Probing the Synergy of Blended Lithium Complex Soap and Calcium Sulfonate Towards Good Lubrication and Anti-Corrosion Pe
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ORIGINAL PAPER
Probing the Synergy of Blended Lithium Complex Soap and Calcium Sulfonate Towards Good Lubrication and Anti‑Corrosion Performance Guanlin Ren1 · Pengfei Zhang1 · Wen Li1,2 · Xiaoqiang Fan2 · Lin Zhang2 · Hao Li1,2 · Minhao Zhu1,2 Received: 19 June 2020 / Accepted: 4 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Thickener plays a significant role on the performance of grease, including rheological property, chemical and thermal stability, colloidal and mechanical stability, and so forth. Here, lithium complex-calcium sulfonate (L/C) greases were synthesized via regulating lithium complex soap and calcium sulfonate in the molar ratio of 1:2, 2:1 and 1:1, along with thickening the polyalphaolefin (PAO40). The physicochemical properties, corrosion resistance and tribological performance were evaluated in detail, with lithium complex grease and calcium sulfonate grease as a comparison. The results show that the as-prepared L/C greases have good corrosion resistance for low-carbon steel due to unique reversed micelles of calcium sulfonate and sealing function. The regulation of lithium complex soap and calcium sulfonate in different molar ratios achieves the considerable adjustability of grease’s physicochemical and tribological properties due to the component/structure of thickener and its sensitivity to base oil. The grease with formulation of L/C = 1:2 gives the best lubrication function depending on not only the thickener’s component and structure, but also the synergistic lubrication of grease-film and tribo-chemical reaction film composed of Fe2O3, FeO(OH), CaO, CaCO3 and LiOH. Graphical Abstract The schematic diagram of tribological mechanism of the as-prepared grease, a the start of the friction, b the friction after a period of time.
Keywords Calcium sulfonate · Lithium complex soap · Corrosion resistance · Tribological performance Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11249-020-01338-1) contains supplementary material, which is available to authorized users. Extended author information available on the last page of the article
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1 Introduction Grease is an indispensable lubricant for long-term safe and reliable operation of mechanical equipment due to its excellent friction-reducing and anti-wear ability [1]. With the development of science and technology, the operating environment of mechanical equipment made higher requirements for grease. For example, the modern equipment always suffers from high/low temperature, salt spray, acid/alkali atmosphere, and so forth [2], which gives rise to the severe wear and corrosion. Lubricating grease is very suitable for corrosion-resistant and anti-wear applications due to its excellent sealing and lubricating function [3]. The high consistency which differed from lubricating oil makes it adhere to the mechanical parts without leaking, avoiding the impurities into friction surfaces [4]. But the corrosi
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