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.

中文翻译：

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探索混合锂复合皂和磺酸钙的协同作用，以达到良好的润滑和防腐性能

增稠剂对润滑脂的性能起着重要作用，包括流变性，化学和热稳定性，胶体和机械稳定性等。在此，通过以1：2、2：1和1：1的摩尔比调节锂复合皂和磺酸钙并增稠聚α-烯烃（PAO40），合成锂复合钙磺酸盐（L / C）润滑脂。用锂复合脂和磺酸钙脂作了比较，详细评价了其理化性能，耐蚀性和摩擦学性能。结果表明，由于独特的磺酸钙反胶束和密封功能，所制备的L / C润滑脂对低碳钢具有良好的耐腐蚀性。由于增稠剂的组分/结构及其对基础油的敏感性，调节锂复合皂和磺酸钙的摩尔比可以实现润滑脂理化和摩擦学性能的可调节性。配方L / C = 1：2的润滑脂具有最佳润滑功能，这不仅取决于增稠剂的成分和结构，还取决于由Fe组成的润滑脂膜和摩擦化学反应膜的协同润滑₂ O ₃，FeO（OH），CaO，CaCO ₃和LiOH。

图形概要

所制备的润滑脂，摩擦学机构的示意图一个摩擦的开始，b摩擦一段时间之后。