Abstract
A middle base number sulphonate-modified nano calcium carbonate (SMC) with an average size of 35 nm was synthesized, and its tribological and antioxidation synergistic behaviors with ashless antioxidant N-phenyl-α-naphthylamine (T531) in hydrogenated oil (5Cst) were evaluated. The results demonstrate that adding this synethesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load. The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive. The chemical composition of the rubbing surface which formed on the boundary film was analyzed by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on. Its ability to increase oxidation free energy of base oil is the main reason for increasing its antioxidant collaboration property with ashless antioxidant T531.
Highlights
Sulphonates are mainly used as metal detergents in lubricating oil, and they are mainly formed with calcium sulphonate, magnesium sulphonate, barium sulphonate, etc
Nanoparticles used as lubricant additive was considered an effective approach to upgrade lubricants due to their small size and physicochemical properties, which have been thoroughly investigated during the past decades [5,7]
These nanoparticles mainly focused on nano metal and metallic oxide, such as copper, nano calcium carbonate etc. [8], which modified with surfactant to improve solubility in base oil, and have poor oil-soluble stability
Summary
Sulphonates are mainly used as metal detergents in lubricating oil, and they are mainly formed with calcium sulphonate, magnesium sulphonate, barium sulphonate, etc. Some sulphonates (mainly sodium and calcium salts) have been found possess very good extreme pressure property in metal working fluid, and possess very good solubility of nano carbonate particle in gel since the 1980’s Such an active film [3] that contains oxides and sulphides which come from additive the lubricating surface can prevent the contact with the substrate directly and plays an important role in extreme pressure behaviors. The resulting stringent demand for two or more additives mix According to this basis, adding oil-soluble metal salt into lubricant [3] is an effective way to improve the thermal oxidation stability at high temperature. All chemical reagents (AP grade) are purchased from Shanghai Shen Bo Chemical co., LTD of China, the benzenesulphonic acid and HVI 150 base oil are made by Daqing Refinery Factory of China
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