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Abstract
In this study, lithium complex grease (LCG) and polyurea grease (PUG) were synthesized using mineral oil (500SN) and polyalphaolefin (PAO40) as base oil, adsorbed onto lithium complex soap and polyurea as thickeners, respectively. The effects of grease formulation (thickener and base oil with different amounts (80, 85, and 90 wt%) on the corrosion resistance and lubrication function were investigated in detail. The results have verified that the as-prepared greases have good anti-corrosion ability, ascribed to good salt-spray resistance and sealing function. Furthermore, the increase in the amount of base oil reduces the friction of the contact interface to some extent, whereas the wear resistance of these greases is not consistent with the friction reduction, because the thickener has a significant influence on the tribological property of greases, especially load-carrying capacity. PUG displays better physicochemical performance and lubrication function than LCG under the same conditions, mainly depending on the component/structure of polyurea thickener. The polyurea grease with 90 wt% PAO displays the best wear resistance owing to the synergistic lubrication of grease-film and tribochemical film, composed of Fe2O3, FeO(OH), and nitrogen oxide.
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Details
1 Southwest Jiaotong University, Tribology Research Institute, School of Mechanical Engineering, Chengdu, China (GRID:grid.263901.f) (ISNI:0000 0004 1791 7667)
2 Baoji University of Arts and Sciences, Shaanxi Key Laboratory of Phytochemistry, College of Chemistry & Chemical Engineering, Baoji, China (GRID:grid.411514.4) (ISNI:0000 0001 0407 5147)
3 Southwest Jiaotong University, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Chengdu, China (GRID:grid.263901.f) (ISNI:0000 0004 1791 7667)
4 Southwest Jiaotong University, Tribology Research Institute, School of Mechanical Engineering, Chengdu, China (GRID:grid.263901.f) (ISNI:0000 0004 1791 7667); Southwest Jiaotong University, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Chengdu, China (GRID:grid.263901.f) (ISNI:0000 0004 1791 7667)