Comparative study on corrosion resistance and lubrication function of lithium complex grease and polyurea grease

Friction

Xiaoqiang Fan¹  Xiangyuan Ye²  Pengfei Zhang³  Guanlin Ren³  Wen Li³  Minhao Zhu³ 

[1] Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University;Shaanxi Key Laboratory of Phytochemistry, College of Chemistry & Chemical Engineering, Baoji University of Arts and Sciences;Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University;

关键词: lithium complex grease;    polyurea grease;    salt-spray resistance;    tribological property;   

DOI  :  10.1007/s40544-019-0325-z

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown