The Effect of Lubricity of Calcium Sulfonate on ZnDTP and MoDTC

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-05-06 DOI:10.1007/s11249-024-01860-6

Yumi Hayashi, Kaisei Sato, Shinya Sasaki

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Abstract

Reduction of friction and wear by lubrication is necessary to improve the efficiency and prolong the lifespan of industrial machinery. However, several aspects regarding the lubrication effects in additive-combined oil are still unresolved. This study focuses on the effects of combining zinc dialkyldithiophosphate (ZnDTP), molybdenum dithiocarbamate (MoDTC), and Ca sulfonate on the frictional behavior of poly-α-olefin 4 (PAO4) lubricant oils. Ball-on-disk friction tests demonstrated that the exclusive addition of high-base Ca sulfonate solution reduced friction and wear of the lubricating oil. When combined with ZnDTP and MoDTC, the friction coefficients of PAO with high-base and low-base Ca sulfonate are affected by competitive reactions on the sliding surface. Quartz crystal microbalance with dissipation monitoring measurements suggests that high-base Ca sulfonate forms a stronger adsorption film than low-base Ca sulfonate. Atomic force microscope observations confirmed that the addition of low-base Ca sulfonate reduced friction and wear, whereas high-base Ca sulfonate induced competitive reactions with ZnDTP and MoDTC. This study provides valuable insights into the effects of the combination of additives on the lubricity of PAO and their impact on friction and wear characteristics, which are valuable for the design of suitable lubricants for industrial machinery.

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磺酸钙对 ZnDTP 和 MoDTC 润滑性的影响

要提高工业机械的效率并延长其使用寿命，就必须通过润滑来减少摩擦和磨损。然而，有关添加剂复合油润滑效果的几个方面仍未得到解决。本研究主要探讨了二烷基二硫代磷酸锌（ZnDTP）、二硫代氨基甲酸钼（MoDTC）和磺酸钙复合添加剂对聚-α-烯烃 4（PAO4）润滑油摩擦行为的影响。球盘摩擦试验表明，只添加高碱钙磺酸盐溶液可减少润滑油的摩擦和磨损。当与 ZnDTP 和 MoDTC 结合使用时，PAO 与高碱和低碱 Ca 磺酸盐的摩擦系数会受到滑动表面竞争反应的影响。石英晶体微天平与耗散监测测量表明，高碱磺酸钙形成的吸附膜比低碱磺酸钙更强。原子力显微镜观察证实，添加低碱钙磺酸盐可减少摩擦和磨损，而高碱钙磺酸盐则会诱发与 ZnDTP 和 MoDTC 的竞争反应。本研究就添加剂组合对聚酰胺氧化物润滑性的影响及其对摩擦和磨损特性的影响提供了宝贵的见解，这对设计适用于工业机械的润滑油非常有价值。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.