Tribological behavior of a novel organic molybdenum containing dimercaptothiadiazole as a multifunctional additive in biodegradable base oil

Organic molybdenum friction modifier is an indispensable lubricating material owing to its remarkable tribological behavior, which has been widely used in various fields. Here, a feasible method is provided for the synthesis of thiadiazole organic molybdenum as a multifunctional lubricant additive in the trimethylolpropane trioleate biodegradable base oil. Results show that the coefficient of friction and the wear scar diameter are significantly decreased by-39% and-42%, respectively. Moreover, its extreme pressure performance is also improved by more than 50%. The XANES results show that the functional group of the thiadiazole and molybdate in the additive molecule will form a tribofilm rich in sulfate and molybdate to enhance the properties of friction-reducing, anti-wear and load-bearing capacity of the based oil. CO 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

Organic molybdenum friction modifier plays a crucial role in lubrication, and the synthesized thiadiazole organic molybdenum as an additive has shown significant effects in reducing friction coefficient and wear scar diameter, as well as improving extreme pressure performance. The functional groups in the additive molecule can form a friction film rich in sulfate and molybdate to enhance the friction-reducing, anti-wear, and load-bearing capacity of the base oil.