthesized GOOH is as stable as GO in water,but the corrosivity of GOOH is weaker than that of GO.SEM analysis results show that the worn surfaces are more regular and smooth by adding GOOH,and the EDS analysis results indicate that the worn surface has more carbon by adding GOOH than adding GO,showing that GOOH can better adsorb on the surface of friction pairs and play a role of anti-wear and friction-reducing.

关 键 词：羟基化改性 氧化石墨烯 水基润滑油添加剂 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]