Comparative study on corrosion resistance and lubrication function of lithium complex grease and polyurea grease
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
Comparative study on corrosion resistance and lubrication function of lithium complex grease and polyurea grease Guanlin REN1, Pengfei ZHANG1, Xiangyuan YE2, Wen LI1, Xiaoqiang FAN3,*, Minhao ZHU1,3 1
Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Shaanxi Key Laboratory of Phytochemistry, College of Chemistry & Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China
3
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Received: 02 July 2019 / Revised: 06 August 2019 / Accepted: 03 September 2019
© The author(s) 2019. 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. Keywords: lithium complex grease; polyurea grease; salt-spray resistance; tribological property
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Introduction
In recent years, increasing attention has been paid to offshore engineering equipments, because their operating conditions remain hot and humid air, seawater splashing, and salt-spray corrosion, causing serious corrosion and wear to metal components [1–3]. These causes of damage are the main threats to the performance and service life of marine engineering equipments [4]. Salt-spray corrosion causes serious damage, even failure, to mechanical parts in the ocean atmosphere [5, 6]. Therefore, it is of great significance to take effective protection to ensure the reliability and security of offshore engineering equipments.
Lubricating grease could serve as corrosion resistant material owing to its inherent sealing function [7]. The higher consistency differed from liquid lubricant, preventing contaminants from entering the contact surface, possibly displaying good corr
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