Preparation And Study Tribological Characteristics Of Novel Anti-wear Additives

Lubricants which has been widely used in industrial production and daily life, has an important role in reducing energy consumption and mechanical wear, corrosion, cooling, etc.It is an essential component in modern industry and economic development. In recent years, with the development of modern industry and people’s environmental protection awareness, the original lubricant meet a variety of working conditions, but is no longer suitable for the environmental protection requirements. Therefore, there is urgent need for a lubricant which not only meet the requirements of industrial production, but also in line with the requirements of environmental protection. lubricating oil consists of base oil and additives, therefore the environmentally friendly lubricant requirements green base oil and additives. Rapeseed oil have advantages such as non-toxic, biodegradable, good viscosity-temperature performance, etc., so it can be used as green lubricant base oil. Boric acid esters and nanoparticle additives not only has good anti-wear properties, but aslo environmental protection, they have become a new green lubricant additives.In this thesis, the physical characteristics and tribological properties of the two new additives containing heterocyclic borate and oil-soluble graphene oxide were investigated Rapeseed oil was used as the base oil to investigate the solubility, high temperature stability, corrosion resistance and other physical properties of additives, and a four-ball friction tester was used to investigated the anti-wear and extreme pressure performance of additives.Studies have shown that nitrogen-containing heterocyclic borate have good oil solubility, thermal stability and corrosion resistance. The test results of tribological performance show that the two additives can reduce friction, improve extreme pressure property, and enhance the performance of lubricating oils. XPS analysis showed that the two additives will be by the way of physical adsorption and chemical reactions during the friction, physical adsorption will form a stable continuous protective film in the friction surface, chemical reactions with the metal having FeS, FeO, B2O3, etc. tribochemical film material, to further improve the anti-friction wear performance. The scanning electron microscope (SEM) was used to observe the friction surface morphology of balland understand the wear of friction surfaces. The X-ray photoelectron spectroscopy (XPS) was used to analyze the element of the friction surface.Studies have shown that Oil-soluble graphene oxide can be uniformly distributed in rapeseed oil without precipitation phenomenon. The reason of additive has good tribological properties are as follows:the first reason is flakes oil-soluble nano graphene can deposited on the friction surface, form a physical adsorption film to avoid direct contact with the friction surface; the second reason is the additives have chemical reaction with the metal surface friction chemical, form a protective oxide film, the film structure comprising an organic form of iron and carbon formed metal complex, with good tribological effects.